WO2010021899A1 - Formable light weight composites - Google Patents
Formable light weight composites Download PDFInfo
- Publication number
- WO2010021899A1 WO2010021899A1 PCT/US2009/053676 US2009053676W WO2010021899A1 WO 2010021899 A1 WO2010021899 A1 WO 2010021899A1 US 2009053676 W US2009053676 W US 2009053676W WO 2010021899 A1 WO2010021899 A1 WO 2010021899A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metallic
- layer
- composite
- fibers
- polymeric
- Prior art date
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Definitions
- the present invention relates generally to composite materials, and more particularly to sandwich composites that include a fiber-filled polymeric layer and a metallic layer.
- the first approach is a group of all metal sandwiches of thin metal skins and a metallic cellular core. Generally, this group can be welded similarly to a typical weldable metal sheet, since it tends to conduct electricity.
- the second approach typically has two faces of thin metal sheets, separated by a central polymer core layer (which typically are relatively soft viscoelastic materials), and is structured so that it does not conduct electricity across the core layer largely due to the insulative and non-conductive nature of the polymer core layer.
- the polymeric material in any core of this structure may in fact be an insulator.
- sandwich sheet may not be joined by spot welding or require welding conditions (e.g., force, current, cycles, weld time) that may be substantially greater than required for sheet metal having the same thickness.
- welding conditions e.g., force, current, cycles, weld time
- the all metallic sandwich is, therefore, preferred.
- Gissinger et al. (1994, US Patent Number 5,347,099) discloses a method using a specific arrangement of rollers and partially overlapping sandwich sheets as a possible approach to facilitate welding.
- Straza International Patent Application Publication No. WO2007/062061 discloses a method of manufacturing a metal core sandwich structure of a cellular metal core having a shape selected from a group consisting of: octagons, hexagons, pentagons, squares, rectangles, triangles, and circles.
- Clyne et al. 2004, US Patent Number 6,764,772 describe a sandwich material of two metal plates which are affixed to and separated by a fibrous metal core that is generally exposed to air, wherein substantially all of the fibers are inclined at an acute angle to the plates.
- one possible difficulty with those specific cellular metal cores is that the structure is not continuous and thus the face sheet is not supported over the length of the cell. In case of soft face sheets, the thin cell walls may be damaged locally. Their applications thus tend to be limited. It is also a costly structure in that it generally requires the use of expensive materials for resisting corrosion.
- the formability of some metal composites has been found to be inferior to corresponding homogeneous sheet metal of the same thickness.
- the composites have limited drawing ratios and a higher tendency to wrinkle as well as several potential geometrical defects in bending. For some materials, these defects may be the result of large shear deformations in the interlayer because the core material is weak compared to the sheet metal.
- Another possible vulnerability of many composites e.g. sandwiches or laminates
- Wrinkling may be attributed to low yield strength of the core material.
- Aluminum/Polypropylene/Aluminum sandwich sheets as a possible material for automotive usage. Their analysis suggested that certain polypropylene cores may result in sandwich sheets having improved formability.
- a light weight composite comprising a first metallic layer; a polymeric layer disposed on the first layer; and a metallic fiber distributed within the polymeric layer; wherein the polymeric layer includes a polymeric material containing a polymer, the polymer having an elongation at failure of at least about 20% at a tensile strain rate of about 0.1 s '1 as measured according to ASTM D638-08; so that the resulting composite material may be welded (e.g., by an art disclosed resistance welding method), plastically deformed at strain rates greater than about 0.1 s "1 (e.g., so that it can be stamped by an art disclosed metal stamping operation without rupture, delamination, and/or splitting), or both. More preferably, the polymeric layer is sandwiched between the first metallic layer and a second metallic layer.
- the polymer includes a thermoplastic polymer having a glass transition temperature, T 9 , greater than about 80 G C, or a melting temperature, T m , greater than about 80°C;
- the volume ratio of the polymer (e.g., the thermoplastic polymer) to the metallic fiber is greater than about 2.2:1 (preferably greater than about 2.5:1 , and more preferably greater than about 3:1 );
- the composite comprises a second metallic layer, such that the polymeric layer is a core layer interposed between the first metallic layer and the second metallic layer;
- the thermoplastic polymer includes a polymer selected from the group consisting of polypropylene, acetal copolymers, polyamides, polyamide copolymers, polyimides, polyester, polycarbonates, ABS polymer (acrylonitrile/butadiene/styrene copolymer), polystyrenes, ethylene copolymers including at least 80 wt.% ethylene, and
- Another aspect of the invention is directed at a method for manufacturing a composite material, such as a composite material described above, comprising the step of i) depositing the metallic fiber and the polymer for forming the polymeric layer that is bonded on the first metallic layer.
- the polymeric layer is bonded directly to the first metallic layer; the process includes the steps of heat bonding the polymeric layer to the first metallic layer, and applying a pressure to the polymeric layer and the first metallic layer, wherein the heat bonding step includes heating at least a portion of the polymeric layer in contact with the first metallic layer to a temperature greater than T min , wherein T min is the higher of the maximum melting temperature (as measured by differential scanning calorimetry at a heating rate of 10 c C/min) of the one or more polymers of the filled thermoplastic material and the maximum glass transition temperature of the one or more polymer of the filled thermoplastic material; the process further comprises a step of bonding a second metallic layer to the polymeric layer, such that the polymeric layer forms a core layer interposed between the first and second metallic layers; the process further comprises a step of extruding an admixture including the metallic fibers and the one or more polymers in an extruder at
- the first surface of the first metallic layer is free of both a primer, an adhesive material, or both; the metallic fibers are randomly arranged in the thermoplastic material
- the process includes a step of mixing metallic fibers and other filler particles; the process includes a step of chopping strands of metallic fibers to form chopped fibers and feeding the chopped fibers into an extruder, wherein the process is free of a step of placing the chopped fibers in a container; the process further comprises the steps of: adhering a first surface of a second metallic layer to a first surface of a second filled thermoplastic material, contacting a second surface of the filled thermoplastic material that is adhered to the first metallic layer to a second surface of the filled thermoplastic material that is adhered to the second metallic layer, such that the two filled thermoplastic materials are interposed between the first and second metallic layers, and applying pressure to the second surfaces of the filled thermoplastic materials; wherein the second surface of the filled thermoplastic material has a temperature
- Yet another aspect of the invention is directed at a method of forming a composite part comprising the step of stamping a composite material, such as one described above, to form a part.
- This aspect of the invention may be further characterized by one or any combination of the following features: the process further comprising a step of coating at least one exterior surface of the composite material; the composite material is at a temperature less than about 45°C during the stamping step; the stamping step includes a step of drawing at least one portion of the composite material by a draw ratio greater than about 1.5; the composite part is free of wrinkles, dents, and cracks; the composite part has a class A surface; the process further comprises a step of welding the composite material to at least one additional metal containing material, wherein the welding step is selected from group consisting of resistance welding, laser welding, and electron beam welding; the welding step is a resistance welding step; the welding step uses i) a welding current which is lower than the welding current required to weld a monolithic metal sheet of the same material as the first metallic layer and having the same thickness as the composite material to the additional metal containing material, ii) a number of weld cycles which is lower than the number of weld cycles required to we
- the invention is directed at the use a light weight composite materials, such as one described above, in an automotive panel, a truck panel, a bus panel, a container, a panel on a train car, a panel in a jet, a bicycle tube, a motorcycle panel, a trailer panel, a panel on a recreational vehicle, or a panel on a snowmobile.
- a light weight composite materials such as one described above, in an automotive panel, a truck panel, a bus panel, a container, a panel on a train car, a panel in a jet, a bicycle tube, a motorcycle panel, a trailer panel, a panel on a recreational vehicle, or a panel on a snowmobile.
- the invention is directed at a weld joint comprising: a first metallic layer having a first metal; ii) a second metallic layer having a second metal wherein the first metallic layer is in welded contact with the second metallic layer, an area of the welded contact defining a weld zone, and wherein the first metal and the second metal are the same or different; and a metallic ring at least partially encircling the weld zone, disposed between the first and second metallic layers, and attached to the first, second, or both metallic layers in the weld joint, wherein the metallic ring is of a metal that is different from the first metal and the second metal.
- FIG. 1A illustrates a composite material having a polymeric layer and a metallic layer.
- FIG. 1 B illustrates a composite material having a polymeric core layer interposed between two metallic layers.
- FIG. 2 is an example of one possible microstructure in accordance with the present teachings in which a metallic fiber is distributed in a continuous phase of a polymeric matrix.
- FIG. 3A is an illustrative micrograph of a cross-section near a weld between a composite material and a sheet metal.
- FIG. 3B is an illustrative micrograph of a cross-section near a weld between a composite material and a sheet metal.
- FIG. 3C is an illustrative micrograph of a polymeric material including metallic fibers.
- the materials herein employ a filled polymeric material, as will be described, and particularly one that includes a metal fiber phase distributed in a polymeric matrix.
- the composite materials herein employ at least two layers, one of which is the above filled (e.g., fiber-filled) polymeric material (e.g., in a fiber-filled polymeric layer). More particularly, the materials herein are composites that include a sandwich structure, pursuant to which a fiber-filled polymeric layer is sandwiched between two or more other layers.
- the materials herein also contemplate sandwich structure pre-cursors, e.g., a first layer upon which a filled polymeric layer is attached so that the filled polymeric layer has an exposed outer surface.
- a second layer may subsequently be attached to the filled polymeric layer.
- the invention also contemplates feedstock compositions (e.g., in the form of a pellet, a sheet, or otherwise) that include a fiber-filled polymeric material in accordance with the present teachings.
- feedstock compositions e.g., in the form of a pellet, a sheet, or otherwise
- the materials herein exhibit a unique, surprising, and attractive combination of properties, which render the materials suitable for deforming operations (e.g., relatively high strain rate forming operations, such as stamping), welding operations, or both.
- the filled polymeric layer is designed in a manner such that is multiphasic.
- At least one phase (e.g., the filler) provides a conductive flow path, and is such that it is plastically deformable, and may even strain harden when subjected to a stress that induces plastic deformation.
- the polymeric phase is such that it bonds sufficiently to another material (e.g., a metal layer such as a steel sheet) that processing of the composite materials for welding and/or deforming (e.g., forming, such as by stamping), will be free of delamination of the composite.
- the polymeric phase may also be such that it withstands degradation when subjected to coating operations (e.g., when subjected to chemical baths such as electrostatic coating baths, or other baths for imparting corrosion resistance, common in sheet metal coating operations).
- the present invention in its various aspects makes use of unique combinations of materials to derive an attractive composite, and particularly a laminate composite.
- the laminate may be drawn (e.g., deep drawn), welded, or both, in a manner similar to conventional art-disclosed sheet materials, such as sheet metal (e.g., stainless and/or low carbon steel).
- sheet materials such as sheet metal (e.g., stainless and/or low carbon steel).
- the invention makes use of a multi-phase composite material in which the materials are selected and employed so that, as a whole, they impart drawability, weldability, or both.
- a particular preferred combination of materials herein may include two layers that flank a core material, the latter of which is preferably a filled polymeric material.
- the filled polymeric material preferably includes at least one polymer, which polymer may include, consist essentially of, or consist entirely of a thermoplastic polymer, or otherwise has characteristics that render it generally processable as a thermoplastic polymer.
- the filled polymeric material preferably also includes a filler phase, and preferably a phase having a filler that includes, consists essentially of, or consists entirely of a fiber phase, and particularly an elongated fiber phase, such as an elongated metal fiber phase.
- a filler phase preferably a phase having a filler that includes, consists essentially of, or consists entirely of a fiber phase, and particularly an elongated fiber phase, such as an elongated metal fiber phase.
- Such phase may be sufficiently positioned and/or distributed (e.g., wrapped, braided, aligned, entangled, or any combination thereof), and used in sufficient volume that an electrically conductive network across at least portions of the filled polymeric material is realized even if the polymer itself generally is not conductive.
- a particularly preferred elongated fibrous phase may also itself exhibit elongation (either or both individual fibers or the mass as a whole) and possibly strain hardening.
- references to "layers" herein do not necessarily require discrete and separate pieces of material.
- a layered composite may still be within the teachings herein if it includes a single sheet of a material that has been folded over upon itself to define two layers of the material, albeit sharing a common edge, between which is located the filled polymeric material.
- a composite material that is made from layers of adjoining dissimilar materials, which includes at least one layer (e.g., a metal layer such as a metal face layer) and at least one polymeric layer, the composite being formable (e.g., stampable by application of a stress to cause plastic strain (e.g., at a relatively rapid rate) of the material or otherwise capable of being cold-formed on a press machine) into a formed panel.
- the composite material may be a composite laminate containing one metallic layer and one polymeric layer, or it may include one or more other layers.
- the method of forming a sandwich structure may include a step of applying a layer to a precursor to form a sandwich structure, a step of applying a first precursor to a second precursor to form a sandwich structure, or both.
- FIG. 1A An example of a composite laminate 10 having one metallic layer 14 and one polymeric layer 16 is illustrated in FIG. 1A.
- a sandwich 12 may contain a first metallic layer 14, a second metallic layer 14' and a polymeric layer 16 (e.g., a polymeric core layer) interposed between the first and second metallic layers, as illustrated in FIG. 1 B.
- the polymeric layer 16 includes at least one polymer (e.g., a thermoplastic polymer) 18 and a fiber 20.
- the polymeric layer 16 and the first metallic layer 14 may have a common surface 22. As illustrated in FIGs.
- some or all of the fibers may have a length and orientation such that they extend from one surface of the polymeric layer to the opposing surface of the polymeric layer.
- the fraction of the metallic fibers that extend between the two opposing faces of the polymeric layer may be less than 20%, less than 10%, less than 5%, or less than 1%.
- a precursor polymeric layer sheet material i.e., a single layer of the polymeric layer
- the thermoplastic polymer and the fiber e.g., metallic fiber
- Yet another aspect of the invention contemplates a precursor polymeric feedstock material containing the polymer and the fibers.
- a polymeric feedstock material may be formed (e.g., molded or extruded) into the polymeric layer (e.g., into a sheet) either as a single material or by diluting with one or more additional materials (e.g., one or more additional polymers).
- the precursor polymeric feedstock material may include some or all of the components in the polymeric layer of the composite material.
- the precursor polymeric feedstock material includes substantially all of the fiber for the polymeric layer.
- the composites may be deformed (e.g., formed, such as by stamping), attached to another structure (e.g., to steel or to another composite material), or both.
- a preferred approach is to employ a step of welding the composite of the invention to the other structure.
- the formed panel may be joined to other parts, when necessary, by techniques other than welding, such as by using adhesives, a brazing process, or the like.
- the composite material e.g., the laminate or sandwich sheet
- the unique features of the composite material render it an extremely attractive candidate for applications which traditionally utilize a regular monolithic metal sheet, such as in the body panels currently employed in the transportation (e.g., automotive) industry.
- One unique feature of the invention is that it includes specific selection of the polymer (e.g., thermoplastic polymer) and the metal fibers, and incorporation of metal fibers and optional particles, as well as other fillers, into the polymeric matrix to produce a novel formable composite material (e.g. sandwich or laminate structure) for low-cost stamping operation.
- stampable sandwiches can be joined by conventional welding techniques such as resistance welding (e.g., spot welding, seam welding, flash welding, projection welding, or upset welding), energy beam welding (e.g., laser beam, electron beam, or laser hybrid welding), gas welding (e.g., oxyfuel welding, using a gas such as oxyacetylene), arc welding (e.g., gas metal arc welding, metal inert gas welding, or shielded metal arc welding).
- resistance welding e.g., spot welding, seam welding, flash welding, projection welding, or upset welding
- energy beam welding e.g., laser beam, electron beam, or laser hybrid welding
- gas welding e.g., oxyfuel welding, using a gas such as oxyacetylene
- arc welding e.g., gas metal arc welding, metal inert gas welding, or shielded metal arc welding.
- Preferred joining techniques include high speed welding techniques such as resistance spot welding and laser welding.
- the use of a fibrous filler in the polymeric layer is believed to facilitate composite manufacturing and surprisingly low levels may be employed to achieve the beneficial results herein.
- the selection and combination of materials taught herein affords the ability to employ less metal per unit volume than conventional metal structures of like form (e.g., sheet metal) while still exhibiting comparable properties and characteristics.
- the problem that the skilled artisan might envision in such a combination of materials unexpectedly are avoided.
- some of the behavioral characteristics of the materials that might be predicted are surprisingly avoided, are employed advantageously in the resulting composite, or both.
- the resulting laminates thus render themselves as attractive candidates to be a drop-in substitute for existing materials, for example, they can be employed instead of sheet steel, without the need for significant investment in resources to re-tool or significantly alter processing conditions.
- the polymeric layer generally may include or even consist essentially of a filled polymer, (e.g., a thermoplastic polymer filled with a reinforcing fiber, such as a metallic fiber).
- a filled polymer e.g., a thermoplastic polymer filled with a reinforcing fiber, such as a metallic fiber.
- the filled polymeric material for use in the polymeric layer preferably is one that generally would be characterized as being relatively rigid (i.e., has a relatively high stiffness, e.g., an apparent modulus of rigidity of at least about 200 MPa as measured according to ASTM D1043-02, over a temperature range of about -40 0 C to about 5O 0 C).
- the rigidity of the material may be sufficiently high so that it can provide support for any layer between which it is disposed, such as the thin and soft face metal sheets (i.e., the metallic layers), the result of which is that the composite material would be capable of substantially supporting its own weight without sagging (e.g., a 10 cm x 10 cm sheet of the composite material having a thickness of between about 0.5 and 2 mm, if clamped one cm deep along one edge to form a cantilever having a free end opposing the clamped end would exhibit less than 5 mm deflection by the free end).
- the thin and soft face metal sheets i.e., the metallic layers
- the resulting composite will be sufficiently rigid that it helps to resist deformations such as dents at relatively low impact forces, but will also deform generally in a plastic manner (similar to sheet metals) when subjected to crash impact loads.
- the filled polymeric material may have a modulus of rigidity (as measured according to ASTM D1043-02) greater than isotactic polypropylene, nylon 6, the polymer absent any filler (i.e. the same polymer as the used in the filled polymeric material, but without the metallic fiber and other filler as taught) or any combination.
- the modulus of rigidity is at least 110%, more preferably at least 125%, and most preferably at least 150% of the modulus of rigidity of the unfilled polymer (i.e.
- the filled polymeric material may have a modulus of rigidity greater than about 200 MPa, preferably greater than about 400 MPa, more preferably greater than about 800 MPa, even more preferably greater than about 1500 MPa, and most preferably greater than about 2500 MPa.
- the polymer in the filled polymeric material is a thermoplastic, but it may be or include a thermoset polymer, particularly a thermoset polymer that is processable as a thermosplastic, but cured.
- a thermoplastic polymer Preferably, at least 50% (more preferably at least 60%, 70%, 80%, 90% or even 95%, if not 100%) by weight of the polymer used in the filled polymeric material is a thermoplastic polymer.
- the filled polymeric material may be characterized as being a relatively strong polymeric material.
- the filled polymeric material may have a relatively high tensile strength (as measured according to ASTM D638-08 at a nominal strain rate of about 0.1 s "1 ).
- the tensile strength of the filled polymeric material may be greater than the tensile strength of the unfilled polymer (i.e. the same polymer as used in the filled polymer, but without the metallic fiber and other filler as taught).
- the tensile strength is at least 110%, more preferably at least 125%, and most preferably at least 150% of the tensile strength of the unfilled polymer (i.e. the same polymer as used in the filled polymer, but without the metallic fiber and other filler as taught).
- the filled polymeric material may have a tensile strength greater than about 10 MPa, preferably greater than about 30 MPa, more preferably greater than about 60 MPa, even more preferably greater than about 90 MPa, and most preferably greater than about 110 MPa.
- the filled polymeric material may also be characterized as having a relatively high elongation at break.
- the filled polymeric material may be characterized by a percent elongation at break greater than 50%, preferably greater than 80% and most preferably greater than about 120%, as measured according to ASTM D638-08 at a nominal strain rate of about 0.1 s "1 .
- the filled polymeric material may have high strain hardening properties (e.g., a ratio of Y/G less than about 9, more preferably less than about 3, where Y is the extrapolated yield stress and G is the strain hardening modulus).
- the filled polymeric material may have electrical conductivity properties (e.g., the filled polymeric material may be an electrical conductor) such that the composite material may be welded to another structure such as a sheet metal and a conductive path is provided through the filled polymer.
- the electrical conductivity properties of the polymeric core material may be achieved by employing metallic fibers and optionally metallic or carbon black particles that are dispersed in the polymer in a quantity to have at least a percolation concentration (i.e., a minimum concentration at which a continuous network, or conductive path between the metal faces, is formed).
- a percolation concentration i.e., a minimum concentration at which a continuous network, or conductive path between the metal faces, is formed.
- examples of preferred percolation concentrations may be between 3-33% in volume (e.g., between 5-33%, between 10-30%, or even between 3-12%) in volume based on the total volume of the filled polymeric material. Of course, higher concentrations may also be used.
- the composite material may be weldable using art- disclosed weld schedules or with such weld schedules having up to five additional weld cycles and/or an increase in the weld current by less then about 50%, and/or an increase in the weld pressure by less than about 50%. It is unexpectedly found that the composite materials of the present invention may require fewer weld cycles (e.g., at least 25% fewer weld cycles), a lower weld current (e.g., at least 20% lower weld current), or both, to obtain a good weld, compared with the number of weld cycles and weld current required to obtain a good weld from a monolithic metal sheet having the same metal as a metal face on the composite and having the same total thickness. Such welding conditions advantageously allow for more economical weld schedules that are both faster and require less energy.
- the filled polymeric material preferably is light weight and has a density (as measured according to ASTM D792-00) at room temperature less than the density of the metal (assuming it is fully densified) of the metallic layer(s).
- the density of the filled polymeric material is preferably less than 75%, more preferably less than 60%, even more preferably less than 40% and most preferably less than 33% of the density of the metal of the metallic layer(s).
- the filled polymeric material e.g., including metallic fibers such as steel fibers
- the filled polymeric material will have a density of less than about 4 g/cm 3 , more preferably less than about 3.0 g/cm 3 , (e.g., the filled polymeric material may have a density in the range of 1.2 to 2.8 g/cm 3 or even 1.3 to 2.6 g/cm 3 )
- the filled polymeric material may additionally include one or more additives, such as antioxidants, stabilizers, lubricants, antiblocking agents, antistatic agents, coupling agents (e.g., for the fillers), foaming agents, pigments, flame retardant additives, and other processing aids known to the polymer compounding art.
- additives such as antioxidants, stabilizers, lubricants, antiblocking agents, antistatic agents, coupling agents (e.g., for the fillers), foaming agents, pigments, flame retardant additives, and other processing aids known to the polymer compounding art.
- Suitable flame retardants may include halogen containing flame retardants and halogen free flame retardants.
- the flame retardant may also include an antimony containing compound, such as antimony oxide.
- Exemplary flame retardants which may be employed include chlorine containing flame retardants, bromine containing flame retardants, nitrogen containing flame retardant (such as melamine cyanurate), phosphorus containing flame retardants (such as phosphates, organophosphates, salts of phosphinic acids, and organophosphites), condensates of melamine with phosphoric acid or with condensed phosphoric acids (such as melamine phosphate, melam polyphosphate, melon polyphosphate and melem polyphosphate), magnesium hydroxide (Mg(OH) 2 ) aluminium trihydrate (AI(OH) 3 ), and any combination thereof.
- Halogenated flame retardant compounds which may be used include flame retardants disclosed in U.S. Pat. Nos.
- the one or more additives may be present at a concentration less than about 30 wt%, preferably less than about 20 wt.% and more preferably less than about 10 wt.%, based on the combined weight of the polymer and additives.
- the filled polymeric material may be free of a plasticizer or other relatively low molecular weight materials which may become volatilized (e.g., during a resistance welding process).
- the concentration of plasticizer or other relatively low molecular weight materials preferably is less than about 3 wt.%, more preferably less than about 0.5 wt.%, and most preferably less than about 0.1 wt.% based on the total weight of the filled polymeric material (e.g., such that the filled polymeric material does not delaminate from a metallic layer).
- the teachings herein contemplate a step of selecting materials, processing conditions, or both, so that during processing, delamination of the filled polymeric material from the metallic layer is substantially, or entirely avoided (e.g., delamination caused by vapor pressure buildup at an interface between the filled polymeric material and the metallic layer sufficient for causing delamination).
- the polymers used for the filled polymeric material preferably include thermoplastic polymers that either have a peak melting temperature (as measured according to ASTM D3418- 08) or a glass transition temperature (as measured according to ASTM D3418-08) greater than about 50° C (preferably greater than about 80 0 C, even more preferably greater than about 100 0 C, even more preferably greater than about 12O 0 C, more preferably greater than about 160 0 C, even more preferably greater than 180 0 C, and most preferably greater than about 205 0 C).
- a peak melting temperature as measured according to ASTM D3418- 08
- a glass transition temperature as measured according to ASTM D3418-08
- the thermoplastic polymer may have a peak melting temperature, a glass transition temperature, or both that is less than about 300 0 C, less than about 250 0 C, less than about 150 0 C, or even less than about 100 0 C. They may be at least partially crystalline at room temperature or substantially entirely glassy at room temperature.
- the polymer may preferably have a strain hardening properties that will be characterized by a curve of tensile true stress (S t ) and a derivation of the polymer elongation having the form of: (L 2 -1/L) where L is the extension ratio, namely the ratio between the final and the initial length under tension (Haward R. N., Strain Hardening of Thermoplastics, Macromolec ⁇ les 1993,26, 5860-5869).
- S t tensile true stress
- L the extension ratio
- Y the extrapolated yield stress
- G the strain hardening modulus.
- Polymers suitable for the filled polymeric material may have a relatively high strain hardening modulus, a relatively low extrapolated yield stress, or both.
- the strain hardening modulus of the polymer may be greater than about 1 MPa, preferably greater than about 2 MPa, more preferably greater than about 4 MPa, and most preferably greater than about 10 MPa.
- the extrapolated yield stress may be less than about 120 MPa, preferably less than about 80 MPa, and more preferably less than about 30 MPa.
- the Y/G ratio preferably may be less than 9, preferably less than 3, and more preferably less than 2.
- thermoplastic polymers which may be suitable for the polymeric layer include polyolefins (e.g. polyethylene and polypropylene), acetal copolymers, polyamides, polyamide copolymers, polyimides, polyesters (e.g., polyethylene terephthalates and polybutylene terephthalate), polycarbonates, acrylonitrile butadiene styrene copolymers, polystyrenes, ethylene copolymers including at least 80 wt.% ethylene, copolymers including any of these polymers, blends of any of these polymers, or any combination thereof.
- polyolefins e.g. polyethylene and polypropylene
- acetal copolymers e.g. polyamides, polyamide copolymers, polyimides, polyesters (e.g., polyethylene terephthalates and polybutylene terephthalate), polycarbonates, acrylonitrile butadiene styrene copolymers
- Preferable polyolefins include polypropylene homopolymers (e.g., isotactic polypropylene homopolymer), polypropylene copolymers (e.g., random polypropylene copolymers, impact polypropylene copolymer, or other polypropylene copolymer containing isotactic polypropylene), polyethylene homopolymer (e.g., high density polyethylene, or other polyethylene having a density greater than about 0.94 g/cm 3 ), polyethylene copolymers (e.g., including at least about 80 wt.% ethylene), a blend of any of these polymers, or any combination thereof.
- polypropylene homopolymers e.g., isotactic polypropylene homopolymer
- polypropylene copolymers e.g., random polypropylene copolymers, impact polypropylene copolymer, or other polypropylene copolymer containing isotactic
- Polypropylene homopolymers and polypropylene copolymers may be substantially free of atactic polypropylene. If present, the concentration of atactic polypropylene in the polypropylene preferably is less than about 10 wt.%.
- Suitable polypropylene copolymers and polyethylene copolymers include copolymers that consist essentially of (e.g., at least 98% by weight), or consist entirely of one or more ⁇ -olefins.
- Other polypropylene copolymers and polyethylene copolymers that may be used include copolymers containing one or more comonomers selected from the group consisting acrylates, vinyl acetate, acrylic acids, or any combination thereof.
- the concentration of the comonomer may be less than about 25 wt.%, preferably less than about 20 wt.%, and more preferably less than about 15 wt.% based on the total weight of the copolymer.
- Exemplary polyethylene copolymers that may be used include ethylene-co-vinyl acetate (i.e., "EVA", for example containing less than about 20 wt.% vinyl acetate), ethylene-co-methyl acrylate (i.e., EMA), ethylene co- methacrylic acid, or any combination thereof.
- Suitable polyamides include reaction products of a diamine and a diacid, and monadic polyamides.
- Exemplary polyamides which are formed from a diamine and a diacid may include polyamides (e.g., nylons) containing reaction products of either adipic acid or terephthalic acid with a diamine.
- Exemplary monadic polyamides include nylon 6, and poly(p-benzamide).
- Nylons which may be used in the present invention include nylon 3, nylon 4, nylon 5, nylon 6, nylon 6T, nylon 66, nylon 6/66, nylon 6/66/610, nylon 610, nylon 612, nylon 69, nylon 7, nylon 77, nylon 8, nylon 9, nylon 10, nylon 11 , nylon 12, and nylon 91.
- Polyamide copolymers containing any of the above mentioned polyamides may also be used.
- Polyamide copolymers may include a polyether.
- Polyamide copolymers may be random copolymers, block copolymers, a combination thereof.
- Polyethers which may be used with a polyamide copolymer may include glycols. Exemplary glycols which may be used include propylene glycol, ethylene glycol, tetramethylene glycol, butylene glycol, or any combination thereof.
- Polyamide copolymers may include a plurality of polyamides.
- An exemplary polyamide copolymer that includes a plurality of polyamides is polyamide 6/66 which includes polyamide 6 and polyamide 66. Suitable polyamide 6/66 copolymers may include less than about 50 wt.% polyamide 66 based on the total weight of the polymer.
- the thermoplastic polymers are preferably relatively long chain polymers, such that they may have a number average molecular weight greater than about 20,000, preferably greater than about 60,000, and most preferably greater than about 140,000. They may be unplasticized, plasticized, elastomer modified, or free of elastomer. Semi- crystalline polymers may have a degree of crystallinity greater than about 10 wt%, more preferably greater than about 20 wt%, more preferably greater than about 35 wt%, more preferably greater than about 45 wt%, and most preferably greater than about 55 wt%.
- Semi-crystalline polymers may have a degree of crystallinity less than about 90 wt%, preferably less than about 85 wt%, more preferably less than about 80 wt%, and most preferably less than about 68 wt%. Crystallinity of the thermoplastic polymer may be measured using differential scanning calorimetry by measuring the heat of fusion and comparing it to art known heat of fusion for the specific polymer.
- the polymer of the filled polymeric material may also contain up to about 10 wt% of a grafted polymer (e.g., a grafted polyolefin such as isotactic polypropylene homopolymer or copolymer) which is grafted with a polar molecule, such as maleic anhydride.
- a grafted polymer e.g., a grafted polyolefin such as isotactic polypropylene homopolymer or copolymer
- a polar molecule such as maleic anhydride
- the thermoplastic polymer may include a substantially amorphous polymer (e.g., a polymer having a crystallinity less than about 10 wt.%, preferably less than about 5 wt.%, and most preferably less than about 1 wt.%, as measured by differential scanning calorimetry at a rate of about 10°C/min).
- the thermoplastic polymer may include a substantially amorphous polymer having a glass transition temperature greater than 50 0 C, preferably greater than 120 0 C, more preferably greater than about 16O 0 C, even more preferably greater than about 180 0 C, and most preferably greater than about 205 0 C, as measured by dynamic mechanical analysis at a rate of about 1 Hz.
- Exemplary amorphous polymers may include polystyrene containing polymers, polycarbonate containing polymers, acrylonitrile containing polymers, and combinations thereof.
- Examples of polystyrene containing polymers may include polystyrene homopolymers, impact modified polystyrenes, polystyrene block copolymers, and polystyrene random copolymers.
- Polystyrene block copolymers which may be used include block copolymers containing one, two, three, or more polystyrene blocks, and one or more blocks selected from the group consisting of butadiene, isoprene, acrylonitrile, or any combination thereof.
- the polystyrene block copolymer may be unsaturated, partially saturated, or completely saturated (e.g., the block copolymer may include an unsaturated comonomer, which, after polymerization is further reacted to remove some or all of the double bonds).
- exemplary styrene block copolymers may include styrene-butadiene-styrene (SBS) block copolymers, acrylonitrile-butadiene- styrene (ABS) block copolymers, styrene-isoprene-styrene (SIS) block copolymers, and styrene-acrylonitrile block copolymers (SAN).
- SBS styrene-butadiene-styrene
- ABS acrylonitrile-butadiene- styrene
- SIS styrene-isoprene-styrene
- SAN
- Blends of styrene containing polymers with other styrene containing copolymers, or with other amorphous polymers may also be used.
- the polymer of the filled polymeric material may include a blend of a styrene containing polymer selected from the group consisting of ABS, SBS, SIS, SAN, and polystyrene homopolymer with a polycarbonate.
- a preferred amorphous copolymer is a blend of ABS and polycarbonate.
- the ABS and polycarbonate blend has an elongation at break greater than about 30%.
- the polymeric layer may employ an elastomer having one or both of the following properties: a relatively low tensile modulus at 100% elongation (e.g., less than about 3 MPa, preferably less than about 2 MPa), a relatively high tensile elongation at break (e.g., greater than about 110%, preferably greater than about 150%) both measured according to ASTM D638-08 at a nominal strain rate of about 0.1 s "1 .
- the elastomer may function to improving the formability composite material, to increase the ductility of the filled polymeric material, or both.
- the elastomer may be a synthetic elastomer, a natural elastomer, or a combination thereof.
- Suitable elastomers may include styrene containing elastomer, ethylene containing elastomers, butadiene containing elastomers, natural rubber, polyisoprene, butane containing elastomers, and acylonitrile containing elastomers.
- Suitable elastomers include block copolymers, random copolymers, and homopolymers.
- the elastomer may include polymer molecules that are functionalized with one or more functional groups selected from maleic anhydride, a carboxylic acid, an amine, an alcohol, or an epoxide.
- a particularly preferred elastomer for rubber toughening nylon is a functionalized EPDM, such as a maleic anhydride grafted EPDM.
- the elastomer may be cross-linked (e.g., cross-linked beyond the gel point of the elastomer) or substantially free of cross-links.
- the elastomer may be substantially free of cross-links during a deformation (e.g., stamping) operation, and/or a welding (e.g., resistance welding) operation.
- the elastomer may include a curative, cure accelerator, or other chemical that will enable the elastomer to crosslink after a deformation operation (e.g., in a bake oven, such as an oven employed for drying a coating on the panel).
- the elastomer preferably is characterized by a hardness of less than about 87 Shore A, more preferably less than 70 Shore A, and most preferably less than about 50 Shore A, as measured according to ASTM D2240.
- the polymer of the filled polymeric material preferably is substantially free or entirely free of epoxy, or other brittle polymers (e.g., polymers having an elongation at failure of less than about 20% as measured according to ASTM D638-08 at a nominal strain rate of about 0.1 s "1 ), or both.
- the concentration of epoxy, other brittle polymers, or both is preferably less than about 20%, more preferably less than about 10%, more preferably less than about 5%, and most preferably less than about 2% by volume, based on the total volume of the filled polymeric material.
- Polymers useful in the filled polymeric material may have a relatively high coefficient of linear thermal expansion, e.g., above about 80 x 10 ⁇ 6 .
- the filled polymeric material contains one or more fillers.
- the fillers may be a reinforcing filler, such as fibers, and more particularly metallic fibers. Fibers may have an aspect ratio of the longest dimension to each perpendicular dimension (e.g., length to diameter) that is greater than about 10, preferably greater than about 20, and most preferably greater than about 50. At least a portion of the fibers (e.g., the longitudinal direction of the metal fibers) may be preferentially oriented or they may be randomly dispersed in the filled polymeric material.
- the overall general longitudinal direction of at least some of the fibers may be preferentially oriented perpendicular to the transverse direction of any layer of the filled polymeric material, or they may be randomly oriented with respect to the transverse direction of any such layer.
- the metallic fibers e.g., the longitudinal direction of the metallic fibers
- the metallic fibers may be preferentially oriented in one, two, or more direction(s) within the plane of such layer, or they may be randomly oriented within the plane of the layer.
- the metallic fibers may be uniformly distributed within the filled polymeric material of any layer or they may be selectively located within the filled polymeric material of any layer.
- FIG. 2 illustrates an example of how fibers may be distributed.
- Figure 2 depicts a plurality of fibers oriented in a plurality of directions some of which are entangled with each other and which are attached to polymer.
- the filled polymeric material may also contain one or more other fillers, such as a filler particle (e.g., powders, beads, flakes, granules, and the like).
- a filler particle is a filler that is not a fiber (i.e., it is not a filler having an aspect ratio of the longest direction to each perpendicular directions that is greater than about 10).
- the filler particle preferably has an aspect ratio of the longest direction to a perpendicular direction that is less than about 10, preferably less than about 8, and most preferably less than about 5.
- the filled polymeric material may contain a filler particle selected from metallic particles, carbon, carbon black (e.g., SRF, GPF, FEF, MAF, HAF, ISAF, SAF, FT and MT), surface-treated carbon black, silica, activated calcium carbonate, light calcium carbonate, heavy calcium carbonate, talc, mica, calcium carbonate, magnesium carbonate, clay, calcium silicate, hydrotalcite, diatomaceous earth, graphite, pumice, ebonite powder, cotton flock, cork powder, barium sulfate, wollastonite, zeolite, sericite, kaolin, pyrophyllite, bentonite, alumina silicate, alumina, silicon oxide, magnesium oxide, zirconium oxide, titanium oxide, iron oxide, iron phosphide, dolomite, calcium sulfate, barium sulfate, magnesium hydroxide, calcium hydroxide and aluminum hydroxide, boron nitride, silicon carb
- Exemplary fillers which may be used in the filled polymeric material include metallic particles, carbon black, graphite, nano-clay particles, or any combination thereof.
- the concentration of particle fillers is preferably less than about 10 volume %, more preferably less than 5 volume %, and most preferably less than 2 volume %, based on the total volume of the filled polymeric material.
- One or more filler may include a nano tube structures, a layered structures, an intercalated structure, or some other structure.
- Exemplary metallic fibers which may be used in the invention include fibers formed from metals such as steel (e.g., low carbon steel, stainless steel, and the like), aluminum, magnesium, titanium, copper, alloys containing at least 40 wt% copper, other alloys containing at least 40 wt% iron, other alloys containing at least 40 wt% aluminum, other alloys containing at least 40 wt% titanium, and any combination thereof. Any of the metals which may be used for the metallic layer(s), as described later, may also be used for the metallic fibers. Some or all of the metal fiber may be of a metal or a metal alloy that is generally corrosion resistant (e.g.
- the metal fiber may be of a metal or metal alloy (e.g., aluminum, magnesium, or both) that offers cathodic protection to the metallic layers and/or to other metallic fibers.
- the filled polymeric material may include metallic fibers that are of the same material or metallic fibers from a plurality of different materials.
- some of the metallic fibers may be of a metal or metal alloy that offers cathodic protection.
- the concentration of the fibers of a metal or metal alloy that offers cathodic protection is less than 60 wt.%, more preferably less than 20 wt.%, and most preferably less than about 10 wt.% based on the total weight of the metallic fiber. Mixtures of different metallic fibers may also be used.
- the filled polymeric material may contain non-metallic conductive fibers, such as carbon fibers, fibers formed from conductive polymers, and the like. If present, the weight ratio of the non-metallic fibers to the metallic fibers is preferably greater than about 1 :10, more preferably greater than about 1 :5, and most preferably greater than about 1 :3. If present, the weight ratio of the non-metallic fibers to the metallic fibers is preferably less than about 10:1 , more preferably less than about 5:1 , and most preferably less than about 3:1. It will be appreciated that filled polymeric material that are capable of being welded may also be prepared using non-metallic conductive fibers in place of the metallic fibers.
- Conductive polymers which may be used include polymers include poly(acetylene)s, poly(pyrrole)s, poly(thiophene)s, polyanilines, polythiophenes, poly(p-phenylene sulfide), poly(para-phenylene vinylene)s (i.e., PPV), polyindole, polypyrene, polycarbazole, polyazulene, polyazepine, poly(fluorene)s, and polynaphthalene, any blend thereof, any copolymer thereof, or any combination thereof.
- PPV and its soluble derivatives have emerged as the prototypical electroluminescent semiconducting polymers.
- Exemplary thiophenes which may be used include poly(3- alkylthiophene)s (such as poly(3-octylthiophene) and poly(3-(4-octylphenyl)thiophene)), poly(3-(alkylsulfanyl)thiophene)s, polybromothiophenes (such as poly(2-bromo-3- alkylthiophene), poly(2,5-dibromothiophene), and the like), polybithiophenes (such as poly(2,2'-bithiophene)s), or any combination thereof.
- poly(3- alkylthiophene)s such as poly(3-octylthiophene) and poly(3-(4-octylphenyl)thiophene)
- poly(3-(alkylsulfanyl)thiophene)s such as poly(2-bromo-3- alkylthi
- the weight average length, L avg , of the metallic fibers may be greater than about 0.5 ⁇ m, preferably greater than about 5 ⁇ m, more preferably greater than about 100 ⁇ m, even more preferably greater than about 1 mm, even more preferably greater than about 2 mm, and most preferably greater than about 4 mm.
- Suitable fibers may have a weight average length of less than about 200 mm, preferably less than about 100 mm, more preferably less than about 55 mm, and most preferably less than about 25 mm.
- the metallic fibers may also be described by the dispersity of the lengths.
- the metallic fibers may have a relatively narrow dispersity of lengths such that greater than 50% (or even greater than 70%) of the metallic fibers have a length between 0.8 * L avg and 1.2* L avg .
- the metallic fibers may have a relatively broad dispersity such that less than 50% (or even less than 30%) of the metallic fibers have a length between 0.8 * L avg and 1.2 * L avg .
- the metallic fibers may also be characterized by the weight average diameter of the fibers.
- the weight average diameter of the fibers may be greater than about 0.01 ⁇ m, preferably greater than about 0.1 ⁇ m, more preferably greater than about 0.5 ⁇ m, even more preferably greater than about 1.0 ⁇ m, even more preferably greater than about 3 ⁇ m, and most preferably greater than about 12 ⁇ m.
- the weight average diameter of the fiber may be less than about 300 ⁇ m, preferably less than about 100 ⁇ m, more preferably less than about 50 ⁇ m, and most preferably less than about 30 ⁇ m.
- the concentration of the metallic fibers is preferably greater than about 1 volume%, more preferably greater than about 3 volume%, even more preferably greater than about 5 volume%, even more preferably greater than about 7 volume%, even more preferably greater than about 10 volume%, and most preferably greater than about 12 volume% based on the total volume of the filled polymeric material.
- the metallic fibers may be present in the filled polymeric material at a concentration less than about 60 volume%, preferably less than about 50%, more preferably less than about 35 volume %, still more preferably less than about 33 volume%, and most preferably less than about 30 volume% (e.g., less than about 25 volume%, or even less than about 20, 10, or 5 volume%).
- the amount of fiber may be about 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, by volume based on the total volume of the filled polymeric material, or within a range bounded by those values (such as from about 1% to about 6%).
- composites herein may employ a concentration of metallic fibers that surprisingly is substantially lower than the amount of a particle filler necessary to achieve similar welding characteristics.
- the fibers and materials are selected so that better welding performance surprisingly may be realized at a relatively low concentration of metallic fibers as compared with an identical composite material having a higher concentration of metallic fibers.
- thermoplastic polymer material may be present in the filled polymeric material at a concentration greater than about 40 volume%, preferably greater than about 65 volume %, more preferably greater than about 67 volume%, still more preferably greater than about 70 volume%, and most preferably greater than about 75 volume% (e.g., at least about 80 volume%, at least about 90 volume %, or even at least about 95 volume%).
- the volume ratio of the polymer (e.g., the thermoplastic polymer) to the fibers (e.g., the metallic fibers) is preferably greater than about 2.2:1 , more preferably greater than about 2.5:1 , and most preferably greater than about 3:1.
- the volume ratio of the polymer (e.g., the thermoplastic polymer) to the fibers (e.g., the metallic fibers) is preferably less than about 99:1 , more preferably less than about 33:1 , even more preferably less than about 19:1 , and most preferably less than about 9:1 , (e.g., less than about 7:1).
- the material of any core m the sandwich composites herein may contain pores or voids, or may be substantially free of pores and voids.
- the concentration of pores and voids in the filled polymeric material is less than about 25 volume%, more preferably less than about 10 volume%, still more preferably less than about 5 volume%, and most preferably less than about 2 volume% (e.g., less than about 1% by volume), based on the total volume of the filled polymeric material.
- the fiber e.g., the conductive fiber, such as the metallic fiber
- the fiber preferably is present at a concentration greater than about 40 volume %, more preferably greater than about 70 volume %, and most preferably greater than about 80% (e.g., greater than about 90 volume %, or even greater than about 95 volume %) based on the total volume of the filler in the filled polymeric material.
- the combined volume of the polymer (e.g., thermoplastic polymer) and the metallic fibers is preferably at least about 90% by volume, more preferably at least about 95% by volume and most preferably at least about 98% by volume based on the total volume of the filled polymeric material.
- the metallic fibers provide one or any combination of electric conductivity for welding, a reinforcement for strengthening, or strain hardening the polymeric structure by utilizing fibers that as metals are capable of extending and imparting better strain hardening properties to the polymeric core.
- the tensile elongation (at failure) of the metal fibers is preferably greater than about 5%, more preferably greater than about 30%, and most preferably greater than about 60% as measured according to ASTM A370-03a.
- the metallic fibers, the metal particles, or both preferably reduces the melt flow rate of the filled polymeric material.
- the melt flow rate (as measured according to ASTM D1238, e.g., method K) of the filled polymeric material is preferably at least about 20% less than, more preferably at least about 40% less than, and most preferably at least about 60% less than the melt flow rate of the unfilled (i.e. the same polymer as used in the filled polymeric material, but without the metallic fiber and other filler as taught).
- the materials herein may employ in combination with fibers, a metallic particle.
- Metallic particles may be spherical, elongated, or of any shape other than a fiber shape.
- Each metallic particle may be characterized by a size equivalent to the diameter of a spherical particle having the same volume as the particle.
- the metallic particles may have an average size less than about 2 mm, preferably less than about 1 mm, more preferably less than about 0.1 mm, and most preferably less than about 0.07 mm (e.g., less than about 0.04 mm).
- the fibers e.g., the metallic fibers
- the fibers preferably are dispersed (e.g., randomly dispersed) in the polymeric matrix at a volumetric concentration of less than about 30% (more preferably less than about 25 %, and most preferably less than about 20%) by volume of the total polymeric layer).
- the ratio of the volume of the fibers (e.g., the metallic fibers) to the volume of the metallic particles in the filled polymeric material layer may be greater than about 1 :30, preferably greater than about 1:1 , and most preferably greater than about 2:1.
- metallic particles, metallic fibers, or both may be obtained by a step of grinding offal and/or scrap of a stamping operation of a monolithic metal material or of a composite material (e.g. of a sandwiched plates, such as one made according to the teachings of the present invention), a machining operation or other operation that generates particles.
- This grinding operation may also produce recycled polymeric material which may be melted together with the thermoplastic polymer to produce the polymeric core. In such reclaim steps, a substantial reduction in cost may be achieved.
- carbon in the form of powder, graphite, grapheme, or any combination thereof may also be added at a concentration preferably less than about 5 volume % based on the total volume of the polymeric layer, which may function, for example, to further increase the electric conductivity.
- Nano-clay particles may also be used, which may function, for example, to improve the polymer ductility.
- concentration of the nano-clay particles preferably is less than about 5 volume % based on the total volume of the polymeric layer.
- composites herein may employ a sandwich structure by which a mass of a polymeric core is flanked on opposing sides by spaced apart layers.
- a structure herein may include two sheets that have a metal fiber reinforced polymeric core material disposed between the sheets in contact with the sheets.
- the metal layers (e.g., the first metallic layer and the second metal layer) of the sandwich construction may be made of a suitable material (e.g., metal) in the form of foils or sheets or other layers having equal or unequal thickness (e.g., average thickness) across the layer.
- Each metallic layer may have a generally constant thickness or may have a thickness that varies.
- the face metal on each side may be made of materials having the same or different properties and be made of the same or different metals. If the metal faces are made of metal sheets of unequal thickness, materials having different properties, or materials having different metal.
- the composite material may have a marking or other means of identifying and distinguishing the different metal faces.
- the layers may be the same or different in composition, size (e.g., thickness, width, volume, or otherwise), shape, or other features, relative to each other layer. [0083]
- the metal layers may contain a pure metal or metal alloy containing at least about 40 mole% of one of the following metals: Fe (iron), Ni (nickel), Al (aluminum), Cu (copper), V (vanadium), Cr (chromium), or Ti (titanium).
- the metal faces may contain an alloy comprising two or more metals selected from the group consisting of Fe, Ni, Al, Cu, V, Ti, Cr, Mo (molybdenum), Mn (manganese), Mg (magnesium), or W (tungsten).
- Such metals or metal alloys may also contain additional metals or non-metals.
- suitable metals for the face metal may also contain C (carbon), or Si (silicon) at a concentration less than about 10 mole%.
- Exemplary materials which may be used for the metallic faces include regular steel, high strength steel, medium strength steel, ultra- high-strength steel, stainless steel, titanium, aluminum and their alloys.
- the metal or metal alloy may have one or more crystalline phases.
- the metal alloy (as may any fiber used) may have a crystalline phase selected from the group consisting of hexagonal closed pack, face center cubic, simple cubic, and body center cubic.
- the metallic layer may contain ferritic steel, austenitic steel, cementite, or any combination thereof.
- the metallic layer may be annealed, cold hardened, heat treated, precipitation hardened, or otherwise treated.
- the metallic layer may have relatively large grain size (e.g., greater than about 3 mm), or relatively small grain size (e.g., less 3 mm).
- the metal faces may have one or more surfaces plated or coated with a thin film.
- Exemplary coatings and platings may include one or any combination of galvanized, electrogalvanized, chrome plating, nickel plating, corrosion resistance treatment, e-coat, zinc coated, Granocoat, Bonazinc and the like.
- one or both of the metal faces are free of a coating with a material having an electrical resistivity less than about 10 ⁇ cm.
- a combination of different metallic materials may be used by having different kinds of metal faces on opposing sides of the polymeric layer and/or by using tailored blanks that combine different alloys (e.g., different grades of steel) and thicknesses of metals into a single blank.
- the above mentioned metals may be used for the metal face (i.e. for the first metallic layer).
- One or both of the metal faces preferably may be relatively thick, such that the metal face does not wrinkle, tear, or form other defects when preparing and/or processing the composite material.
- the thickness of one or both of the metal faces is at least about 0.05 mm, more preferably at least about 0.10 mm, even more preferably at least about 0.15 mm, and most preferably at least about 0.18 mm.
- the sheets may have a thickness less than about 3 mm, preferably less than about 1.5 mm, and more preferably less than about 1 mm, and most preferably less than about 0.5 mm.
- the composite material may be used in an automotive panel requiring at least one class A or class B surface, preferably at least one class A surface.
- Such a composite material may have a first surface which is a class A surface and a second surface which is not a class A surface.
- the class A surface may have a first metal face having a relatively high thickness and a second surface that has a second metal face having a relatively low thickness (e.g., at least about 20% or even at least about 40% less than the thickness of the first metal face).
- the ratio of the thickness (e.g., average thickness) of the first metal layer to the thickness of the second metal layer may be from about 0.2 to about 5, preferably from about 0.5 to about 2.0, more preferably from about 0.75 to about 1.33 and most preferably from about 0.91 to about 1.1.
- the composite material may be in the form of a multi-layered sheet, e.g., a sandwich structure including sheets of a material such as a metal that sandwich a core of the filled polymeric material.
- the sheets may have a total average thickness less than about 30 mm, preferably less than about 10 mm, more preferably less than about 4 mm and most preferably less than about about 2 mm; and preferably greater than about 0.1 mm, more preferably greater than about 0.3 mm, and most preferably greater than about 0.7 mm).
- the composite material may have a generally uniform thickness or the composite material may have a thickness that varies (e.g., a random or periodic variation in one or more directions).
- the variation in the thickness may be such that the standard deviation of the thickness is less than about 10% of the average thickness.
- the standard deviation of the thickness is preferably less than about 5% of the average thickness, more preferably less than about 2% of the average thickness, and most preferably less than about 1% of the average thickness.
- the thickness of the filled polymeric layer may be greater than about 10%, 20% 30%, 40%, or more of the total thickness of the composite material.
- the volume of the filled polymeric layer may be greater than about 10%, 20%, 30%, 40%, or more of the total volume of the composite material. Preferably, greater than 50% of the volume of the composite material will be the filled polymeric material.
- the concentration of the filled polymeric material is more preferably greater than about 60 volume% and more preferably greater than about 70 volume% based on the total volume of the composite material.
- the concentration of the filled polymeric material is typically less than 92 volume% based on the total volume of the composite material; however, higher concentrations may be used, particularly in relatively thick composites (e.g., having a thickness greater than about 1.5 mm).
- the total thickness of outer layers of a sandwich composite structure herein may be less than about 70% of the total thickness of the composite material.
- the total thickness of metallic layers preferably is less than about 50%, more preferably less than about 40% and most preferably less than about 30% of the total thickness of the composite material.
- the total thickness of the outer layers e.g., the metallic layers
- the polymeric core layer preferably is in contact (direct or indirect, such as via a primer and/or adhesive layer) with at least a portion of the surface of the adjoining layers (e.g., one or more metallic layer) facing the core layer.
- the area of contact is at least about 30%, more preferably at least about 50%, most preferably at least about 70% of the total area of the surface of the adjoining layer facing the polymeric core layer.
- the composite material may include a plurality of polymeric core layers.
- the composite material may include one or more core layers which includes an adhesive such that it adheres to a metallic layer, a different core layer, or both.
- the composite material may have a relatively high stiffness (e.g., flexural stiffness (i.e., apparent bending modulus) as measured at about 20 0 C according to ASTM D747) to density ratio.
- flexural stiffness i.e., apparent bending modulus
- density ratio e.g., density ratio to density ratio.
- the composite material containing at least 30 volume % of core material and having a thickness, t may have a stiffness to density ratio which is greater than the stiffness to density ratio of a sheet made of the same material (e.g., metal) as the face material (e.g., metals), and having the same thickness t.
- the stiffness to density ratio of the composite material may exceed the stiffness to density ratio of a sheet of the face material (e.g., metal) having the same thickness by greater than about 5%, preferably greater than about 10%, more preferably greater than about 14%, and most preferably greater than about 18%.
- a sheet of the face material e.g., metal
- the layers adjoining the filled polymeric material typically have a relatively low coefficient of linear thermal expansion.
- the ratio of the coefficients of linear thermal expansion of a metallic layer to the thermoplastic polymer may be from about 1 :30 to about 1 :3, more preferably from about 1 :15 to about 1 :5.
- the composite material surprisingly does not delaminate or otherwise fail after cycling between extreme ambient temperatures (e.g., between -40 0 C and +40 0 C) despite the large difference in the coefficients of linear thermal expansion between the polymer phase and the adjoining materials (e.g., the metallic face material).
- the relatively low coefficient of thermal expansion of the metallic fibers reduces the coefficient of linear thermal expansion of the filled polymeric material so that delamination is reduced or even eliminated.
- the composite material may be prepared using a process that results in the filled polymeric material (e.g., core layer) being bonded to at least one adjoining layer (e.g., a metallic sheet) and preferably being interposed between two layers (e.g., two metallic layers) and bonded to one or both layers.
- the process may include one or any combination of steps of heating, cooling, deforming (e.g., forming, such as by stamping), or bonding, in order to arrive at a final desired article.
- the adjoining layers may be provided in the form of a rolled sheet, a forging, a casting, a formed structure, an extruded layer, a sintered layer, or any combination thereof.
- the sheets may be heated to a temperature greater than about 90 0 C (e.g. greater than about 130 0 C, or greater than about 180 0 C).
- the sheets are heated to a temperature greater than about T min , where T min is the highest glass transition temperature (T 9 ) and melting temperature (T m ) of the filled polymeric material.
- T min is the highest glass transition temperature (T 9 ) and melting temperature (T m ) of the filled polymeric material.
- the metallic sheets, the filled polymeric material, or both may be heated to a maximum temperature above which the polymer (e.g., the thermoplastic polymer) may undergo significant degradation.
- the thermoplastic polymer may be heated to a temperature preferably less than about 350 0 C, more preferably less than about 300 0 C.
- the heated polymer may be mixed with the metallic fiber, and with any additional fillers.
- the heated polymer (e.g., thermoplastic polymer) may be extruded as a sheet layer.
- the sheet layer may be extru
- the polymeric core layer may be a homogeneous layer or may comprise a plurality of sublayers.
- the filled polymeric material may contain an adhesive layer (e.g. on one or more surfaces).
- the adhesive layer or layers preferably include metallic fibers, conductive filler particles (e.g., a conductive filler particle selected from the group consisting of metallic particles, carbon black, graphite, iron phosphide, and combinations thereof), or both.
- Such an adhesive layer may be selected and applied to provide sufficiently good adhesion (e.g., a cohesive failure mode is observed when peeling the metal layer from the polymeric layer) to the metal face, the polymeric core, or both.
- An adhesive layer may include a conductive fiber (e.g., the adhesive layer may be a fiber-filled polymeric layer that includes metallic fiber).
- the composite material may be free of any adhesive and/or adhesive layer.
- the process for fabricating the composite material may also include one or more steps of heating one or more metal layers, applying pressure to the layers, calendaring a polymer (e.g., a thermoplastic polymer or the thermoplastic polymer compounded with the metallic fiber and the optional fillers), and annealing the composite sheet (e.g., at a temperature greater than the melting temperature of any thermoplastic polymer in the material).
- a polymer e.g., a thermoplastic polymer or the thermoplastic polymer compounded with the metallic fiber and the optional fillers
- annealing the composite sheet e.g., at a temperature greater than the melting temperature of any thermoplastic polymer in the material.
- the process for preparing the filled polymeric material may include a step of contacting the fiber and the polymer (e.g., thermoplastic polymer).
- the step of contacting the fiber and the polymer may occur prior to, or during a step of forming the filled polymeric material.
- a precursor feedstock filled polymeric material including the fiber and at least a portion of the polymer may be prepared by a pultrusion process including a step of pultruding a single fiber or preferably a plurality of fibers through a polymer in a liquid state (e.g., a molten thermoplastic polymer), such that the fibers are coated with the polymer.
- the process of preparing a precursor feedstock polymer material preferably employs continuous fibers and the feedstock material is preferably chopped into pellets, granules, rods, or other shape (each typically having a mass of less than about 2 grams) suitable for feeding into a polymer extruder or other polymer processing equipment.
- the fibers in each pellet, granule, or rod will aligned in a generally axially orientation.
- a precursor feedstock filled polymeric material may be prepared by blending the fibers and at least a portion of the polymer (e.g., the thermoplastic polymer) in an extruder, internal mixer, mill, or other polymer mixing equipment, at a temperature at which the polymer flows.
- the fiber and the polymer are contacted during the process of preparing the polymeric layer.
- fiber and polymer (e.g., thermoplastic polymer) materials may be dry blended and fed into a polymer processing equipment, they may be fed individually but at the same time and location into the polymer processing equipment, or they may be fed into different locations or at different times into the polymer processing equipment.
- the process of forming a precursor feedstock filled polymeric material or of forming the polymeric layer may include a step of chopping the fibers and feeding them directly into the polymer processing equipment (such a process may be free of a step of storing the chopped fibers, or include a step of contacting the fibers with a partitioning agent (e.g., a powder such as a powder filler or a powder polymer)).
- a partitioning agent e.g., a powder such as a powder filler or a powder polymer
- the process of forming the polymeric layer may be a continuous process or a batch process. Preferably, the process is a continuous process.
- the process may include a step of providing a third metal layer (in addition to the first and second metal layer). It may include a step of interposing a second polymeric core layer between the second metal layer and the third metal layer, such that the second metal layer is interposed between the two polymeric layers.
- the third metallic layer preferably may be perforated (e.g., having a plurality of openings covering at least about 20%, more preferably at least about 40%, and most preferably at least about 60% of the surface of the third metallic layer).
- the process may include a step of contacting a filled polymeric material surface of a laminate with the surface of either a second metallic layer or a filled polymeric material of a second laminate at a temperature greater than T mini where T m ⁇ n is the greater of the highest melting temperature or the highest glass transition temperature of polymer in the filled polymeric material, such that the contacting surfaces at least partially bond and forms a composite having a filled polymeric material layer interposed between two metallic layers.
- the process may also contain a step of applying pressure to the first and second metal layer, e.g., by feeding the composite material through one or more pairs of rollers having a predetermined spacing.
- the step of applying pressure preferably occurs when at least some of the polymer of the filled polymeric material (e.g., the thermoplastic in contact with the metal layer) is above T mm .
- the step of applying pressure may occur when at least some of the polymer of the filled polymeric material is at a temperature greater than about 8O 0 C, preferably greater than about 120 0 C, more preferably greater than about 180 0 C, even more preferably greater than about 210 0 C, and most preferably greater than about 230 0 C.
- the process may also include a step of cooling the composite material (e.g. to a temperature below T m ⁇ n , preferably below the melting temperature of polymer of the filled polymeric material, and more preferably below about 5O 0 C).
- the process may also include a step of applying one or more spacers for separating opposing layers and in the space into which the filled polymeric material is introduced (e.g., between first and second metal layers). Structures herein thus also contemplate inclusion of one or more spacers between the layers.
- a spacer may be entirely interposed between two opposing layers, or the spacer may have a first section that is interposed between two opposing layers and a second section (which may have a larger thickness than the first section) that is not interposed between the layers.
- the spacer may be a rod, a bead, a member having a profile (e.g., a profile having a generally uniform cross-section), a deformation deliberately formed into a metal layer, or any combination thereof.
- the composite material may be a laminate, which preferably has a uniform thickness.
- the variation in the thickness of the laminate may be the same as for the sheet as described above.
- the process for manufacturing the laminate may be similar to the process for manufacturing the sheet, except that only one metal sheet is utilized.
- the process for manufacturing the composite material may be free of a step of heating the composite material to a temperature at which the metallic fibers may sinter or otherwise fuse directly together (e.g., in a metallurgical bond), to a temperature at which the metallic fibers undergo a phase transition, to a temperature at which internal stresses in the metallic fibers are relieved (e.g., following an operation of stamping the composite), or any combination thereof.
- the process of preparing the a core filled polymeric material layer may employ a printing (e.g., an inkjet printing) or lithography (e.g., photolithography) process to deposit a plurality of layers including metal to build a 3-dimensional electrically conductive metallic network.
- a metallic network may be present in any of the concentration ranges described herein for the fibers.
- the filled polymeric layer may be formed by contacting the fibers with one or more monomers or prepolymers, followed by a step of polymerizing the one or more monomers or prepolymers. The polymerization may occur in a processing equipment (e.g., in an extruder), on a form, or in a mold; on a metallic layer, between two metallic layers, or the like.
- the teachings herein generally contemplate sandwich structures that are open at their edges.
- the process may include a step of treating the edge of the composite material to seal the edge.
- One or more edges of the composite material may be sealed by a mechanical operation (e.g., crimping or bending of the composite material), by a cover (e.g., a coating, a lamination, or an attached cover), or by a welding, soldering, or brazing operation.
- the composite material of the present invention may be subjected to a suitable forming process, such as a process that plastically deforms a material and may include a step of stamping, roll forming, bending, forging, punching, stretching, coiling, some other metalworking, or any combination thereof.
- a preferred forming process is a process that includes a step of stamping the composite material.
- the stamping process may occur at or near ambient temperatures.
- the temperature of the composite material during stamping may be less than about 65 0 C 1 preferably less than about 45°C, and more preferably less than about 38°C.
- the forming process may involve drawing regions of the composite material to various draw ratios.
- the composite material is subjected to a step of drawing to a relatively high draw ratio without breaking, wrinkling, or buckling.
- a step of drawing so that at least a portion of the composite is drawn to a draw ratio greater than 1.2.
- the composite material may be capable of being drawn and is drawn to a maximum draw ratio greater than about 1.5, preferably greater than about 1.7, more preferably greater than about 2.1 , and most preferably greater than about 2.5.
- the cracking limit of the draw ratio may be determined using the circular cup drawing test as described by Weiss et al. (M. Weiss, M. E. Dingle, B. F. Rolfe, and P. D.
- the forming process may include a step applying a pressure to a die (e.g., a die having a hardness, as measured according to Mohrs hardness scale, greater than the hardness of the metallic fibers) in contact with the composite material.
- a die e.g., a die having a hardness, as measured according to Mohrs hardness scale, greater than the hardness of the metallic fibers
- composites including a porous metallic fiber core i.e., a core that is substantially free of thermoplastic and optionally including an adhesive layer
- the fibers tear and/or the two metallic layers delaminate, unless the concentration of fibers is high or the fiber is replaced with perforated metal containing at least about 28% metal by volume, as demonstrated by Mohr (Dirk Mohr, "On the Role of Shear Strength in Sandwich Sheet Deforming," International Journal of Solids and Structures, 42 (2005) 1491-1512).
- the failure mechanisms observed by Mohr are surprisingly overcome by employing a polymeric core layer having relatively low concentrations of metallic fiber (e.g., including less than about 28% metallic fiber based on the total volume of the core).
- metallic fiber e.g., including less than about 28% metallic fiber based on the total volume of the core.
- the improved deformation characteristics at low metallic fiber concentration is related to the core layer being substantially or even completely free of pores and/or voids.
- the composite structures illustrated herein have an unexpectedly high amount of deformation (e.g., a relatively high draw ratio) prior to fiber tearing and/or delamination of the metallic layers.
- a particularly preferred stamping or drawing process is a process that operates at greater than about 1 stroke (e.g., 1 part) per minute, more preferably greater than about 5 strokes per minute, even more preferably greater than about 25 strokes per minute, and most preferably greater than about 60 strokes per minute.
- the stamping process may include a blank holding force to hold a periphery of the blank (i.e., a periphery of the composite material being stamped).
- the blank holding force is greater than about 0.03 kg/mm 2 , more preferably greater than about 0.10 kg/mm 2 , and most preferably greater than about 0.18 kg/mm 2 .
- the stamping process may include one, two, or more drawing steps.
- the maximum draw for the first draw of the stamping process (as measured by the maximum % reduction in thickness) is less than about 60%, more preferably less than about 50% and most preferably less than about 45%.
- the stamping process may include one or more steps of piercing the part, trimming the part, flanging the part, or any combination thereof, which may be a separate step or may be combined (e.g., with a drawing step).
- the composite material when tested according to the channel bending method (e.g., at 23°C) described by Weiss et al. (M. Weiss, M. E. Dingle, B. F. Rolfe, and P. D. Hodgson, "The Influence of Temperature on the Forming Behavior of Metal/Polymer Laminates in Sheet Metal Forming," Journal of Engineering Materials and Technology, October 2007, Volume 129, Issue 4, pp. 530-537) may have a wall springback angle less than about 10%, preferably less than about 8%, more preferably less than about 5%, and most preferably less than about 2%. When tested by the same method, the composite material may be characterized by a flange springback angle less than about 2%, preferably less than about 1.5%, and more preferably less than about 1.0%.
- the composite material is weldable (e.g., weldable using a resistance welding technique such as spot welding, seam welding, flash welding, projection welding, or upset welding) and has a relatively low electrical resistance.
- a resistance welding technique such as spot welding, seam welding, flash welding, projection welding, or upset welding
- the teachings herein thus also contemplate one or more steps of welding the composite materials taught herein.
- the electrical resistance of the composite material in the through-direction may be described by the sum of the electrical resistance of the metallic layers and the core layer.
- the electrical resistance of the metallic layers is much less than the electrical resistance of the core layer, such that the electrical resistance of the composite material may be estimated by the electrical resistance of the core layer.
- the resistivity e.g., the resistivity measured in the through-thickness direction, normal to the plane of a sheet
- I the current
- Resistivity (V/l) (A/t) where A is the area of the sheet, and t is the thickness of the sheet.
- the resistivity (in the through-thickness direction) of the composite material, the core layer, or both, may be relatively low (e.g., the composite material, the core layer, or both, may be characterized by a resistivity less than about 100,000 ⁇ -cm, preferably less than about 10,000 ⁇ cm, more preferably less than about 3,000 ⁇ cm, and most preferably less than about 1 ,000 ⁇ cm).
- the composite materials of the present invention may provide for improved thermal characteristics compared with a monolithic metallic material having the same dimensions.
- the composite material may have a relatively low thermal conductivity (e.g., the composite material may be a sheet having a relatively low thermal conductivity measured in the through-thickness direction, normal to the plane of the sheet).
- a composite material according to the teachings herein may have a thermal conductivity (e.g., in the through-thickness direction) that may be less than (preferably at least about 10% less than, more preferably at least about 50% less than, and most preferably is at least about 90% less than the thermal conductivity of a monolithic material having the same dimensions as the composite material and consisting of the same metal as used in a metallic layer of the composite.
- the thermal conductivity in the through-thickness direction of the composite material preferably is less than about 25 W/m °K, more preferably less than about 14 W/nv°K, even more preferably less than about 10 W/m °K, even more preferably less than about 5 W/m °K, and most preferably less than about 1 W/m °K.
- the composite material according to the teachings herein may include a core layer that reduces acoustical transmission, reduces sound generation, reduces vibrations, or any combination thereof.
- the peak acoustical transmission (e.g., as measured according to SAE J1400), the peak vibration transmission, or both, through the composite material preferably may be less than the value for a monolithic material having the same dimensions, more preferably by at least 10%, even more preferably by at least 50%, and most preferably by at least 90%.
- weld joints made using various composites taught herein may exhibit a variation of microstructures across the composite.
- a joint might be characterized as having (on sides laterally flanking the weld) spaced apart metal where each sheet includes ferrite and optionally cementite (e.g., in a pearlite structure).
- the weld itself may be characterized as including ferrite, carbide, and optionally austenite (e.g., in a banite structure). Progressing along the material length, there may be an increase in the carbon content from the lateral locations of the weld joints.
- a weld joint 30 may be formed between the composite material 12 (including a first metallic layer 14, a second metallic layer 14' and a polymeric core layer 16) and a second metallic material 36 (e.g., a second composite material or a monolithic metal material, such as a steel sheet).
- the weld joint will have at least two weld zones including a first weld zone 32 resulting from the welding of the first metallic layer 14 and the second metallic layer 14' and a second weld zone 34 resulting from the welding of the second metallic layer 14' and the second metallic material 36.
- the weld joint may also include a metal rich region 38 between the two metallic layers of the composite material and adjacent to the weld joint.
- the metal rich region may include metal that is squeezed out by the weld tips during a welding operation.
- the metal rich region may include or consist essentially of metal from the metallic fibers in the composite.
- a welding operation may first melt the polymer under the weld tips and the weld pressure may force some or all of the polymer away from the weld (e.g., prior to melting of the metal), that a welding operation may melt some or all of the metallic fibers under the weld tips prior to melting the metallic layers, or both.
- the concentration of carbon in the metal (and thus the hardness) at various regions of the first metallic layer as shown in FIG. 3A (32, 40, 41, 42) may be the same or different, and preferably are the same.
- the microstructure of the first metallic layer near the weld zone 32 may be the same or different from the microstructure of the first metallic layer away from the weld zone 40. Differences in microstructure may result from different concentration of iron, carbon, other metals, or any combination thereof (such as may arise from mixing of the first metallic layer with atoms from the second metallic layer, the metallic fibers, the polymer, or any combination thereof), or from differences in thermal treatment (such as from the heating and cooling cycle of the weld).
- the microstructure of the metal at the weld zone 32 may have the same microstructure (e.g., the same carbon concentration, the same crystal structures, such as a bainite structure, a pearlite structure, a pure ferrite structure, a martensite structure, an austenite structure, and the like, or any combination thereof) as obtained when welding the first metallic layer and the second metallic layer without a polymeric layer.
- the polymeric layer including both a thermoplastic and metallic fibers, may not affect the microstructure of the weld joint.
- the process may include one or more steps subsequent to a welding step of treating the workpiece (i.e., the welded structure) such that a microstructure is changed.
- the workpiece i.e., the welded structure
- the workpiece may be annealed, mechanically worked, or treated by a surface hardness modification step (e.g., a carborization of the surface).
- a step where a microstructure is changed may also be characterized as a step in which a phase transition occurs.
- FIG. 3B illustrates the microstructure in the region near a weld joint 30'.
- the polymeric layer 16 near the weld zone 32 may have varying concentrations of metallic fibers 20 and polymer 18 moving laterally from the weld zone.
- the weld zone may be partially or even entirely encircled by a metal ring 38, and have one or more metallic fiber rich regions 39 (e.g., that may be formed when polymer is melted and squeezed out of the weld zone and out of regions near the weld zone).
- the thickness of the metallic layers 14 and 14' may have relatively little variation moving laterally away from the weld zone compared with the thickness of the polymeric layer which may have a relatively large variation. As illustrated in FIG.
- the thickness of the polymeric layer may be substantially reduced in the region 39 adjacent to the weld joint compared with the thickness of the polymeric layer prior to welding.
- the thickness of the polymeric layer in the region adjacent to the weld joint may be reduced by at least 20%, preferably reduced by at least about 50%, and more preferably reduced by at least about 60% compared to the thickness of the polymeric layer prior to any welding operation.
- the weld joint may include a ring 38 of a metal partially encircling or entirely encircling the weld joint and preferably attached to the weld zone 32 of the weld joint.
- the ring may have any cross-section, such as a triangle, a rectangle, a trapezoid, a circle sector, and the like.
- the ring may have a cross-section that has a generally circle sector shape.
- the ring is formed at least partially or even substantially entirely from the metallic fiber material (e.g., metallic fibers that are melted and squeezed out during the welding operation), and may be of a different metal than the metals on either side of the weld zone 32 (i.e., different metals from the first metallic layer and the second metallic layer).
- the metallic fiber material e.g., metallic fibers that are melted and squeezed out during the welding operation
- the weld joint may include a first metallic layer having a first metal in welded contact with a second metal of a second metallic layer, wherein the first metal and the second metal are the same or different; and a metallic ring at least partially encircling the weld zone (e.g., the weld zone defined by the region of contact of the first and second metallic layers), disposed between the first and second metallic layers, and attached to the first, second, or both metallic layers in the weld joint, wherein the metallic ring is of a metal that is different from the first metal and the second metal.
- the composite materials of the present invention may be used in any number of applications requiring one or any combination of the properties described herein, including but not limited to relatively low density, relatively low thermal conductivity, relatively high stiffness to density ratio, or relatively low acoustical transmission.
- Exemplary applications which may employ the composite materials of the present invention may include automotive and other transportation related applications, building construction related applications, and appliance related applications.
- the composite materials may be used in applications such as an automotive panel, a truck panel, a bus panel, a container (e.g., a container used for shipping), a panel on a train car, a panel on a jet, a tube (e.g., a bicycle tube), a motorcycle panel, a trailer panel, a panel on a recreational vehicle, a panel on a snowmobile, an automotive bumper fascia, a spoiler, a wheel well liner, an aerodynamic ground effect, an air dam, a container, a bed liner, a divider wall, an appliance housing, or a seat pan.
- a container e.g., a container used for shipping
- a panel on a train car e.g., a panel on a jet
- a tube e.g., a bicycle tube
- a motorcycle panel e.g., a bicycle tube
- a motorcycle panel e.g., a bicycle tube
- a motorcycle panel e.g., a
- the composite materials may be used as a building construction material, such as an exterior trim element, flashing, gutters, shingles, walls, flooring, countertops, cabinet facing, window frames, door frames, paneling, vents, ducts, planking, framing studies, shelving, plumbing fixtures, sinks, shower pans, tubs, and enclosures.
- An exemplary application is an vehicle body panel (e.g., a body outer skin of a vehicle such as an automobile).
- Automobile panels which may use the composite materials described herein include front quarter panels, rear quarter panels, door panels, hood panels, roof panels, or otherwise.
- the automotive panel may have a class A, class B, or class C surface, preferably a class A or class B surface, and more preferably a class A surface.
- the composite materials herein may also include one or more decorative outer surfaces or veneers, such as a metal veneer, a wood veneer, a polymeric veneer, or otherwise.
- the outer surface may have a different texture, color or other appearance as an opposing layer.
- a ferrous outer layer may be colored so that it simulates a copper color, a bronze color, a brass color, a gold color, or some other color.
- the composite materials of the present invention may be used in a process that includes a step of coating the composite material, such as an electrocoating process, a paint process, a powder coat process, any combination thereof, or the like.
- the coating process may include one or more steps of cleaning or otherwise preparing the surface, one or more steps of heating or baking the coating (e.g., at a temperature greater than about 100 0 C, preferably greater than about 12O 0 C), or any combination thereof.
- the coating may be applied by any conventional means, such as by a dipping process, a spraying process, or with a process employing an applicator such as a roller or a brush.
- the composite material preferably is free of ingredients (e.g., low molecular weight ingredients) that leach out and contaminate a bath of a coating process, such as a bath of an electrocoat process.
- methods herein include one or more coating steps that are free of bath contamination due to an ingredient of the composite.
- the composite material (e.g., a stamped part formed of the composite material) may be used in an assembly which requires joining the composite material to one or more other materials or parts.
- the composite material may be mechanically joined to another part using a fastener, or chemically joined to another part using an adhesive, an adhesion promoter (e.g., a primer), or both.
- Other means of joining include welding, brazing, and soldering. One or any combination of these joining methods may be employed.
- the composite material does not delaminate (e.g., the metallic layer does not delaminate from the core layer) during the processing of the composite material to form a part or an assembly.
- the composite material preferably does not delaminate during a stamping operation, during a joining operation (e.g., during a welding operation), or both.
- the composite material may be substantially free of gas pockets where gas at an elevated pressure has accumulated between layers.
- One or more layers may include one or more apertures to vent any accumulated gas.
- a plurality of perforations in a metal layer may surround a weld site, and allow any gas to escape that may arise due to welding.
- the polymeric layer includes one or more cells into which gas may migrate to avoid pressure build up. Similar results are expected by use of plain carbon steel or other steel fibers.
- Properties discussed herein may be exhibited over an entire part made using the composite materials herein, or over only a portion of it. Parts may be characterized as exhibiting substantially no visible detectable read through of any fibers (i.e. an outer show surface is free of visibly detectable (e.g., by the naked eye)) surface deformations that would be the result of compression of the layers with fibers between them. It is possible that, prior to any welding, the microstructure of the metals may be substantially continuous across at least a portion if not the entirety of the part. [00123] It may be possible to selectively induce property differences at predetermined locations across a part.
- Another aspect of the invention contemplates a method for post- consumer reclamation, recycling, or both of parts made using the present invention.
- One approach envisions providing a part having the composite structure taught herein, and subjecting it to a step of separating hydrocarbon compounds (e.g., by an elevated temperature heating step) from the metallic materials. Either or both of the hydrocarbon compounds or the metallic materials can be recovered and re-used.
- compositions of the following examples may be varied by about ⁇ 20% and give similar results (e.g., within about ⁇ 20%). Further, other materials taught herein may be substituted for those stated and similar results are contemplated.
- the core material for the light weight composite is prepared by melt blending about 45 g nylon 6 and about 72 g stainless steel fibers having an average diameter of about 3-1 O ⁇ m and an average length of about 2-4 mm in a Brabender
- the nylon 6 has a density of about 1.142 g/cm 3 and the steel has a density of about 7.9 g/cm 3 .
- example 1 contains about 18.8 volume% steel fibers and about 81.2 volume% nylon 6 and has a density of about 2.411 g/cm 3 .
- a core material is prepared using the same method as for Example 1 , except the weight of the stainless steel fiber is about 102 g and the weight of the nylon 6 is about 4Og.
- the admixture contains about 26.9 volume% steel fibers and about 73.1 volume% nylon 6 and has a density of about 2.962 g/cm 3 .
- a core material is prepared using the same method as for Example 1 , except the weight of the stainless steel fiber is about 48 g and the weight of the nylon 6 is about 53.5g.
- the admixture contains about 15 volume% steel fibers and about 85 volume% nylon 6 and has a density of about 2.157 g/cm 3 .
- a core material is prepared using the same method as for Example 1 , except the weight of the stainless steel fiber is about 35.4 g and the weight of the nylon 6 is about 50.6g.
- the admixture contains about 10 volume% steel fibers and about 90 volume% nylon 12 and has a density of about 1.816 g/cm 3 .
- a core material is prepared using the same method as for Example 1, except no stainless steel fiber is used and about 53 g of the nylon 6 is mixed in the
- Comparative Example 5 has a density of about 1.142 g/cm 3 .
- Composite materials are prepared by compression molding a sandwich panel containing two steel plates, each having a thickness of about 0.20 mm a length of about 74.2 mm and a width of about 124.2 mm, and the Nylon 12, without metallic fibers, is placed between the metal plates.
- the steel plates are made of No. 5 temper Aluminum killed) low carbon steel that meets AISA 1008 and ASTM A109 standards.
- the thickness of the core material for comparative examples 6 and 7 is about 0.30 mm, and about 0.44 mm, respectively, as shown in Table 1.
- Comparative Example 6 and 7 are compression molded using a positive mold at a temperature of about 250 c C and a load of about 12000 kg.
- the overall density of the composite panels is about 32-46 wt.% lower than the density of the steel used in the steel plates.
- the through-thickness electrical resistivity of comparative examples 6-7 is greater than 1x10 10 ⁇ -cm, indicating that these panels have insulating characteristics.
- stampable attempts to weld Comparative Examples 6-7 to a monolithic steel panel results in structure that do not weld together. These samples fail the weld test in that the weld is weaker than the panels being welded together.
- Examples 8 and 9 are composite materials prepared by compression molding a sandwich panel using the method described for Comparative Examples 6-7, except a core material including about 26.9 volume% of steel fibers and about 73.1 volume% nylon 12 is used.
- the steel fibers in the core material have an average diameter of about 3-1 O ⁇ m and an average length of about 2-4 mm and are mixed with the nylon 12 in a Brabender Plastograph mixer at about 260 0 C.
- the thickness of the core material is about 0.40 mm and about 0.57 mm for Examples 8 and 9, respectively. These samples are illustrated in Table 2.
- the overall density of the composite panels is about 29-36 wt.% lower than the density of the steel.
- These composite panels are welded to steel sheet having a thickness of about 0.8 mm using AC resistance welding (spot welding).
- Good welds i.e., welds that are stronger than the panels being welded, such that a weld button is obtained when the welded panels are separated by force
- a welding current of about 9.7 kA and 8 weld cycles, with a pressure of about 600 psi.
- These conditions are lower than those required for welding two monolithic sheets of 0.8 mm thick steel (12.9 KA, 15 weld cycles, 600 psi pressure).
- Each weld cycle is about 1/60 second and the welding parameters include a slope of about 1 cycle (i.e., about 1/60 second), a hold time of about 10 cycles (i.e., about 1/6 second) and a squeeze time of about 1 second.
- Examples 10 and 11 are composite materials prepared by compression molding a sandwich panel using the method described for Examples 8 and 9, except the metal plates have a thickness of about 0.30 mm each, and the samples are prepared with thickness of the core material of about 0.39 mm, and about 0.54 mm, respectively. These samples are illustrated in Table 2.
- the overall density of the composite panels is about 25-30 wt.% lower than the density of the steel.
- These composite panels are welded to steel sheet having a thickness of about 0.8 mm using AC resistance welding (spot welding). Good welds are obtained using a welding current of about 9.7 kA and 8 weld cycles, with a pressure of about 600 psi.
- Examples 12 and 13 are composite materials prepared by compression molding a sandwich panel using the method described for Comparative Examples 6-7, except a core material including about 20.2 volume% of steel fibers and about 79.8 volume% nylon 12 is used.
- the steel fibers in the core material have an average diameter of about 3-1 O ⁇ m and an average length of about 2-4 mm and are mixed with the nylon 12 in a Brabender Plastograph mixer at about 260 0 C.
- the thickness of the core material is about 0.37 and about 0.55 mm, for Examples 12 and 13 respectively. These samples are illustrated in Table 3.
- the overall density of the composite panels is about 31-41 wt.% lower than the density of the steel.
- These composite panels are welded to steel sheet having a thickness of about 0.8 mm using AC resistance welding (spot welding). Good welds are obtained using a welding current of about 9.7 kA and 8 weld cycles, with a pressure of about 600 psi.
- Example 12 The stiffness and density of Example 12 and a monolithic sheet of the same steel material used in the metallic layers of Example 12, both having a thickness of about 0.87 mm are measured in the through-thickness direction.
- Example 12 is expected to have a higher stiffness to density ratio than the monolithic sheet of steel.
- Example 14 composite material sample is prepared by compression molding a sandwich panel using the method described for Comparative Examples 6, except Example 3 is used for the core material. This composite panel sample is welded to steel sheet having a thickness of about 0.8 mm using AC resistance welding (spot welding). Good welds are obtained using a welding current of about 9.7 kA and 8 weld cycles, with a pressure of about 600 psi.
- Example 15 composite material sample is prepared by compression molding a sandwich panel using the method described for Comparative Examples 6, except Example 4 is used for the core material. This composite panel sample is welded to steel sheet having a thickness of about 0.8 mm using AC resistance welding (spot welding). Good welds are obtained using a welding current of about 9.7 kA and 8 weld cycles, with a pressure of about 600 psi.
- a composite panel having dimensions of about 340 mm x 540 mm and having the composition of Example 12 is prepared using a compression molding process.
- the composite panel is stamped such that sections of the panel have a draw ratio of about 3. After stamping it is expected that the panel is free of cracks and wrinkles and has a class A surface. It is further expected that the metallic fibers do not tear and the core layer does not delaminate from the metallic layers.
- Examples 17-19 are neat polymers and mixtures of polymers with stainless steel fibers prepared using the method Example 1.
- Examples 17-19 are prepared using nylon 6 with about 0 wt%, about 3 wt.%, and about 10 wt.% stainless steel fiber, respectively for Examples 17, 18, and 19.
- the tensile modulus of the core material of Example 17 is about 3.3 GPa.
- the steel fiber is added at a concentration of about 3 wt.% (Example 18)
- the tensile modulus increases by more than 17% to about 3.9 GPa.
- the steel fiber is added at a concentration of about 10 wt.% (Example 19)
- the tensile modulus increases by more than 100% to about 7.3 GPa.
- the nylon is replaced with a copolyamide and the concentration of the stainless steel fiber is about 0% wt.%, about 3 wt.% and about 10 wt.% for Examples 20, 21 , and 22, respectively.
- the tensile modulus of the core material of Example 20 is about 700 MPa.
- the steel fiber is added at a concentration of about 3 wt.% (Example 21)
- the tensile modulus increases by more than 50% to about 1160 MPa.
- the steel fiber is added at a concentration of about 10 wt.% (Example 22)
- the tensile modulus increases by more than 200% to about 2280 MPa.
- the nylon is replaced with an ethylene vinyl acetate copolymer containing about 19 wt.% vinyl acetate and about 81 wt% ethylene, and the concentration of the stainless steel fiber is about 0% wt.%, about 3 wt.% and about 10 wt.% for Examples 23, 24, and 25, respectively.
- the neat ethylene vinyl acetate copolymer (Example 23) has a tensile modulus of about 40 MPa, an elongation at failure of about 680%, and a toughness of about 36 MPa.
- the tensile modulus increases by more than 100% to about 110 MPa, the elongation at failure remains about the same at about 680 %, and the toughness increases to about 47 MPa.
- the steel fiber is added at a concentration of about 10 wt.% (Example 25)
- the tensile modulus increases by more than 400% to about 210 MPa, the elongation at failure is about 70%, and the toughness is about 3 MPa.
- this and other embodiments of herein may be characterized by a tensile modulus of the filled polymeric material (e.g., the material of the core layer) including metallic fibers that is greater than the tensile modulus of the filled polymeric material (e.g., the material of the core layer) having the same composition but without metallic fibers preferably by at least 15%, more preferably by at least 50%, even more preferably by at least about 100%, and most preferably by at least about 200%.
- a tensile modulus of the filled polymeric material e.g., the material of the core layer
- metallic fibers that is greater than the tensile modulus of the filled polymeric material (e.g., the material of the core layer) having the same composition but without metallic fibers preferably by at least 15%, more preferably by at least 50%, even more preferably by at least about 100%, and most preferably by at least about 200%.
- a composite sandwich sheet is prepared including low carbon steel face sheets and a composite layer including about 20 volume% stainless steel fibers and about 80 volume % nylon.
- the composite material is spot welded to a metal sheet made of low carbon steel.
- the welding conditions include a squeeze time of about 60 cycles (each cycle being about 1/60 second), a slope of about 1 cycle, a weld time of about 13 weld cycles, a current of about 5 kA, and a hold time of about 10 cycles.
- the weld joint is sectioned, polished and studied by microscopy, microhardness, and energy dispersive x-ray spectroscopy (EDS).
- FIGS. 3A, 3B, and 3C are micrographs illustrating different regions and/or different magnifications of the sectioned weld joint.
- the EDS and the microhardness show that the carbon concentration of the first metallic layer has essentially no variation (e.g., between regions 32, 40, 41 , and 42), except for a small amount of stainless steel near the weld zone 32.
- the EDS and microhardness studies show that the metallic region 38 near the weld zone consists essentially of stainless steel (i.e., the steel used in the metallic fibers).
- the microstructure of the first metallic layer is representative of bainite and includes ferrite. In other regions, away from weld (e.g., at the location marked by 40), the first metallic layer has pure ferrite grains.
- Examples 27 through 34 are prepared by mixing steel fibers to a thermoplastic using the steel fiber concentration shown in TABLE 4 in a Brabender mixer. The composite materials are then prepared by molding sandwiches having 0.4 mm of the fiber filled thermoplastic layer between two 0.2 mm thick steel sheets. The through-thickness electrical resistivity of the composite materials, as measured using AC Modulation, is shown in TABLE 4. All of the composite materials filled thermoplastics have relatively low electrical resistivity and all of the unfilled thermoplastics have relatively high electrical resistivity.
- any member of a genus may be excluded from the genus; and/or any member of a Markush grouping may be excluded from the grouping.
- any numerical values recited herein include all values from the lower value to the upper value in increments of one unit provided that there is a separation of at least 2 units between any lower value and any higher value.
- the amount of a component, a property, or a value of a process variable such as, for example, temperature, pressure, time and the like is, for example, from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70
- intermediate range values such as (for example, 15 to 85, 22 to 68, 43 to 51 , 30 to 32 etc.) are within the teachings of this specification.
- individual intermediate values are also within the present teachings.
- polymer and polymerization are generic, and can include either or both of the more specific cases of “homo-” and copolymer” and “homo- and copolymerization”, respectively.
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Abstract
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CN200980142176.8A CN102186666B (en) | 2008-08-18 | 2009-08-13 | Formable light weight composites |
EP09791472.5A EP2328749B1 (en) | 2008-08-18 | 2009-08-13 | Formable light weight composites |
KR1020117006179A KR20110048052A (en) | 2008-08-18 | 2009-08-13 | Moldable lightweight composite |
JP2011523874A JP2012500142A (en) | 2008-08-18 | 2009-08-13 | Formable lightweight composite |
CA2734738A CA2734738C (en) | 2008-08-18 | 2009-08-13 | Formable light weight composites |
KR1020177009281A KR101834288B1 (en) | 2008-08-18 | 2009-08-13 | Formable light weight composites |
KR1020187005577A KR101953727B1 (en) | 2008-08-18 | 2009-08-13 | Formable light weight composites |
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CN102186666B (en) | 2015-06-24 |
US7927708B2 (en) | 2011-04-19 |
JP6544591B2 (en) | 2019-07-17 |
KR20180026553A (en) | 2018-03-12 |
KR101834288B1 (en) | 2018-03-06 |
KR20110048052A (en) | 2011-05-09 |
US8540842B2 (en) | 2013-09-24 |
CN105034482B (en) | 2017-08-25 |
CN105034482A (en) | 2015-11-11 |
US9889634B2 (en) | 2018-02-13 |
KR20170041286A (en) | 2017-04-14 |
US20160339675A1 (en) | 2016-11-24 |
EP2328749A1 (en) | 2011-06-08 |
JP2012500142A (en) | 2012-01-05 |
US9434134B2 (en) | 2016-09-06 |
EP2328749B1 (en) | 2019-09-25 |
CA2734738A1 (en) | 2010-02-25 |
US20110162788A1 (en) | 2011-07-07 |
JP2017074787A (en) | 2017-04-20 |
KR101953727B1 (en) | 2019-03-05 |
US20100040902A1 (en) | 2010-02-18 |
JP2015006802A (en) | 2015-01-15 |
JP6053732B2 (en) | 2016-12-27 |
US20140162086A1 (en) | 2014-06-12 |
CA2734738C (en) | 2019-05-07 |
CN102186666A (en) | 2011-09-14 |
US20180126700A1 (en) | 2018-05-10 |
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