US20010046597A1 - Reactive multilayer structures for ease of processing and enhanced ductility - Google Patents
Reactive multilayer structures for ease of processing and enhanced ductility Download PDFInfo
- Publication number
- US20010046597A1 US20010046597A1 US09/846,422 US84642201A US2001046597A1 US 20010046597 A1 US20010046597 A1 US 20010046597A1 US 84642201 A US84642201 A US 84642201A US 2001046597 A1 US2001046597 A1 US 2001046597A1
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- reaction
- reactive structure
- compound
- reactive
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- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B23K1/00—Soldering, e.g. brazing, or unsoldering
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- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
- B23K20/165—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas involving an exothermic reaction of the interposed material
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Definitions
- This invention relates to reactive multilayer structures, and, in particular, to reactive multilayer structures that can be easily processed to produce ductile reaction products.
- Reactive multilayer coatings are useful in a wide variety of applications requiring the generation of intense, controlled amounts of heat in a planar region.
- Such structures conventionally comprise a succession of substrate-supported coatings that, upon appropriate excitation, undergo a self-propagating exothermic chemical reaction that spreads across the area covered by the layers. While we will describe these reactive coatings primarily as sources of heat for welding, soldering or brazing, they can also be used in other applications requiring controlled local generation of heat such as propulsion and ignition.
- the heat source may be external or internal to the structure to be joined.
- An external source is typically a furnace that heats the entire unit to be bonded, including the bodies (bulk materials) to be joined and the joining material.
- An external heat source often presents problems because the bulk materials can be sensitive to the high temperatures required for joining. The bulk materials can also be damaged in cooling from high temperatures due to mismatches in thermal contraction.
- Reactive multilayer structures which were subsequently developed, reduced the problems associated with reactive powder bonding. These structures are typically comprised of thin coatings that undergo exothermic reactions. See, for example, T. P. Weihs, Handbook of Thin Film Process Technology , Part B, Section F.7, edited by D. A. Glocker and S. I. Shah (IOP Publishing, 1998); U.S. Pat. No. 5,538,795 issued to Barbee, Jr. et al. on Jul. 23, 1996; and U.S. Pat. No. 5,381,944 to D. M. Makowiecki et al. on Jan. 17, 1995. As compared to reactive powders, reactive multilayer structures permit exothermic reactions with more controllable and consistent heat generation.
- the basic driving force behind such reactions is a reduction in atomic bond energy.
- the distinct layers mix atomically, generating heat locally. This heat ignites adjacent regions of the structure, thereby permitting the reaction to travel the entire length of the structure until all the material is reacted.
- the individual layer thickness in the foils defines the average diffusion distance that is required for materials to mix in these exothermic reactions.
- An exothermic reaction in a multilayer foil can self-propagate far more easily and far faster at room temperature than the same reaction in a powder compact because the layers are many orders of magnitude smaller than the powders.
- Individual layer thicknesses typically range from 1-1000 nm while typical powder diameters range from 10 to 100 ⁇ m. Consequently, reaction velocities in foils typically range from 1-30 m/s while reaction in powders range from 0.01 to 0.1 m/s.
- An additional advantage for multilayer foils is that the thicknesses of their individual layers are far more uniform, consistent, and controllable than diameters of corresponding powders.
- reaction properties are more easily controlled and modified.
- reactive foils are fully dense and free of contaminants at interfaces between its reactants
- reactive powder compacts are rarely fully dense and often contain many contaminants at reactant/reactant interfaces due, for example, to oxide coatings on the particles. Both the lack of full density and the presence of contaminants can limit reaction kinetics and velocities compared to reactive foils.
- Reactive foils that contain B, C, or Si also tend to be brittle and unstable.
- the amorphous layers of B, C or Si in these foils have a lower fracture toughness than the alternative Al layers, so the multilayer foils will be more susceptible to fracture and cracking during handling. This susceptibility makes cutting and patterning the foils difficult and raises the likelihood of unwanted ignition during handling due to fracture or cracking.
- foils based on B, C, or Si will also have lower thresholds for ignition, which also makes them more susceptible to unwanted ignition.
- the final reaction product is brittle at room temperature.
- future handling or use of this product whether in a joint, a propellant, or a combustion reaction, can be degraded.
- the presence of a brittle boride, carbide, silicide, or aluminide at the interface between the two components is bound to lower the fracture strength, fracture resistance, and fatigue resistance of the joint. Accordingly, there is a need for new reactive multilayer foils that can be easily processed and handled and can be easily used to produce ductile, reliable bonding.
- a reactive multilayer structure comprises alternating layers of materials that exothermically react by a self-propagating reduction/oxidation reaction or by a self-propagating reduction/formation reaction.
- This combination of a reduction reaction and either an oxidation or formation reaction can lead to ductile reaction products and is frequently accompanied by the generation of large amounts of heat.
- the new multilayer structures are easier to fabricate, easier to handle, and produce more reliable bonds.
- FIG. 1 is a schematic diagram of a reactive multilayer structure in accordance with the invention.
- FIG. 2 is a schematic diagram of a reactive foil with particle composite geometry in accordance with the invention.
- FIG. 3 illustrates bonding using the ductile metal reaction product of a multilayer structure as a joining material.
- a reactive multilayer structure (generically referred to herein as a “foil”) is provided as a local heat source in a variety of applications such as a process for joining materials together.
- the reactive foil ( 14 ) with a layered structure is made up of alternating layers 16 and 18 .
- the foil contains two materials, which in their simplest form consist of an element ⁇ and an oxide or compound ⁇ x , where ⁇ , ⁇ and ⁇ can designate any element and x can be an integer or a fraction.
- the foil will react by the element ( ⁇ ) reducing the initial oxide or compound ( ⁇ x ) and forming a more stable oxide or compound ⁇ y and the element ⁇ .
- This combination of a reduction and either an oxidation or a formation reaction leads to the release of heat.
- Examples include reactions wherein a reactive element like Al (or Si, Ti, Zr, or Hf) reduces an oxide with a low heat of formation (e.g., Fe 2 O 3 , CuO, or ZnO) and forms a metal (Fe, Cu, or Zn) plus an oxide, Al 2 O 3 (or SiO 2 , TiO 2 , ZrO 2 , or HfO 2 ) that has a very high heat of formation.
- a reactive element like Al (or Si, Ti, Zr, or Hf) reduces an oxide with a low heat of formation (e.g., Fe 2 O 3 , CuO, or ZnO) and forms a metal (Fe, Cu, or Zn) plus an oxide, Al 2 O 3 (or SiO 2 , TiO 2 , ZrO 2 , or HfO 2 ) that has a very high heat of formation.
- Examples also include a reactive element(s) such as Ti, (or Zr and Hf) that reduces a compound with a low heat of formation, such as NiB, and then subsequently forms a metal (Ni) plus a compound (TiB 2 , or ZrB 2 or HfB 2 which has a high heat of formation.
- a reactive element(s) such as Ti, (or Zr and Hf) that reduces a compound with a low heat of formation, such as NiB, and then subsequently forms a metal (Ni) plus a compound (TiB 2 , or ZrB 2 or HfB 2 which has a high heat of formation.
- FIG. 2 illustrates an alternate form of a reactive multilayer structure which we will call a composite particle foil 50 wherein one of the reactive materials is in the form of particles 52 (e.g. spheres, disks or fibers).
- the other reactive material can be in the form of layers establishing a matrix 54 for the particles.
- the structure 50 can use the same materials and the same reactions as the foil 14 of FIG. 1.
- the materials ( ⁇ / ⁇ x ) used in the reactive structures ( 14 , 50 ) are preferably chemically distinct.
- layers 16 , 18 ( 52 / 54 ) alternate between Al and an oxide with a low heat of formation (e.g., Fe 2 O 3 , CuO, or ZnO).
- layers 16 , 18 ( 52 , 54 ) alternate between a reactive early transition element such as Ti, Zr, or Hf and a boride, silicide, or carbide compound with a low heat of formation such as (NiB, FeB, FeSi, Cu 3 Si, Ni 3 C, Fe 3 C).
- layers 16 , 18 alternate between Pt, Pd or alloys of these elements and an aluminide compound with a low heat of formation such as (CuAl 2 , TiAl 3 )
- the initial compounds comprise metallic elements that are ductile such as Fe, Cu, or Ni, so that the final product consists of this ductile metal and a hard compound.
- the pairs of materials ⁇ , ⁇ x are chosen so that the reactions form stable compounds with large negative heats of reaction and high adiabatic reaction temperatures. These reactions will self-propagate in a manner similar to the formation reactions described in T. P. Weihs, “Self-Propagating Reactions in Multilayer Materials,” Handbook of Thin Film Process Technology (1997), which is incorporated herein by reference in its entirety.
- a multilayer structure 14 , 50 When a multilayer structure 14 , 50 is exposed to a stimulus (e.g., a spark or energy pulse) neighboring atoms from the two materials mix.
- a stimulus e.g., a spark or energy pulse
- the change in chemical bonding caused by this mixing results in a reduction in atomic bond energy, thus generating heat in an exothermic chemical reaction.
- This chemical bonding occurs as layers with ⁇ - ⁇ bonds (i.e., layer 16 , 52 ) and layers with ⁇ - ⁇ bonds (i.e., layer 18 , 54 ) are exchanged for ⁇ - ⁇ and ⁇ - ⁇ bonds, thereby reducing the chemical energy stored in the foil, and generating heat.
- the heat that is generated diffuses through foil 14 , 50 (in a direction from reacted section 30 through reaction zone 32 to unreacted section 34 ) and initiates additional mixing of the reactants.
- a self-sustaining/self propagating reaction is produced through the structure 14 , 50 .
- the reaction propagates across the entire structure 14 , 50 at velocities that can exceed 10 m/s.
- the reaction does not require additional atoms from the surrounding environment (as would, for example, oxygen in the case of combustion), the reaction makes foils 14 or 50 self-contained sources of energy capable of emitting bursts of heat and light, rapidly reaching temperatures above 1400 K and a local heating rate reaching as high as 10 9 K/s. This energy is particularly useful in applications such as propulsion, joining, and ignition requiring production of heat rapidly and locally.
- the maximum temperature of the reaction is typically located at the trailing edge of the reaction zone 32 .
- This may be considered the final temperature of reaction, which can be determined using the heat of reaction ( ⁇ H rx ), the heat lost to the environment ( ⁇ H env ), the average heat capacity of the sample (C p ), and the mass of the product (M).
- Another factor is whether or the not reaction temperature exceeds the melting point of the final product. If the melting point is exceeded, then some heat is absorbed in the state transformation from solid to liquid of at least part of the product.
- the final temperature of reaction may be determined using the following formulas (where T o is the initial temperature, ⁇ H mm is the enthalpy of melting of the final metallic phase, T m is the melting temperature of the final metallic phase in the product, ⁇ H mc is the enthalpy of melting of the final compound phase, and T mc is the melting temperature of the final compound phase in the product),
- T f T o ⁇ ( ⁇ H rx + ⁇ H env )/( C p M )
- T f T o ( ⁇ H rx + ⁇ H env + ⁇ H mm )/( C p M)
- T f T o ( ⁇ H rx + ⁇ H env + ⁇ H mm + ⁇ H mc )/( C p M )
- the propagation velocity is a strong function of the foil's multilayer thickness or average particle thickness. As the thickness of individual layers 16 , 18 (or particles 54 ) decreases, the diffusion distances are smaller and atoms can mix more rapidly. Heat is released at a higher rate, and, therefore, the reaction travels faster through the foil structure.
- Reactive foils typically have diffusion distances that range from 1-1000 nm while reactive powder compacts typically have diffusion distances that range from 10-100 ⁇ m. Hence, reaction rates and reaction velocities are many times faster in foils than in powder compacts.
- reactive multilayer foils 14 , 50 may be fabricated by physical vapor deposition (PVD), chemical vapor deposition, electrochemical methods, electroless methods, mechanical methods, or some combination of these methods.
- PVD physical vapor deposition
- a magnetron sputtering technique may be used to deposit the materials ⁇ / ⁇ x on a substrate (shown in FIG. 1 in dashed outline form as layer 35 ) as alternating layers 16 , 18 .
- Substrate 35 may be rotated over two isolated sputter guns in a manner well known in the art to effectuate the layering of materials ⁇ / ⁇ x into alternating layers 16 , 18 .
- the vapor streams from the two sputter guns or the two electron beam hearths are isolated from one another during deposition of a reactive multilayer foils 14 . This isolation reduces intermixing and unwanted reaction of the elements being deposited. It is important to isolate the two vapor streams from one another to prevent loss of the energy of the reaction during deposition.
- Substrate 35 is shown in dashed outline form to indicate that it is a removable layer that facilitates fabrication of the reactive foil 14 as a freestanding foil.
- Substrate 35 may be any substrate (e.g., Si, glass, or other underlayer) having the characteristics of providing sufficient adhesion so as to keep the foil layers on the substrate during deposition, but not too adhesive to prevent the foil from being removed from the substrate following deposition.
- an additional wetting layer (e.g., tin) may be used as an interface layer between the first layer of foil ( 16 or 18 ) and the substrate 35 to provide the necessary adhesive.
- tin additional wetting layer
- selection of the appropriate material ⁇ or ⁇ x as the first layer deposited on the substrate will ensure that the necessary adhesive requirements are met.
- the exemplary reactive foil would be deposited on a substrate such as Si with the first layer being Al deposited on the substrate.
- Al is preferably selected as the first layer in such case because Al will sufficiently adhere to Si during depositing, but will allow peeling off of the substrate after the foil is formed.
- a fabricated foil 14 may have hundreds to thousands of alternating layers 16 and 18 stacked on one another. Individual layers 16 and 18 preferably have a thickness ranging from 1-1000 nm. In a preferred embodiment, the total thickness of foil 14 may range from 10 ⁇ m to 1 m.
- Another preferred method of fabricating is to deposit material in a codeposition geometry. Using this method, both material sources are directed onto one substrate and the atomic fluxes from each material source are shuttered to deposit the alternate layers 16 and 18 . Again, care must be taken to isolate the two physically distinct atomic fluxes from each other.
- the degree of atomic intermixing of materials ⁇ / ⁇ x that may occur during deposition should be minimized. This may be accomplished by depositing the multilayers onto cooled substrates, particularly when multilayers 16 and 18 are sputter deposited. To the extent that some degree of intermixing is unavoidable, a relatively thin (as compared to the alternating unreacted layers) region of pre-reacted material 20 will be formed. Such a pre-reacted region 20 , nevertheless, is helpful in that it serves to prevent further and spontaneous reaction in foil 14 .
- the reactive foil 14 or 50 can have a layered or particle composite geometry. While a layered geometry will typically result from vapor deposition of a reactive foil, another preferred embodiment of this invention is the mechanical formation of ⁇ / ⁇ x reactive foils. In this method, sheets of ⁇ and ⁇ x are stacked, inserted in a removable protective jacket, and then deformed into a multilayer sheet, as by swaging and rolling. The jacket is then removed. This mechanical processing can result in either a layered or particle composite geometry and generally is less expensive than vapor deposition. For further detail concerning mechanical processing, see U.S. application Ser. No. ______, filed by M. Reiss et al. concurrently herewith and entitled “Method of Making Reactive Multilayer Foil and Resulting Product” which is incorporated here by reference.
- Reactive foils in accordance with the invention may be adapted for use in a variety of applications.
- the foils may be used to ignite another reaction that releases a signal, more heat, or a gas, as in a combustion or propulsion application.
- a freestanding foil can be inserted into a metastable material to be ignited, with all sides of the foil being covered by the metastable material.
- FIG. 3 illustrates another preferred application of the invention wherein the reactive structures react to form a ductile composite product 40 that contains particles 42 or layers of a hard oxide or compound in a matrix 41 of a ductile metal.
- the ductile metal 41 can be a simple element such as Cu, Ni, or Fe or it could be a ductile alloy of two or more elements.
- these reactive structures can be used in the joining of two bodies or components ( 43 , 44 ). In these applications, the reactive multilayer is positioned between the two bodies ( 43 , 44 ) to be joined, the bodies are pressed against the reactive multilayer, and the latter is ignited.
- the ductile metallic product 41 resulting from the self-propagating reaction can serve as a solder or braze that flows and wets the surfaces of the bodies, and consequently forms a strong joint.
- reactive multilayers described in the present invention essentially enable a braze-free room-temperature joining process. This process provides significant advantages over known reactive joining methods which require braze of solder material to be deposited on, or positioned next to the free-standing foil and/or on the surfaces of the components.
- the foils are fabricated using inexpensive materials such as Al and CuO, Fe 2 O 3 or ZnO. These materials are less expensive than many of the elements used to fabricate reactive foils with very exothermic formation reactions (as opposed to reduction/oxidation or reduction/formation reactions) such as Ti, Zr, Hf, or Nb.
- Preferred embodiments of the invention are useable as freestanding reactive foils 14 with increased total thickness.
- the total thickness of such a reactive foil depends upon the thickness and number of the elemental layers (e.g., 16 and 18 ) utilized to form the foils. Foils that are less than 10 ⁇ m are very hard to handle as they tend to curl up on themselves. Foils on the order of 100 ⁇ m are stiff, and thus, easily handled. Thicker foils also minimize quenching.
- In joining applications, for example, using reactive foils there is a critical balance between the rate at which the foil generates heat and the rate at which that heat is conducted into the surrounding braze layers and the joint to be formed. If heat is conducted away faster than it is generated, the reaction will be quenched and the joint cannot be formed. The thicker foils make it harder to quench the reaction because there is a larger volume generating heat and the same surface area through which heat is lost.
- Thicker foils can be utilized with reaction temperatures that are lower, generally leading to more stable foils. Foils with high formation reaction temperatures (as opposed to reduction/oxidation or reduction/formation temperature) are generally unstable and brittle and therefore are dangerous and difficult to use. Brittle foils, for example, will crack easily leading to local hot spots (through the release of elastic strain energy and friction) that ignite the foil. Cutting such brittle foils (e.g., for specific joint sizes) is very difficult to do as they are more likely to crack into unusable pieces or ignite during the cutting process.
- the thicker reactive foils are on the order of 10 ⁇ m to 1 cm.
- deposition conditions such as sputter gas and substrate temperature are advantageously chosen so that stresses remain sufficiently low in the films of the foil as they are grown in the system. Since the stress in the film times its thickness determines with the driving force for delamination, the product of stress and thickness should be kept below 1000 N/m. Stresses often arise in the films during the fabrication process.
- the films grow thicker, they are more likely to peel off their substrates or crack their substrates than thinner films, thereby ruining the final foil production.
- the fabrication process can be completed without the peeling off (or cracking) of the substrate.
- Electrodeposition of Cu from standard cupric sulphate solution is alternated, with electrodeposition of CuO (or Cu 2 O) from a 3 M copper lactate, 0.4 M cupric sulphate solution (pH>10 by addition of NaOH).
- the alternating layers can be fabricated either by moving the substrate from one bath to another or by draining and refilling the same bath with different solution. Rotation of the substrate during deposition and the suspension of a large volume percent of aluminum particles in the either or both solutions enables the aluminum particles to be incorporated in the electrodeposited matrix.
- the pH of the copper lactate solution can be modified such that Cu and CuO are deposited simultaneously.
- the oxygen content can be controlled by optimizing the pH, current density, and electrolyte concentrations.
- the aluminum particles can be 100 micron diameter down to 100 nm diameter. Cold rolling of the electrodeposited foils will create pancake structures with much smaller average diffusion lengths. Swaging will create oblong particles which can then be roll flattened for even further reduction in diffusion distances.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US09/846,422 US20010046597A1 (en) | 2000-05-02 | 2001-05-01 | Reactive multilayer structures for ease of processing and enhanced ductility |
US10/247,998 US6991856B2 (en) | 2000-05-02 | 2002-09-20 | Methods of making and using freestanding reactive multilayer foils |
US11/228,085 US20060068179A1 (en) | 2000-05-02 | 2005-09-16 | Fuse applications of reactive composite structures |
US11/342,450 US20070023489A1 (en) | 2000-05-02 | 2006-01-30 | Method of joining components using amorphous brazes and reactive multilayer foil |
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US20129200P | 2000-05-02 | 2000-05-02 | |
US09/846,422 US20010046597A1 (en) | 2000-05-02 | 2001-05-01 | Reactive multilayer structures for ease of processing and enhanced ductility |
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US09/846,447 Continuation-In-Part US6534194B2 (en) | 2000-05-02 | 2001-05-01 | Method of making reactive multilayer foil and resulting product |
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US09/846,486 Continuation-In-Part US6736942B2 (en) | 2000-05-02 | 2001-05-01 | Freestanding reactive multilayer foils |
US10/247,998 Continuation-In-Part US6991856B2 (en) | 2000-05-02 | 2002-09-20 | Methods of making and using freestanding reactive multilayer foils |
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US09/846,422 Abandoned US20010046597A1 (en) | 2000-05-02 | 2001-05-01 | Reactive multilayer structures for ease of processing and enhanced ductility |
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