Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
  • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
  • C23C4/06—Metallic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C24/00—Coating starting from inorganic powder
  • C23C24/02—Coating starting from inorganic powder by application of pressure only
  • C23C24/04—Impact or kinetic deposition of particles
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C24/00—Coating starting from inorganic powder
  • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
  • B22F2998/10—Processes characterised by the sequence of their steps
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
  • C22C2026/002—Carbon nanotubes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T50/00—Aeronautics or air transport
  • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
  • Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component

Definitions

• CNT carbon nanotubes
• CNT carbon nanotubes
• the CNTs are fullerenes and are carbon modifications with closed polyhedral structure.
• Known fields of application for CNTs are found in the field of semiconductors or for improving the mechanical properties of conventional plastics (www.de.wikipedia.org under "carbon nanotube”).
• EP 0 411 577 discloses a hypereutectic aluminum alloy which is sprayed out of a first nozzle in the molten state by the ospray process, solid silicon particles or graphite particles, optionally as Si metal or graphite metal compound, also being sprayed from another nozzle without segregating them and which are thereby applied to a carrier device and solidify there to form a block of a duplex aluminum alloy.
• DE 43 08 612 A1 discloses the production of an aluminum duplex alloy with boron contents, with good properties such as deformability, corrosion resistance and heat resistance, etc. The boron is, for example, by means of a powdery carrier material using an additional spray jet in the spray of the melt of the remaining alloying constituents or applied directly to the Sprühgutlini in a Sprühkompaktiervorraum.
• Object of the present invention is to expand the field of application of CNT and to suggest new materials and moldings thereof.
• the object is achieved by the invention by a duplex aluminum material of the aforementioned type and a method for producing a duplex aluminum material as a combination of two materials with different properties.
• the invention is based on a duplex aluminum material based on aluminum with a first phase and a second phase according to the aforementioned type - A -
• the second material component is formed in the form of an aluminum-based composite material comprising aluminum and / or an aluminum-based alloy on the one hand and a non-metal-containing material on the other hand, the first material component being compared to the second material component, respectively has separate material, higher ductility and / or lower tensile strength.
• the non-metal is formed in the form of CNT. It has been shown in an advantageous manner that the spray-compacting process can preferably be carried out in the form of an ospray process.
• the invention is based on the idea of combining two or more different alloys to form a so-called aluminum-duplex alloy.
• an alloy preferably that with high ductility or also pure aluminum, e.g. melted in a crucible and sprayed through a nozzle.
• the alloy with the high tensile strength is sprayed in powder form.
• the step of spray compaction in the manufacturing process according to the concept of the invention may have different developments.
• the step of spray compacting can be carried out with a single spray whose carrier substance is formed by the first material component, the second material component being sprayed in powder form into this spray jet.
• the step of spray compacting can also be carried out with two different spray jets.
• a first spray jet can be used for merely the first material component in the form of an aluminum-based alloy on a substrate to form a compact specimen, for example in the form of a bolt or billet or the like. to raise.
• the second spray can be used in this development to deposit the second material component on the substrate.
• the first spray jet would be used almost exclusively for introducing the first material component
• the second spray jet is used almost exclusively for introducing the second material component.
• the incorporation of the second material component takes place works similar to the previously genann ⁇ th training, namely in that in the formed of pure aluminum or an aluminum alloy support of the second spray, the alloy having the high tensile is sprayed in powder form. In this development, a powdered entry of the alloy with high tensile strength in the first spray is not provided.
• the first spray jet can certainly also be used to deposit the second material component on the substrate by spraying the alloy with the high tensile strength in powder form into the first spray jet.
• the amount of high tensile strength alloy sprayed in powder form into a first and / or second spray may be different.
• the Ospray method it is now possible to deposit layer by layer on top of one another on the substrate so that over time a compact sample body is formed as a combination of the two different alloys.
• the mixing ratio can be adjusted by varying the delivery rate of the sprayed powder.
• Fig. 4 is a duplex aluminum structure.
• the bright parts are the high-strength structural components with integrated CNT, the dark parts represent the soft structural components.
• nanoparticles eg CNT reinforced aluminum alloys.
• CNT nanoparticles
• These alloys are opposite pure aluminum depending on the CNT concentration a much higher tensile strength (eg factor 5) but at the same time also depending on the CNT concentration a reduced ductility.
• both material properties are also influenced by other process parameters, such as the material temperature during production. It is thus possible to set a range of possible tensile / ductility combinations for a specific aluminum alloy by varying these process parameters.
• a particularly preferred first material component has, again in the present case as a separate material, a lower tensile strength than the second component and a higher maximum elongation - that is in particular the softer material component.
• the second material component has a higher tensile strength and a lower maximum elongation, i. Ductility - in particular, is the harder material component.
• This second material component has proven to be particularly easy to produce, in particular using CNT and is also particularly suitable in combination with the first material component for forming a duplex aluminum material.
• the tensile strength of the first material component is less than 100 MPa and at the same time there is a maximum elongation of more than 15%.
• at least one of the parameters, tensile strength or elongation may be within the stated limits.
• a first material component has proven, in which a tensile strength is below 70 MPa and a maximum elongation is more than 20%.
• only one of the parameters, tensile strength or elongation is within the limits mentioned.
• the second material component may advantageously be provided with a tensile strength of more than 500 MPa and at the same time with a maximum elongation (ductility) of less than 3%.
• at least one of the parameters, tensile strength or elongation may be within the stated limits.
• a second material component has proven, in which a tensile strength is above 1000 MPa and a maximum elongation (ductility) of less than 1% is present.
• only one of the parameters, tensile strength or elongation is within the limits mentioned.
• the first material component is in the form of pure aluminum or in the form of an aluminum alloy, each with unavoidable impurities and / or additives.
• the second material component has proven in a particularly preferred embodiment, especially in the form of a mixture, preferably intimate mixture of pure aluminum and / or an aluminum-based alloy on the one hand and CNT on the other hand.
• the intimate mixture is preferably carried out in the form of a mixture formed by mechanical alloying. Particularly preferred mechanical alloying methods will be described in detail below.
• first and / or the second material component according to the concept of the invention or a further development thereof can expediently have a further constituent, which can be chosen advantageously depending on the case of use.
• Another component may in particular be a plastic and / or a polymer and / or a highly heat-resistant component. It has been found that highly heat-resistant constituents can be formed, for example, in the form of a graphite and / or silicon constituent. A SiC component and / or an Al 2 O 3 component has also proved to be particularly suitable.
• the concept can be implemented by materials comprising at least one metal and / or at least one polymer, in particular layered layers, alternately with layers of CNT.
• the second material component is advantageously present in granular form or in the form of particles, the particle size of 0.5 .mu.m to 2000 .mu.m, advantageously from 1 .mu.m to 1000 .mu.m.
• the individual plies or layers of the metal or polymer may have a thickness of 10 nm to 500'0OO nm, preferably from 20 nm to 200 nm 1 OOO.
• the thicknesses of the individual layers or plies of the CNT can range from 20 nm to 50 nm 1 OOO be from 10 nm to 100 nm 1 OOO advantageous.
• Suitable metals are metals, such as iron and non-ferrous metals and precious metals.
• Suitable ferrous metals are iron, cobalt and nickel, their alloys and steels.
• the non-ferrous metals aluminum, magnesium and titanium etc. as well as their alloys can be enumerated.
• metals may be mentioned vanadium, chromium, manganese, copper, zinc, tin, tantalum or tungsten and alloys thereof or the alloys brass and bronze. It is also possible to use rhodium, palladium, platinum, gold and silver.
• the metals mentioned can be sorted or mixed with one another.
• Aluminum and its alloys are preferred Trains t. In addition to pure aluminum, the alloys of aluminum are preferred.
• the metal is used in granular or granular or powder form in the process according to the invention.
• Typical grain sizes of the metals are from 5 .mu.m to 1000 .mu.m and suitably from 15 .mu.m to 1000 .mu.m.
• Suitable polymers are thermoplastic, elastic or thermosetting polymers.
• examples are polyolefins, such as polypropylene or polyethylene, cycloolefin copolymers, polyamides, such as the polyamides 6, 12, 66, 610 or 612, polyesters, such as polyethylene terephthalate, polyacrylonitrile, polystyrenes, polycarbonates, polyvinyl chloride, polyvinyl acetate, styrene-butadiene copolymers , Acrylonitrile-butadiene copolymers, polyurethanes, polyacrylates and copolymers, alkyd resins, epoxides, phenol-formaldehyde resins, urea-formaldehyde resins, etc.
• the polymers are sorted or mixed with each other or in admixture with metal, granular or in granular or powder form in the present invention Method used.
• Typical particle sizes of the polymers are from 5 .mu.m to 1000 .mu.m and suitably from 15 .mu.m to 1000 .mu.m.
• the CNTs can be single-walled or multi-walled, such as double-walled.
• the CNTs can be open or closed tubes.
• the CNT may, for example, of 0.4 nm (nanometers) to 50nm in diameter and a length of 5 nm to 50 nm 1 OOO.
• the CNTs may also be sponge-like structures, ie 2- or 3-dimensional frameworks, of mutually cross-linked carbon nanotubes.
• the diameter of the individual tubes thereby moves in the above-mentioned range of, for example, 0.4 nm to 50 nm
• Extent of the sponge structure ie the side lengths of a framework body of CNT, can be given by way of example with 10 nm to 50 1 000 nm, advantageously with I 1 000 nm to 50'0OO nm, in each of the dimensions.
• the material according to the present invention may contain, for example, from 0.1 to 50% by weight, based on the material, of CNT. Suitably, amounts of 0.3 to 40 wt .-%, preferably from 0.5 to 20 wt .-% and in particular 1 to 10 wt .-% CNT contained in the material. If aluminum or an aluminum alloy is the metal of the material, the material may suitably contain 0.5 to 20% by weight of CNT, based on the material, with 3 to 17% by weight of CNT being preferred and 3 to 6% by weight. % CNT are particularly preferred.
• the materials may consist of said metals and said CNT, they may consist of said metals, polymers and CNT, or may consist of the said polymers and CNT, or the above-mentioned materials may contain additional admixtures, for example functional admixtures.
• Functional additives are, for example, carbon, soot, graphite and diamond modification, glasses, fibers of carbon, plastic fibers, inorganic fibers, glass fibers, silicates, ceramics, carbides or Nitri ⁇ de of aluminum or silicon, such as aluminum carbide, aluminum nitride, silicon carbide or silicon nitride, for example in fiber form, so-called whiskers.
• the inventive duplex aluminum material can be produced by mechanical alloying (mechanical alloying) of the respective proportions of metal, polymer and CNT provided for the second material component.
• Mechanical alloying can be carried out by repeated deformation, breaking and welding of powdery particles of the metal or polymer and the CNT.
• particularly suitable for mechanical alloying are ball mills with high-energy ball collisions. A suitable energy input is achieved for example in ball mills whose grinding chamber has a cylindrical, preferably circular-cylindrical, cross-section and the grinding chamber, as a rule, is arranged in a horizontal position.
• the cams may, for example, extend over 1/10 to 9/10, preferably 4/10 to 8/10, of the radius of the grinding chamber.
• a rotary body which extends over the entire extent of the grinding chamber in the cylinder axis.
• the rotary body is, as well as the grinding chamber, driven independently or synchronously, set by an external drive in motion.
• the grinding chamber and the rotating body can rotate in the same direction or preferably in opposite directions.
• the grinding chamber can be evacuated and the grinding process can be operated in a vacuum or the grinding chamber can be filled and operated with a protective or inert gas. Examples of Protective gases are, for example, N 2 , CO 2 , of inert gases He or Ar.
• the grinding chamber and thus the ground material can be heated or cooled. Case by case can be cryogenically ground.
• Typical is a grinding time of 10 hours and less.
• the minimum grinding time is appropriately 15 min.
• a milling time between 15 minutes and 5 hours is preferred.
• Particularly preferred is a grinding time of 30 minutes to 3 hours, in particular up to 2 hours.
• materials with a preferred distribution of the layers of metal or polymer and CNT can be produced.
• the thickness of the individual layers can be changed.
• the thickness of the CNT structure fed to the milling process can be used to control the thickness of the CNT layers in the milled material.
• the thickness of the individual layers can be reduced and the respective position can be increased with respect to the expansion in the area. Due to the increasing expansion in the surface, for example, individual layers of CNT can touch each other up to two-dimensional continuous CNT layers or throughout in two dimensions touching CNT layers through a particle. This makes it possible to substantially maintain the excellent properties of the CNT, for example the thermal conductivity and the electrical conductivity of the CNT, on the one hand and the ductility of the metal or the elasticity of the polymer on the other hand in the second material component.
• Further control of the properties of the second material component can be achieved by mixing two or more materials of different starting material and / or energy input during their production.
• materials such as metal or plastic, free of CNT, and one or more CNT-containing materials may be mixed or mechanically alloyed, i. be ground.
• the different materials occasionally with the materials, can be mixed or subjected to a second grinding or several grinding operations.
• the second refining or subsequent refining may take a grinding time of 10 hours or less.
• the minimum time of the second grinding is appropriate min.
• a second grinding time is between 10 minutes and 5 hours.
• Particularly preferred is a second grinding time of 15 minutes to 3 hours, in particular up to 2 hours.
• a second material component high CNT content and a material lower CNT content or materials different energy input are processed in a second grinding process.
• a CNT-containing material such as a CNT-containing metal, for example aluminum
• a CNT-free metal for example, also aluminum
• the mechanical alloying is carried out only to the extent that the resulting material is not completely homogenized, but the inherent properties of any material or material are retained and supplement the effects in the final material.
• the second material component finds e.g. Use in shaped articles, including semi-finished products and layers produced by spray compacting, thermal spraying, plasma spraying, extrusion processes, sintering processes, pressure-controlled infiltration processes or compression molding.
• the present second material component can therefore be processed, for example, by spray-compacting into shaped bodies.
• a molten metal melt for example a steel, magnesium or preferably aluminum or an aluminum alloy
• a spray head via a heated crucible, where it is atomized to form fine droplets and sprayed onto a substrate or base.
• the initially still molten droplets cool during the flight from the atomizer to the lower substrate.
• the particle flow hits there at high speed to the so-called To grow up deposit and thereby completely freeze and continue to cool.
• the special phase transition "liquid-to-solid", which grows together to form a closed composite of materials, is used for the shaping process in the present case where the second material component containing the CNT is fed to the atomizing device in powder form
• the process is such that the CNT-containing materials are not or only at the surface melted and no segregation occurs.
• the particle flow of material and metal droplets impinges on the substrate at high speed on
• solid bodies such as bolts
• hollow bodies such as pipes or strips of material, such as sheets or profiles, can be produced as shaped bodies a mixture of metal with embedded CNT with the desired uniform arrangement of the constituents in the structure.
• Spray processes are powdered materials in one
• the CNT-containing second material component can alternatively or additionally be further processed by extrusion processes, sintering or die casting process to give moldings.
• extrusion processes sintering or die casting process
• a slow, in particular laminar, continuous mold filling at high metal pressures is desired.
• composite materials can be produced by infiltration of porous fiber or particle shaped bodies by a liquefied metal.
• the second material component from which the metals containing the CNT in a casting mold as a powdery matrix material, expediently becomes submitted. It is a metal whose melting point is lower than that of the material, for example, in aluminum-containing materials, a metal having a melt temperature of below 750 0 C, slowly pressed into the heated mold. The liquid metal penetrates the powdered matrix material under the applied pressure. Thereafter, the mold can be cooled and the molding removed from the mold. The process can also be carried out continuously.
• the metal eg aluminum
• the CNT can be incorporated.
• a preheated metal in the thixotropic (partly liquid / partly solid) state, containing the CNT can be pressed into the casting mold.
• coarsely mixed metal powders such as aluminum powder or aluminum having thixotropic properties, and CNT, the CNT in sponge form or as clusters having a diameter of, for example, up to 0.5 mm
• coarsely mixed metal powders such as aluminum powder or aluminum having thixotropic properties, and CNT, the CNT in sponge form or as clusters having a diameter of, for example, up to 0.5 mm
• Moldings for example rod-shaped moldings, batchwise or continuously, can be produced at low pressure using the pressure casting methods.
• Aluminum with thixotropic properties is obtainable, for example, by melting aluminum or aluminum alloys and rapid cooling with constant stirring until solidification.
• the two ⁇ te beam may be an identical with the first beam beam - in other words, the first component and the second component when needed can be supplied in common example of a spray nozzle to represent a single spray during spray.
• a second beam separately formed by the first is used to supply the second material component to the first beam.
• both or one of the jet may be formed as a spray jet.
• the first and the second beam may be collinear or be provided as needed at a certain angle to each other.
• the first material component is introduced in the molten state into the first jet.
• the first material component for example by spraying through a nozzle as liquid droplets, can be introduced into the first jet.
• the second material component can be introduced in a preferred manner in the powdery state in the second jet.
• a particulate state of the second material component preferably as a nanoparticle, is suitable for this purpose.
• Such and similar particles can be particularly preferably prepared according to one of the grinding methods described above.
• the arrangement of a first and a separate second jet provided according to this further embodiment ensures, above all, the introduction of the second component, without a segregation of, for example, nanoparticles with an aluminum component. Matrix, can be done.
• the sprayed particles are briefly melted in the hot cloud of, for example, liquid droplets of the first material component, homogeneously mixed and deposited after a comparatively short flight time together on a substrate where the material immediately solidifies in the form of duplex aluminum material.
• the aluminum duplex materials and moldings show good thermal conductivity and electrical conductivity.
• the temperature behavior of moldings of the materials according to the invention is outstanding.
• the thermal expansion is low.
• the creep strain improves.
• CNT to the metals, such as aluminum
• a substantial refinement of the grain structure to, for example, 0.6-0.7 Fm can be observed.
• the addition of CNT to the metals can influence recrystallization of the metal, resp. prevent. Crack propagation can also be reduced or prevented by the CNT in the metal.
• An inventive material is characterized in particular by a high heat resistance.
• FIGS. 1 to 9 of the drawings are as follows:
• Fig. 1 shows an illustrative scheme illustrating the possibility of a massive increase in the tensile strength of an aluminum-based composite with CNT compared to pure aluminum;
• FIG. 2 shows a schematic representation of a spray compacting device for applying a Duplex aluminum material according to the concept of the invention
• FIG. 3 shows a schematic explanatory illustration of the flight phase of the first material component in FIG.
• FIG. 4 shows an exemplary micrograph of a duplex aluminum microstructure in a particle of a second material component in the form of an Al / CNT composite with clearly recognizable CNT phases within the aluminum matrix;
• Fig. 9 show the starting materials and finished material components viewed through a microscope, each at high magnification
• Fig. 5 shows a mixture of aluminum particles and CNT agglomerates prior to mechanical alloying to form a preferred second material component in magnification.
• the bright aluminum particles are denoted by (1).
• Fig. 6 shows in enlargement a preferred second material component in powder or particle form after mechanical alloying. There are no visible CNTs. All CNTs are contained in the aluminum particles, which have been deformed, broken and welded many times;
• Fig. 7 shows the section through a particle of a preferred second material component in the form of an Al / CNT composite. Within the particle of the material is a layer structure, resp. they are layers, recognizable. These are the layers or layers of mutually gray aluminum aluminum tinted in the picture and light / dark line-shaped deposits of CNT visible;
• FIG 8 shows the section through another particle of a preferred second material component in the form of an Al / CNT composite.
• a particle of the material Within a particle of the material is a layer structure, resp. they are layers, recognizable. These are the ones
• FIG. 9 shows a sponge structure made of CNT, as it can be used, for example, for the production of presently inventive materials in an electron micrograph. Also can be used such a sponge structure, for example in the pressure casting process;
• FIG. 10 schematically illustrates the fundamental processes of breaking, stacking and welding occurring during mechanical alloying, which in the case of high-frequency multiple repetition in the context of a high-energy milling process becomes a so-called
• FIG. 11 shows a schematic representation of a further embodiment of a spray compacting device for applying a duplex aluminum material according to the concept of the invention
• Fig. 12 shows a volume fraction effect of hard and soft components in terms of tensile strength and elongation versus percent by volume of the hard material in percent of the finished duplex aluminum material;
• Fig. 15 shows a typical plan view image from an electrostatic ⁇ nenmikroskopischen intake in a tensile test of a tie-rod produced from the inventive duplex aluminum material.
• Example 1 is a comparative experiment with pure aluminum, without CNT.
• the tensile strength and hardness each increased by about 400%.
• the values can be controlled by the content of CNT in the material and the grinding process, such as the grinding time, for the production of the material.
• the modulus of elasticity can increase by 80%.
• the modulus of elasticity can be affected by the milling time during mechanical alloying in the production of the material and by the processing temperature in the extrusion process.
• FIG. 1 shows a number of tensile strength / ductility curves relating to a second material component in the form of an intimate mixture of an Al / CNT composite compared to pure aluminum (Al + 0% CNT).
• the tensile strength representing highest points of such curves are referred to herein as "stress / strain limit" and show that, for example, in the case of an aluminum-based composite with 8% CNT (Al + 8% CNT), the tensile strength of such a composite is almost a factor of 5 above the tensile strength of pure aluminum.
• tensile strength values with lower CNT contents are achievable (eg Al + 6% CNT or Al + 4% CNT) in which composites it is also ensured that the ductility is nevertheless comparatively high.
• Aluminum-based composites with a lower CNT content also have the advantage that an extrusion temperature is comparatively low.
• FIG. 2 shows the diagram of a spray compacting apparatus 11, in which pure aluminum present in a crucible 12, for example, can be fed to a tundish 14 and then into a spray nozzle 15 atomizing the liquid to a first jet 16 with suitably selected droplets Be fed spray cone.
• a present, not shown - usually collinear or slightly angled slightly - separate beam sprays powder particles of the second material component, present in the form of a pure aluminum / CNT composite in the spray cone of the first spray jet 6.
• the cloud shown schematically in Fig. 3 from liquid pure aluminum droplets 17 and the composite of Al / CNT particles 18 in partially melted state 19 reach the substrate 21 with a suitable impact speed 20 and solidify there immediately to a sample body 22.
• FIG. 4 A micrograph of a particle of a second material component in the form of an Al / CNT composite for producing such a sample is shown in FIG. 4. This clearly shows in the light areas the microstructure identify the CNT parts within the aluminum plates. Such high-strength structural components with integrated CNT are surrounded by dark-recognizable parts of a soft microstructure made of pure aluminum. Overall, this provides an aluminum duplex material which combines a first material component with comparatively high ductility and low tensile strength with a second material component with comparatively low ductility and high tensile strength as a phase mixture.
• FIG. 10 illustrates the essential processes involved in a high energy milling process for mechanical alloying - namely welding, breaking and stacking - which ultimately lead to severe plastic deformation of the materials involved (severe plastic deformation).
• the high energy milling method to a mixture of preferably harder aluminum alloy with CNT material, this results in a very strong solidification of the materials involved by grinding and as a result to a particularly preferred second (harder) material component according to the concept of the invention ,
• the solidification takes place essentially according to the known HALL-PETCH relationship. This means that the smaller the diameter of the particles involved, the greater the maximum achievable tensile strength.
• the maximum achievable tensile strength P should be inversely proportional to the root of the particle diameter involved, with the validity of the relationship starting in any case for particle diameters below 1 ⁇ m.
• the high energy milling of aluminum materials such as pure aluminum or an aluminum alloy of relatively high hardness with CNT has not only the advantage illustrated in FIG. 10 that the CNT content is intimately incorporated into the aluminum material, but in addition there is the advantage that CNT serves as a grinding aid.
• the proportion of hitherto customary grinding aids, such as stearic acid or the like can thereby be reduced. be reduced or eliminated altogether.
• Fig. 11 shows - in a modification of a method shown schematically in Fig. 2 for producing a duplex aluminum material - schematically a manufacturing method in which two non-collinear spray jets 31, 32 are used for applying the first and second material components.
• two powder injectors 41, 42 are used for the powdery introduction of the second material component into a carrier jet 31, 32 made of liquid aluminum droplets 17.
• the angle between the first spray jet 31 and 32 - in this case by adjusting the second spray jet 32 - be changed.
• the amount of powder for introduction into the first and second spray jet 31, 32 can be adjusted as needed.
• the first spray jet 31 may be free of powder delivery, i. be fed only from aluminum material, such as pure aluminum or alloyed aluminum.
• Fig. 14 illustrates the fine, inhomogeneous, but even distribution of harder second material component and softer first material component in a finished duplex aluminum material.
• the hard phase of the duplex aluminum material can be seen in the bright areas.
• the soft phase of the duplex aluminum material is visible in the dark areas.
• FIG. 15 shows a typical crack pattern of a tensile layer shown in the upper part of FIG. 15 in the lower enlarged area.
• CNT-I and CNT-2 CNTs of different lengths embedded clearly in the aluminum material can be seen.
• the invention provides the processing of a composite material in particle or powder form, containing carbon nanotubes (CNT), wherein in the material, for example, a metal in layers in a thickness of 10 nm to 500 1 000 nm alternately with layers of CNT in a Thickness of 10 nm to 100 1 000 nm layered.
• the material is produced by mechanical alloying, ie by repeated deformation, breaking and welding of metal particles and CNT particles, preferably by ball milling, containing a grinding chamber and grinding balls as grinding media and a rotating body for generating high-energy ball collisions.
• a method is described in which a material of the composite material and an aluminum alloy with different properties are alloyed in a single ospray process.

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• 2008
  • 2008-07-18 WO PCT/EP2008/005883 patent/WO2009010297A1/de active Application Filing
  • 2008-07-18 BR BRPI0813517-7A2A patent/BRPI0813517A2/pt not_active Application Discontinuation
  • 2008-07-18 EP EP08784863A patent/EP2178664A1/de not_active Withdrawn
  • 2008-07-18 CA CA 2692959 patent/CA2692959A1/en not_active Abandoned
  • 2008-07-18 CN CN200880025078A patent/CN101754826A/zh active Pending
  • 2008-07-18 US US12/669,414 patent/US20100189995A1/en not_active Abandoned
  • 2008-07-18 JP JP2010516424A patent/JP2010533786A/ja active Pending

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