95 results about "Intermetallic" patented technology

The invention discloses an anti-oxidation packaging material for hot rolling of thermoelectric materials and a preparation method of the anti-oxidation packaging material, and relates to the technical field of new materials. The packaging material is of a three-layer composite tubular structure and sequentially comprises, from inside to outside, an anti-oxidation barrier layer which is a composite material with an Fe-Al intermetallic compound as a matrix and Y2O3 particles dispersed and distributed; the transition layer is a Ni-Cr-Fe-Mn-C series solid solution alloy with Ni as a matrix; and the structure supporting layer is made of microalloyed low-carbon bainite steel. The layers are metallurgically bonded through hot isostatic pressing, and then the hollow composite pipe is manufactured through cold drawing. The packaging material has excellent high-temperature oxidation resistance, good plastic deformation capacity and structural strength, can effectively isolate oxygen, coordinate strain and maintain overall integrity in the high-temperature hot rolling process, is suitable for protection and densification of Bi2Te3-based, PbTe-based and SiGe-based thermoelectric materials and the like, and remarkably improves thermoelectric performance and production consistency of the thermoelectric materials.

The invention relates to the technical field of dissimilar material connection, in particular to a method for regulating and controlling molybdenum steel brazed joint intermetallic compounds based on transition elements. According to the technical scheme, the method comprises the following steps that a transition element coating is deposited on the surface of a molybdenum matrix, transition elements are selected from one or more of Ti, V, Nb, Zr, Hf and Ta, and the molybdenum matrix and a steel matrix are brazed through boron-containing Ni-based brazing filler metal; in the brazing process, the transition element and the boron element preferentially react to generate a transition element boride, and therefore generation of MoNiBintermetallic compounds is inhibited. According to the method, the transition element coating is introduced, a brazing interface reaction path is actively intervened and reconstructed from the thermodynamic angle, and the problem of continuous generation of the brittle MoNiBintermetallic compound in the molybdenum / steel brazing joint is fundamentally solved.

The invention discloses a high-entropy alloy foil strip and a laser welding method of a titanium alloy and an aluminum alloy, and belongs to the technical field of dissimilar metal laser welding machining, the high-entropy alloy foil strip is used as a dissimilar metal welding middle layer, and the chemical formula of the high-entropy alloy foil strip is TiaFe2aCo2aNi2aCub; wherein a and b both represent atomic proportionality coefficients, b is a continuous adjustable real number parameter in a [1, 3] interval, and 7a + b = 10. The high-entropy alloy foil strip system has uniqueness in element selection, the proportion of Ti, Fe, Co, Ni and Cu is optimized by combining a Miema model and the metallurgical compatibility of base metal, a stable FCC solid solution can be formed in the welding process, the wettability and the structure stability can be improved, and therefore it is ensured that the performance of a welded joint is improved. A high-entropy alloy foil strip middle layer is introduced between two base materials, the high-entropy effect and the hysteresis diffusion effect are utilized, chemical components of a joint are regulated and controlled, generation of brittle Ti-Al intermetallic compounds in a weld joint is restrained, and therefore the mechanical property of the welded joint is improved.

The invention provides a preparation method of a cobalt-based intermetallic carbide material and application of the cobalt-based intermetallic carbide material in a preparation method of an electrocatalytic nitrate reduction electrolytic tank or a zinc-nitrate battery. The preparation method of the cobalt-based intermetallic carbide material comprises the following steps that cobalt chloride hexahydrate, indium chloride tetrahydrate, dicyandiamide and ketjen black are ground and mixed and then put into a tubular furnace for thermal annealing reduction, and the cobalt-based intermetallic carbide material is obtained. According to the method, cobalt-based intermetallic carbide material Co3InC0.75 powder is prepared into slurry, the slurry is dropped on carbon paper to be used for an electro-catalysis reaction, the material strengthens nitrate adsorption and water decomposition and inhibits a hydrogen evolution reaction, and therefore the performance of electro-catalysis of nitrate reduction to produce ammonia is improved.

The application discloses a brazing method of magnesium / aluminum dissimilar metals, which comprises the following steps: pre-electroplating nickel on a magnesium alloy base material, connecting the prepared magnesium alloy with a nickel plating layer and an aluminum alloy by using an ultrasonic-assisted brazing method, and using a brazing filler metal SAC305. The method prevents the generation of Mg-Sn intermetallic compounds (IMCs) in the process of magnesium / aluminum dissimilar metal low-temperature brazing using a Sn-based brazing filler metal. After welding, the position of the original nickel plating layer is changed into a Cu-Ni solid solution, and no large block-shaped Mg2Sn IMC is found in the brazing seam. Compared with a joint without a plating layer, the shear strength of the magnesium / aluminum dissimilar metal brazing joint based on the nickel plating layer is greatly improved, and the joint strength is strengthened by the diffusion of the nickel element into the brazing seam in the welding process. In addition, the corrosion resistance of the magnesium alloy can be improved by plating nickel on the surface of the magnesium alloy, and the service life of the magnesium / aluminum component is prolonged.

Disclosed is a metal particle that includes a basal phase that contains Sn, an Sn—Cu alloy and Sb; and an intermetallic compound crystal that contains Sn, Cu, Ni, Ge, Si and Ti, included in the basal phase, the metal particle has a chemical composition given by 0.7 to 15% by mass of Cu, 0.1 to 5% by mass of Ni, 0.1 to 14% by mass of Sb, 0.001 to 0.1% by mass of Ge, 0.001 to 0.1% by mass of Si, 0.001 to 0.1% by mass of Ti, and the balance of Sn; the basal phase has a chemical composition given by 85 to 99.9% by mass of Sn, 5% by mass or less of Cu, and 0.1 to 14% by mass of Sb; and, at least parts of the basal phase and the intermetallic compound crystal form an endotaxial joint.

The embodiment of the present application relates to a kind of copper intermetallic compound porous materials and its preparation method and application, wherein, preparation method includes: metal Mg, Zn, Cu, M is mixed, is handled by induction smelting, and MgZnCuM alloy ingot is obtained;MgZnCuM alloy ingot is treated by spinning, and MgZnCuM precursor is obtained;MgZnCuM precursor is placed in gas phase de-alloying system and is treated by first vacuum heat treatment, and copper intermetallic compound porous material MgCuM is obtained;MgCuM has double continuous structure.The preparation method is simple and easy to operate, pore size is adjustable, and pore distribution is uniform, and the preparation process is environment-friendly and pollution-free.

This invention relates to transition layer materials and welding processes for welding dissimilar steel and aluminum materials, belonging to the field of welding technology. The transition layer material for welding dissimilar steel and aluminum materials of this invention comprises a copper layer, a copper alloy layer, and a zinc alloy layer arranged sequentially; the copper layer is adjacent to the steel base material, and the zinc alloy layer is adjacent to the aluminum base material; the copper content in the copper alloy layer is 62.0%-64.0%; the zinc content in the zinc alloy layer is 89.0%-91.0%; the mass ratio of the copper layer, copper alloy layer, and zinc alloy layer is (0.9-1.1):(2.3-2.7):(1.8-2.2). By sequentially setting the copper layer, copper alloy layer, and zinc alloy layer between the steel base material and the aluminum base material, a gradual transition from the steel base material to the aluminum base material is achieved, effectively avoiding the formation of brittle Fe-Al intermetallic compounds during direct welding, and enhancing the mechanical properties and durability of the welded joint.

The invention belongs to the field of preparation of high-performance metal structure materials, and particularly relates to a method for preparing a Ti2AlNb alloy based on spherical titanium alloy powder. Commercial spherical titanium alloy pre-alloyed powder containing at least two elements of Al, Zr, Mo and V and pure niobium powder are selected as base materials, the spherical powder, the pure niobium powder and pure aluminum powder are evenly mixed according to the designed atomic proportion, a densification path of vacuum sintering or spark plasma sintering after cold isostatic pressing is adopted for preparing a consumable electrode blank, and the consumable electrode blank is prepared into a self-consumable electrode. And finally, a Ti2AlNb-based alloy cast ingot is obtained through vacuum self-consuming electric arc melting. According to the invention, not only is the technical bottleneck of inevitable gravity segregation in the smelting process of the Ti-Al intermetallic compound with high Nb content broken through, but also a brand new material preparation technical route with low cost, high performance and high stability is constructed; an industrialization feasible scheme is provided for solving the bottleneck problem of short-time high-temperature light structural materials in the aerospace field.

The application provides a preparation method of an isotropic Ti2AlNb / TiAl-based interpenetrating composite material and belongs to the technical field of intermetallic compound-based composite materials. First, a plurality of Ti2AlNb reinforcing body skeletons in a TPMS configuration are designed by using a hidden function modeling; then, anisotropy of the TPMS configuration is studied by using finite element simulation; secondly, the Ti2AlNb reinforcing body skeleton in the TPMS configuration is prepared by using a selective laser melting process SLM; finally, the Ti2AlNb / TiAl-based interpenetrating composite material in the TPMS configuration is prepared by vacuum hot pressing sintering HPS. Thus, the strong anisotropy of a traditional fiber reinforced composite material in mechanical properties is avoided, good matching of the strength, plasticity and toughness of the composite material is realized, and a new idea and solution are provided for breaking through the application bottleneck of a TiAl in a thermal end part of a space power system.

The invention provides a method for designing a Reuleaux biangular tool and electrolytically machining a grid wallboard, and belongs to the technical field of electrolytic machining. In the process of electrolytic machining of a grid wall plate through a Reuleaux two-angle tool, the current density of the surface of a workpiece is in an intermittent state or a machining state, localized removal of materials is achieved, and the machining method comprises the following steps that according to the characteristics of a Reuleaux triangle fixed-width curve, the Reuleaux two-angle oval cathode tool is designed; the center of the tool is controlled to do regular eccentric rotation motion through planetary gear transmission, and the motion trail of the cathode tool forms a regular triangle localized electric field; a new intermittent electrolytic machining mode of the grid wall plate is formed along with the periodic turning-in / out of the machining area of the tool machining blade; the machining mode is beneficial to rapid and uniform crushing of a passivation film, and is suitable for precise machining of materials such as easily passivated titanium alloys and titanium-aluminum intermetallic compounds; electrolyte updating is facilitated, and temperature rise, bubbles and product aggregation are avoided; and the overcut phenomenon is avoided. By means of the method, high-quality electrolytic machining of the grid wall plate can be achieved.

The application discloses a size-controllable carbon-supported PtZn intermetallic compound electrocatalyst and a preparation method and application thereof, and belongs to the technical field of nanometer catalysts and preparation thereof.The electrocatalyst is a long-range ordered face-centered tetragonal structure PtZn intermetallic compound, Pt and Zn are arranged alternately in atomic layers, and the atomic ratio of Pt to Zn is close to 1:1; the long-range ordered structure not only makes the regulation of transition metals fully play, but also makes the chemical bond formed by Pt atoms more stable transition metal atoms, so that the transition metal atoms are not easy to be dissolved under acidic conditions, and the catalytic activity and stability are further improved. In the application, the size-controllable carbon-supported PtZn intermetallic compound electrocatalyst can be obtained without introducing a surfactant and a protective agent, and the preparation method has the advantages of simplicity and easy implementation.

This invention discloses an antioxidant encapsulation material for hot rolling of thermoelectric materials and its preparation method, relating to the field of new materials technology. The encapsulation material is a three-layer composite tubular structure, comprising, from the inside out: an antioxidant barrier layer, a composite material with Fe-Al intermetallic compounds as the matrix and dispersed Y2O3 particles; a transition layer, a Ni-Cr-Fe-Mn-C solid solution alloy with Ni as the matrix; and a structural support layer, a micro-alloyed low-carbon bainitic steel. Each layer is metallurgically bonded by hot isostatic pressing, and then cold-drawn to form a hollow composite tube. This encapsulation material exhibits excellent high-temperature oxidation resistance, good plastic deformation capacity, and structural strength. It can effectively isolate oxygen, coordinate strain, and maintain overall integrity during high-temperature hot rolling. It is suitable for the protection and densification of Bi2Te3-based, PbTe-based, and SiGe-based thermoelectric materials, significantly improving the thermoelectric performance and production consistency of thermoelectric materials.

The application discloses a kind of high-damping Fe-Mn series alloy materials, the component of alloy and the mass fraction of each component are as follows: Mn 16.5-17.5%, doping metal 0.5-0.8%, TiB2 0.02-0.03%, C0.01-0.015%, Si 0.015-0.02%, Fe remainder.The high-damping Fe-Mn series alloy material provided by the application, by optimizing the composition of alloy material and improving the process, using the method of combination of forging, stage solid solution and stage aging, the Fe-Mn series alloy material prepared has the comprehensive performance of high damping, high strength and good toughness;Add specific ratio of Ni, Zr, Mo doping metal and a small amount of TiB2, wherein, Ni improves the stacking fault energy, stabilizes austenite and solid solution strengthening, Zr and Mo form intermetallic compound to carry out precipitation strengthening and refine grain, TiB2 promotes grain refinement, C and Si affect the strength, plasticity and processing performance of alloy, synergistic effect of each element, the balance of high damping, high strength and good low-temperature toughness of Fe-Mn series alloy is realized.

The invention discloses a production method of a novel lightweight photovoltaic solder strip. The welding strip comprises a rare earth microalloyed aluminum-based core material, a copper coating layer and a tin coating layer, the aluminum-based core material contains at least one rare earth element of Ce, La and Y; the periphery of the aluminum-based core material is coated with the copper coating layer, and a Cu-Al intermetallic compound layer is formed at an interface; the section of the welding strip is of a special-shaped structure, the width of a welding working face is larger than that of a non-welding working face, and the thickness of any position of the copper coating layer is not smaller than 8 micrometers. The production method comprises the steps of aluminum rod surface treatment, copper strip hot-pressing coating, multi-pass stretching and intermediate annealing, special-shaped rolling, diffusion annealing for interface layer thickness control, working face roughening and tin plating. Interface diffusion is inhibited through rare earth elements, the thickness of an intermetallic compound layer is accurately controlled, and high conductivity, excellent welding reliability and long-term heat-resistant cycle performance of the welding strip are guaranteed while remarkable light weight is achieved.

Particular embodiments may provide an anode material, comprising a compound of formula Li2—X—Y, wherein: X and Y are each independently a metal atom or a metalloid atom; the anode material has a discharge potential of less than about 0.4 V vs. Li / Li+; and the molar ratio of Li:X:Y is 2:1:1.

The invention discloses a laser powder feeding additive manufacturing device and method for an Nb-Si intermetallic compound composite material, and relates to the technical field of high-temperature structural material additive manufacturing. The method solves the problems that according to an existing method for preparing the Nb-Si intermetallic compound composite material through the laser directional energy deposition technology, due to the fact that the local temperature gradient is huge and thermal stress is too high, a formed part is prone to cracking, deformation and composition segregation, and a complete and compact component cannot be obtained. In an inert gas protection environment, dynamic preheating and post-heating heat preservation are carried out on the front area and the rear area of a laser molten pool through combination of overall preheating of a substrate and a local auxiliary heating device synchronously moving with a laser deposition head, and the temperature gradient of a deposition area is strictly controlled to be below a safety threshold value through infrared temperature measurement closed-loop control; and finally, stress release is completed through programmed slow cooling. The method is used for crack-free and high-quality near-net forming manufacturing of Nb-Si-based intermetallic compound composite material components for high-temperature structures in the aerospace field.

The semiconductor package structure provided by the present disclosure forms a metal layer on both end surfaces of a metal sheet (e.g., a copper foil) serving as a carrier by electroplating, and the metal layer reacts with the metal sheet to form an intermetallic compound (IMC) in a heating and pressing process. Since the melting point of the intermetallic compound (e.g., CuGa2) is higher than that of the metal layer (e.g., Ga) and is in a solid state, the whole forms a thermal interface material (TIM) that bonds a chip and a heat dissipation structure. The use of the metal sheet as the carrier can also meet the requirement that the height of the TIM exceeds 100 um. Compared with a conventional polymer material TIM, the thermal conductivity coefficient can be increased by more than 300%, and the heat dissipation performance of the chip is greatly improved.

The invention discloses a high-strength micro-nano hierarchical pore single-phase beta-NiAl (Cr) intermetallic compound. A preparation method comprises the following steps: 1, pressing beta-NiAl (Cr) alloy powder, sintering in vacuum, and cutting to obtain slices; 2, cleaning and purifying treatment; 3, carrying out electrochemical treatment by taking the treated thin sheet as a working electrode, and cleaning and drying; 4, vacuum heat treatment; 5, cleaning and drying; the intermetallic compound has a micro-nano two-stage pore structure with a first-stage pore size of 10 [mu] m-25 [mu] m and a second-stage pore size of 10 nm-100 nm. The high-strength and high-toughness porous single-phase beta-NiAl (Cr) intermetallic compound is prepared through a powder metallurgy method, micron pores are formed, Al is selectively dissolved through electrochemical treatment, nano pores are formed, the high-strength micro-nano hierarchical pore single-phase beta-NiAl (Cr) intermetallic compound is obtained, and the high-strength micro-nano hierarchical pore single-phase beta-NiAl (Cr) intermetallic compound is suitable for the fields of filtration, separation, ion exchange, hydrogen evolution electrodes, catalyst carriers and the like.

The present application relates to the field of electromagnetic pulse welding, and provides a kind of electromagnetic pulse welding spot intermetallic compound dynamic growth simulation method, comprising: pre-storing the distribution characteristics of each intermetallic compound in the welding spot at the time of welding;Obtain the action trajectory of the welding spot in the monitoring area and action trajectory;According to the multi-dimensional distribution characteristics of the welding spot in the monitoring area when the welding spot is generated, and compare it with the pre-stored welding spot distribution characteristics of the corresponding intermetallic compound;Dynamic update the distribution characteristics of each intermetallic compound in the welding spot at the time of welding;When the welding spot distribution characteristics change less than the set value within the set time period, the welding spot distribution characteristics at this time are taken as the final form of the welding spot growth, and the time period is divided into multiple sub-periods, and the welding spot distribution characteristics and time domain characteristics of each sub-period are obtained respectively;Couple the welding spot distribution characteristics of each sub-period with the corresponding time domain characteristics, and simulate the dynamic growth process of intermetallic compound.

A method for manufacturing an aluminum-scandium alloy sputtering target, wherein Sc x Al 1-x A method comprising the steps of atomizing to form a powder, where x is in the range of 0.05 to 0.5, and solidifying the powder to form a target having a microstructure characterized by an average particle size of up to 50 microns. An aluminum-scandium alloy sputtering target comprising one or more Al-Sc intermetallic phases comprising Al-Sc intermetallic particles, wherein the average Al-Sc intermetallic particle size is up to 50 microns.

The utility model relates to a kind of heat transfer copper pipes, comprising: heat conduction copper pipe, heat conduction copper pipe is provided with guide copper block, guide copper block is used to guide medium, heat conduction copper pipe is fixedly connected with the interface seat, the interface seat is along heat conduction copper pipe length direction setting, interface seat is slidably connected with heat conduction block, heat conduction block is provided with fixing piece, the fixing piece one end penetrates heat conduction copper pipe and is connected with heat conduction block, fixing piece can fix heat conduction block and guide copper block on heat conduction copper pipe, whole system is directly conducted through intermetallic, expands heat dissipation area and optimizes fluid path Three mechanical synergies, while maintaining maintainability, improve overall heat exchange efficiency.

The invention discloses a preparation method of an additive manufacturing chemical complex intermetallic compound, which is characterized by comprising the following preparation steps: 1) obtaining pre-alloyed powder in a gas atomization mode; 2) performing additive manufacturing on the pre-alloyed powder by a laser powder bed melting process to obtain the chemical complex intermetallic compound, the pre-alloyed powder comprises the following components in percentage by atom: 32-42 atomic percent of Ni; co: 33 to 43 at%; al: 10 to 15 at%; ti: 2 to 6 at%; 2 to 6 atom% of Ta; nb: 2 to 6 at%; b: 0.1 to 1 atom%; the remainder comprises unavoidable impurities. The invention also discloses an additive manufacturing chemical complex intermetallic compound prepared according to the method.

The application provides a multi-component platinum-bismuth-based intermetallic ordered nanosheet and a preparation method and application thereof, and relates to the technical field of multi-metal alloy catalysts.The multi-component platinum-bismuth-based intermetallic ordered nanosheet provided by the application comprises platinum elements, bismuth elements and auxiliary metal elements, the auxiliary elements comprise 1-4 kinds of iridium elements, ruthenium elements, osmium elements, rhodium elements, tin elements and lead elements, and the multi-component platinum-bismuth-based intermetallic ordered nanosheet has an intermetallic ordered structure and a two-dimensional nanosheet morphology.The multi-component platinum-bismuth-based intermetallic ordered nanosheet provided by the application is structurally stable, is applied to a fuel cell as a catalyst, and has excellent electrocatalytic performance, including formic acid oxidation electrocatalytic performance and alcohol oxidation electrocatalytic performance.The application provides a preparation method of the multi-component platinum-bismuth-based intermetallic ordered nanosheet, the preparation conditions are mild and simple to operate, and problems such as catalyst agglomeration caused by high-temperature calcination to transform an ordered phase are effectively avoided.

The invention discloses a sub-5 nano metal gap array and a preparation method thereof. The base body comprises a substrate layer and a metal nanostructure array which is arranged on the substrate layer periodically, and each metal nanostructure is composed of a first metal layer; the side wall of the metal nano structure is coated with a second metal layer, a lateral nano gap is formed between the second metal layer and the first metal layer, and the width of the lateral nano gap is sub-5nm.

The application discloses a spray forming wear-resistant and corrosion-resistant double-strengthening-phase precipitation hardening high-speed steel, which comprises the following components in percentage by mass: C: 0.2%-2.6%; Si: 0%-0.4%; Cr: 5.0%-15.0%; Co: 10.0%-30.0%; Ni: 0%-2.0%; (1.39Co+1.4Ni): 15.0% or more; V: 0%-8.0%; W: 0%-5.0%; Mo: 8%-20.0%; (Mo+W / 2): 10.0%-22.0%; and the balance of iron and impurities, wherein the steel is a double-strengthening-phase precipitation hardening high-speed steel, the strengthening phase comprises intermetallic compound (IMC) mu phase, MC carbide and (Cr, Fe) C type carbide, the mu phase is (Fe, Co) 7 (Mo+W / 2) 6 type, and the type of the MC carbide is V(C, N) type. The mu phase and the carbide of the prepared precipitation hardening high-speed steel are small in size and uniform in distribution, and the prepared precipitation hardening high-speed steel has excellent comprehensive performance, especially outstanding wear resistance and corrosion resistance, and can meet the requirements of different working conditions. The spray forming process is adopted in the application, and the spray forming process has the advantages of low cost and fast process compared with the powder metallurgy process.

The invention provides a surface anti-corrosion method for a molybdenum base material workpiece of high-temperature liquid metal. The surface anti-corrosion method comprises the following steps that the surface of a molybdenum base material sample is polished till the surface roughness of the molybdenum base material sample is Ralt; 0.1 [mu] m; the method comprises the following steps: placing a molybdenum base material sample and a GaInSn alloy in a reaction crucible, so that the molybdenum base material sample is completely infiltrated in the GaInSn alloy; putting a reaction crucible filled with the molybdenum base material sample and the GaInSn alloy into a reaction furnace, and introducing inert gas into the reaction furnace; after the temperature in the reaction furnace is increased to 965-980 K, reaction is conducted for 12-36 h, then the temperature in the reaction furnace is reduced to the room temperature, and an anti-corrosion protection layer can be obtained on the surface of the molybdenum base material sample; and the anti-corrosion protection layer comprises a continuous GaMo3 protection layer with the thickness of 37-47 [mu] m. According to the method, a layer of compact and continuous GaMo3 intermetallic compound protection film is generated on the surface of the molybdenum base material by triggering the controllable reaction of the molybdenum base material and the GaInSn-state metal in situ, so that the corrosion problem of the molybdenum base material in the high-temperature GaInSn liquid metal is fundamentally solved, and long-term stable protection is realized.

The invention discloses a gold-copper intermetallic compound superlattice array and a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing gold nanoparticles; then adding a toluene solution of oleylamine into the gold nanoparticles, mixing and oscillating, taking an upper layer oleylamine phase, and standing; dissolving copper acetylacetonate in an oleylamine solution, and adding the upper oleylamine phase for reaction to obtain gold-copper nanoparticles; and adding oleic acid into the gold-copper nanoparticles for modification to form superlattices, dropwise adding the superlattices into a diethylene glycol solution, and naturally evaporating to obtain the gold-copper intermetallic compound superlattice array. A gold-copper intermetallic compound is synthesized by adopting a high-temperature hydrothermal method, an atomic-scale long-range ordered structure is synthesized, functional molecules such as oleylamine and oleic acid are modified, a long-range ordered periodic structure is spontaneously arranged under non-covalent interaction, an electron energy band structure, carrier transport efficiency and light absorption characteristics can be regulated and controlled, and the photoelectric conversion efficiency is improved. The method has wide application potential in multiple fields.

The application belongs to the field of intermetallic compounds and provides a L12 type Co-Ni-Al-Ti intermetallic compound and a preparation method thereof.The chemical composition of the intermetallic compound is as follows: Ni: 30%-40%, Al: 8%-14%, Cr: 0-8%, Ti: 5%-10%, Ta: 0-5%, Nb: 0-5%, Co: 18%-57%, and the matrix of the intermetallic compound is L12 phase.The L12 type Co-Ni-Al-Ti intermetallic compound and the preparation method thereof have the following advantages: the intermetallic compound is a Co-rich chemical complex intermetallic compound, is significantly better than a traditional binary Co3Ti intermetallic compound, has very excellent strength (yield strength reaches 0.89 Gpa, and tensile strength reaches 1.5 Gpa) and plasticity (reaches 30%), and because the melting point of pure Co is 50-150 DEG C higher than that of pure Ni, the melting point of the intermetallic compound is higher than the dissolution temperature (about 1100 DEG C) of a traditional nickel-based high-temperature alloy gamma' phase, and the intermetallic compound can be applied at a higher temperature.

The application belongs to the technical field of intermetallic compound functional thin films, and provides a high-temperature-resistant and oxidation-resistant Au-Hf intermetallic compound thin film and a preparation process thereof; the thin film is a vertical nanocomposite structure with a full film thickness, and the core comprises Au3Hf nanocolumns with a composition gradient in the radial direction, a ceramic matrix phase with a gradient distribution along the film thickness, and a 1-2 nm thick composition gradient interface bonding transition layer between the two; the application is aimed at the specific failure mechanism of Au3Hf high-temperature phase decomposition and element interdiffusion, and through two-dimensional gradient collaborative design, long-term structure and performance stability under 500 DEG C air atmosphere are realized, and the thin film also has the in-situ oxidation-resistant self-sealing function of nanoscale microcracks; the process is fully compatible with industrial magnetron sputtering equipment, and can be widely applied in the fields of high-temperature plasma devices and heat-assisted magnetic recording.