318 results about "Aluminium matrix" patented technology

The invention discloses a gradually-changed Si-Al alloy coating diamond / aluminum-based composite material and a preparation method and application thereof, and the gradually-changed Si-Al alloy coating diamond / aluminum-based composite material is composed of an aluminum matrix and modified diamond evenly dispersed in the aluminum matrix. The modified diamond comprises diamond particles and a gradually-changed Si-Al alloy coating wrapping the surfaces of the diamond particles, in the gradually-changed Si-Al alloy coating, the mass fraction of Si is linearly decreased from 100% to 0% from inside to outside, and the mass fraction of Al is linearly increased from 0% to 100% from 0%. According to the method, the Si-Al alloy coating with gradually-changed and controllable components is constructed on the surface of the diamond, so that a SiC transition layer with strong binding force can be formed with the diamond, the gradient gradient coating is formed from inside to outside, internal stress can be released, good metallurgical bonding with an aluminum matrix can be achieved, formation of an Al4C3 phase is inhibited, and therefore the performance of the composite material is remarkably improved.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention belongs to the technical field of aluminum alloy heat treatment, and particularly relates to a high-strength Al-Mg alloy and a preparation method thereof. According to the Al-Mg alloy, nucleation particles are provided for an AlMn second phase in an aluminum matrix through Mn and Zn alloying, and the activation energy of the AlMn second phase is reduced. According to the preparation method, the prepared alloy is mainly subjected to multi-stage homogenization treatment, and in multi-stage homogenization, the low temperature is used for second-phase pre-nucleation, the middle temperature is used for second-phase nucleation and precipitation, and the high temperature is used for coarse crystal phase redissolution. The alloy ingot is subjected to multi-stage homogenization heat treatment by adopting the method, the second phase precipitation number density of the alloy ingot can be remarkably improved, and the distribution uniformity of the alloy ingot can be improved, so that the strength of the alloy is improved, a large number of subcrystal structures are reserved in the alloy in the subsequent hot working process, and recrystallization and abnormal growth are effectively inhibited; and an optimal deformation structure is provided for obtaining a high-performance aluminum alloy product.

The invention provides a preparation method and application of a foamy copper reinforced aluminum-based composite material, and belongs to the technical field of aluminum-based composite material preparation. According to the foamy copper reinforced aluminum-based composite material, a variable-frequency and variable-power ultrasonic vibration assisted centrifugal casting technology is adopted, strong centrifugal force and the ultrasonic cavitation effect are utilized, so that the biological flowability of aluminum water is improved, the wettability between aluminum and copper is improved, and in combination with the effects of an auxiliary agent and Zn-Al or Sn-Al intermediate alloy, the foamy copper reinforced aluminum-based composite material is obtained. The problem that the binding force of foamy copper and an aluminum matrix is poor is solved, the adopted ultrasonic power is low (smaller than or equal to 1000 W), the preparation technology is simple, the obtained foamy copper reinforced aluminum matrix composite is free of obvious cracks and holes and high in density and thermal diffusion coefficient, and a light intelligent thermal management material can be provided for the field of electronic equipment.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The invention discloses a long-life aluminum profile for a mold and a preparation process thereof, and relates to the technical field of aluminum alloys, a zirconium film is loaded on the surface of the aluminum profile, the zirconium film generates an oxide layer on the surface of an aluminum substrate through hydrolysis reaction, micropores in the surface of the aluminum substrate are filled, and the corrosion resistance of the aluminum profile is enhanced. However, the corrosion resistance of a single zirconium film is insufficient, and the corrosion resistance of the aluminum profile is further enhanced by coating the surface of the aluminum profile with the zirconium film with the anti-corrosion liquid. 3-epoxypropoxy propyl triethoxy silane is added into the zirconium conversion liquid, so that the surface of a zirconium film is provided with epoxy groups, the epoxy groups on the surface of the zirconium film and amino groups in the corrosion-resistant chitosan microcapsules form hydrogen bonds and coordinate bonds, the bonding strength of a corrosion-resistant coating is improved, and therefore the corrosion resistance of the aluminum profile for the mold is improved.

The invention provides a welding method of an aluminum-based composite material and an aluminum-based composite material joint, and relates to the technical field of welding, the welding method comprises the following steps: plating a metal layer on a to-be-welded surface of the aluminum-based composite material to obtain a to-be-welded part; wherein the aluminum-based composite material comprises an aluminum matrix and a ceramic reinforced phase, the metal layer is used for forming an eutectic phase with the aluminum matrix, and the melting point of the eutectic phase is 440 DEG C or below; the two to-be-welded parts are assembled, so that the metal layers of the two to-be-welded parts are attached, and an assembly part is obtained; under the vacuum condition, preset pressure is applied to the assembly part, the assembly part is heated to the welding temperature under the action of pulse current, heat preservation is conducted for preset time, the assembly part is cooled to the room temperature, and the aluminum-based composite material connector is obtained; wherein the direction of the pulse current is perpendicular to the to-be-welded surface of the aluminum-based composite material. By adopting the method disclosed by the invention, the aluminum-based composite material joint with relatively high strength and relatively low deformation rate can be obtained.

The utility model discloses a connecting structure of an aluminum-based bus duct with copper-clad end parts, and relates to the technical field of busbars. The copper-aluminum eutectic conducting bar comprises a copper-aluminum eutectic conducting bar body, the copper-aluminum eutectic conducting bar body comprises an aluminum alloy base body layer A, the end portions of the upper side face and the lower side face of the aluminum alloy base body layer A are covered with copper connecting layers A, and the copper-aluminum eutectic layer A is arranged between the aluminum alloy base body layer A and the copper connecting layers A. The copper-aluminum eutectic conducting bar further comprises a connector which comprises a plurality of copper-aluminum eutectic connecting pieces. The copper-aluminum eutectic conducting bar is clamped by the connector and tightly abuts against the copper-aluminum eutectic connecting piece. The beneficial effects of the utility model lie in that the utility model combines the advantages of low density and low cost of aluminum and the characteristics of high conductivity and corrosion resistance of copper, and only the end part of the aluminum substrate is coated with copper, so that the overall cost is reduced, the excellent performance of key parts is ensured, the perfect balance between the performance and the cost is realized, and the copper-aluminum eutectic technology is adopted. The problems that interface bonding is not firm, resistance is large, and corrosion is prone to occurring when aluminum and copper are directly connected are effectively solved.

The invention discloses a dispersion distribution method for a micro-nano multi-scale mixed SiC particle reinforced phase in an aluminum-based composite material and the composite material, and relates to the technical field of metal-based composite material preparation. The method comprises the following steps: firstly, carrying out ultrasonic cleaning, ultrasonication and two-stage high-temperature oxidation treatment on SiC particles, and generating an oxidation film on the surfaces of the particles; ball-milling and mixing the treated micron and nano SiC particles and micron pure magnesium particles according to a specific proportion, and pressing into a precast block; then preparing an aluminum alloy melt, cooling to a solid-liquid two-phase region, carrying out semi-solid stirring, and adding the preheated precast block; and finally, raising the temperature to be above a liquidus, rewarming, stirring and molding by casting. Through the synergistic effect of ultrasonic physical dispersion, high-temperature oxidation surface modification and magnesium-induced semi-solid stirring, the problems that micro-nano particles are prone to agglomeration, wettability is poor and interface reaction is difficult to control are effectively solved, multi-scale uniform dispersion distribution of a reinforced phase in an aluminum matrix is achieved, and the comprehensive performance of the composite material is remarkably improved.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength decorative aluminum product metal material and a preparation method thereof. The preparation method of the high-strength decorative aluminum product metal material comprises the following steps: (1) adding carbon nano onions, sulfuric acid and oxalic acid into water to prepare a mixed acid solution, immersing an aluminum matrix into the mixed acid solution for anodic oxidation, and then cleaning and drying to prepare a pretreated aluminum matrix; and (2) polyformaldehyde fibers are added into the dispersion liquid, a heating reaction is conducted, a mixed solution is obtained, the surface of a pretreated aluminum matrix is coated with the mixed solution, then heat treatment is conducted, after aging is conducted at the room temperature, cleaning and drying are conducted, and the high-strength decorative aluminum product metal material is obtained. The preparation process is simple, the product performance is stable, and the product has the properties of high strength, high hardness, wear resistance, super-hydrophobicity, self-cleaning and the like.

The invention discloses a graphene-aluminum composite material and a preparation method thereof, and belongs to the technical field of metal-based composite material preparation. The raw materials comprise modified aluminum particles and a graphene dispersing agent; the production process comprises the steps of aluminum particle interface modification treatment, graphene dispersing agent preparation, modified aluminum particle wrapping with graphene, heating pressing and heating extrusion forming. A nanometer interface modification layer is constructed on the surfaces of aluminum particles through a modifier to improve wettability and inhibit generation of Al4C3, a specially-made pressing device improves the compactness of a green body, inert gas protection is matched for extrusion, the performance of the composite material is optimized, and the problems that graphene and an aluminum matrix are poor in interface compatibility, prone to agglomeration, prone to generating brittleness at high temperature and the like are solved; the graphene is uniformly dispersed, and the composite material has excellent mechanical properties and high conductivity and is suitable for industrial mass production.

The invention discloses a graphene reinforced Al-Cu composite material and a preparation method and application thereof, and belongs to the technical field of metal matrix composite materials and preparation thereof. The problems that in an existing graphene reinforced aluminum matrix composite, graphene is poor in dispersity in an aluminum matrix, and harmful interface reaction is serious at the high temperature are solved. According to the preparation method, the surface of aluminum powder is plated with nano-copper particles through chemical plating, the potential of the aluminum powder in a water medium is regulated and controlled through a copper plating layer on the surface, the surface of the aluminum powder is provided with positive charges, graphene can be evenly dispersed in a matrix through electrostatic self-assembly, and meanwhile the surface copper plating layer is used for inhibiting interface reaction and hindering generation of a brittle phase. In addition, by adding the metal copper, the solid solution and second phase strengthening effects can be achieved, and the mechanical property of the composite material is further improved.

The invention discloses a high-strength and high-plasticity low-melting-point aluminum alloy brazing material and a preparation method and application thereof, and relates to the technical field of solder manufacturing. The low-melting-point aluminum alloy welding flux is prepared from the following components in percentage by weight: 10 to 14 percent of Si, 4 to 20 percent of Cu, 0.04 to 0.25 percent of Eu, 0.78 to 0.82 percent of Fe, 0.13 to 0.17 percent of Mn, 0.08 to 0.12 percent of Mg, 0.18 to 0.22 percent of Zn and the balance of aluminum and inevitable impurities. The Al-Si-Cu ternary alloy is constructed to form a low-melting-point eutectic phase, the melting point of the material is effectively reduced, meanwhile, Eu atoms are doped, the aluminum matrix is subjected to the pressure stress effect, the interplanar spacing is reduced, the grain size of the matrix aluminum phase is reduced, the elemental Si phase is refined, the eutectic Al-Si phase content is increased, and precipitation of the brittle Al2Cu phase is restrained; therefore, the aluminum alloy solder has high tensile strength and elongation after fracture under the condition that the melting point is low.

The invention provides TiB2 reinforced aluminum-based composite powder, a preparation method and application of the TiB2 reinforced aluminum-based composite powder and a TiB2 reinforced aluminum-based composite material. The preparation method of the TiB2 reinforced aluminum-based composite powder comprises the following steps: preparing 7xxx series aluminum alloy into a rod-shaped electrode; an electrode induction melting gas atomization method is adopted, a rod-shaped electrode is atomized into an aluminum matrix liquid flow, meanwhile, TiB2 powder is added, so that the 7xxx series aluminum alloy and the TiB2 powder are subjected to co-deposition, and TiB2 reinforced aluminum matrix composite powder is obtained; the total weight of the TiB2 reinforced aluminum-based composite powder is 100%, and the total feeding amount of the TiB2 powder is 8%-10%; and the particle size of the TiB2 powder is nanoscale. On the basis of a crucible-free electrode induction melting gas atomization (EIGA) mode, gas atomization co-deposition of nanoscale TiB2 particles and aluminum alloy molten drops is achieved at a powder manufacturing source, and the purposes that a reinforced phase is evenly dispersed and the material is high in cleanliness are achieved.

The invention discloses a preparation method of a graphene reinforced 2024Al composite material (Gr / 2024Al) with a three-dimensional network structure, and relates to a preparation method of a metal composite material. The invention aims to solve the following problems: 1, the structural integrity of graphene treated by a ball milling method is seriously damaged to cause poor interface reaction; and 2, the graphene subjected to ball milling treatment is high in energy, so that solute atoms are not uniformly dispersed, and negative effects are generated on the subsequent aging behavior and the mechanical property of the material. The preparation method disclosed by the invention comprises the following steps: 1, preparing GO-2024Al composite powder by an electrostatic self-assembly method; secondly, a Gr / 2024Al composite material is prepared through a hot pressing sintering method; and thirdly, the Gr / 2024Al composite material is subjected to solid solution aging heat treatment, and the mechanical property of the Gr / 2024Al composite material is further improved. The graphene reinforced 2024Al composite material with the three-dimensional network structure has the following characteristics that 1, the graphene structure is complete, and the graphene is uniformly dispersed in an aluminum matrix; 2, the graphene / aluminum matrix interface is combined cleanly and tightly; and 3, the mechanical property of the composite material is high.

The invention discloses a graphene / aluminum alloy composite material with high conductivity and a preparation method thereof, and belongs to the technical field of metal-based composite materials. And the electric conductivity is not lower than 70% IACS. The preparation method comprises the following steps: carrying out surface copper plating pretreatment on aluminum alloy powder; performing ultrasonic dispersion on graphene by using a polyvinyl alcohol solution to obtain a stable dispersion liquid; mixing, stirring, drying and filtering the copper-plated powder and the graphene dispersion liquid to obtain graphene-coated composite powder; and finally, carrying out rapid densification sintering by adopting a spark plasma sintering technology. The core innovation point of the preparation method is that the problem of dispersion and interface combination of graphene in an aluminum matrix is solved synergistically through combination of a copper plating transition layer and PVA auxiliary dispersion-adsorption coating, then interface reaction is avoided through SPS rapid sintering, finally, the composite material with excellent conductivity is obtained, and the technical index reaches the domestic leading level.

The invention provides an aluminum-based bionic composite material with a titanium alloy as a skeleton reinforcement phase and a preparation method of the aluminum-based bionic composite material, and belongs to the field of metal-based composite materials. The aluminum-based bionic composite material with the titanium alloy as the framework reinforcement phase comprises an aluminum matrix and the titanium alloy framework reinforcement phase. The titanium alloy skeleton reinforced phase is of a porous structure with the characteristics of a bionic tooth enamel columnar microstructure, and the porous structure is cylindrical through holes which are densely distributed; the aluminum matrix is filled in the cylindrical through hole; the volume percent of the titanium alloy framework reinforcement phase in the aluminum-based bionic composite material with the titanium alloy as the framework reinforcement phase is 30-80%. The tensile strength of the aluminum-based bionic composite material can reach 811 MPa, the percentage elongation after fracture can reach 10.3%, the bending strength can reach 1491 MPa, the fracture toughness can reach 47 MPa.m < 1 / 2 >, and the aluminum-based bionic composite material shows an excellent toughness synergistic effect.

The invention relates to a preparation method of a porous aluminum-based composite material capable of reducing damage of hollow glass microspheres, belongs to the technical field of aluminum-based composite materials, and solves the problems in the prior art that the hollow glass microspheres are easy to be unevenly distributed in an aluminum matrix and are easy to soften and crack. The invention discloses a preparation method of a porous aluminum-based composite material capable of reducing damage of hollow glass microspheres. The preparation method comprises the following steps: step S1, preparing a composite preform; step S2, vacuum air pressure infiltration: carrying out vacuum air pressure infiltration on the foam metal-hollow glass microsphere composite preform; and S3, obtaining a finished product. The preparation method of the porous aluminum-based composite material capable of reducing damage of the hollow glass microspheres is simple in process, easy to operate and high in safety, and the hollow glass microspheres in the obtained porous aluminum-based composite material are high in integrity and uniform in distribution.

The invention provides an MAX phase / alumina layered composite ceramic and an in-situ synthesis preparation method thereof, and the method comprises the following steps: respectively preparing an alumina matrix layer and an MAX phase interface layer through a tape casting method, then alternately laminating the alumina matrix layer and the MAX phase interface layer, and finally carrying out hot pressed sintering to obtain a layered composite ceramic product. According to the invention, the layered composite ceramic which takes aluminum oxide as a matrix and MAX-phase ceramic as an interlayer is prepared through an in-situ synthesis technology, so that the effects of great toughening, strength increase without reduction and high damage tolerance are realized, and the fracture mode is converted from brittle fracture of aluminum oxide ceramic to safe stepped fracture. The strength and toughness of the aluminum oxide ceramic are successfully balanced and synergistically improved, and the industrial problem that strength and toughness cannot be both considered in a traditional aluminum oxide ceramic toughening technology is solved.

The invention discloses a preparation method of a corrosion-resistant composite cable conductor, and relates to the technical field of alloy cables, and the preparation method comprises the following steps: carrying out smelting, refining, casting, annealing, extrusion and aging treatment on a high-purity aluminum matrix and an intermediate alloy containing a conductivity improving element to obtain an aluminum alloy conductor mixture; the preparation method comprises the following steps: burdening and mixing reinforced fibers, a polymer matrix, an interface reinforcing agent and a nano filler to prepare a creep-resistant reinforced mixture; the aluminum alloy conductor mixture and the creep-resistant reinforced mixture are subjected to a co-extrusion process to prepare the composite cable; a polymer matrix, an interface reinforcing agent, a functional filler and a plasticizer are blended and mixed, and a corrosion-resistant protective layer is prepared outside the composite cable through surface activation and secondary extrusion processes. Through the composite structure of the creep-resistant reinforcing layer and the aluminum alloy conductor, the creep-resistant capability of the cable is remarkably improved; and the corrosion-resistant protection layer is tightly combined with the composite cable, so that the cable is suitable for a humid or salt-fog environment.

The invention relates to the field of porous metal materials, in particular to a polymer-based porous metal composite material and a preparation method thereof.The polymer-based porous metal composite material is composed of, by mass, 50-55 parts of a porous aluminum matrix, 20-25 parts of modified epoxy resin, 15-20 parts of modified carbon fibers, 4-6 parts of hollow glass microspheres and 6-8 parts of polyether-ether-ketone. According to the invention, through collaborative design of a special group grafting modified resin system and a multi-stage structure, and in combination with a chemical-physical double-effect interface strengthening process and stepped precise curing control, the problem of collaboration of light weight and high strength in a light-weight composite material is solved. Compared with the prior art, on the premise of keeping ultra-low density, remarkable improvement of heat resistance, interface reliability and multifunctionality is achieved, and the ultra-low density composite material perfectly adapts to the field of high-end equipment such as light-weight battery boxes of new energy automobiles and aerospace high-temperature-resistant components and has wide industrialization prospects.

The application relates to the technical field of power connection device manufacturing, in particular to a manufacturing method of a track socket busbar, a composite busbar and a track socket, and aims to solve the problems that although a traditional silver plating process can delay copper-based oxidation, the silver layer is easy to wear and the cost is high, and although a micro-arc oxidation layer of an aluminum-based busbar has insulation, a porous structure is easy to absorb moisture, leading to a decrease in corrosion resistance. The application forms a silver-nickel alloy layer with metallurgical bonding through laser surface alloying, generates an in-situ ceramic insulation layer through micro-arc oxidation, and realizes stable compounding of copper-aluminum substrates by using a mechanical occlusion structure, so that the advantages of synchronously improving the electric conductivity and the corrosion resistance and solving the interface delamination problem are achieved.

This invention belongs to the field of aluminum-ion battery technology, specifically relating to an aluminum-ion battery based on a biomimetic CNT / Al composite metal anode. It comprises a positive electrode, a non-aqueous aluminum salt-based ionic liquid electrolyte, a separator, and a biomimetic CNT / Al composite metal anode. The biomimetic CNT / Al composite metal anode consists of an aluminum substrate and a three-dimensional continuous electron permeation network formed within the aluminum substrate. The aluminum substrate is a micro / nano-scale aluminum sheet, and the three-dimensional continuous electron permeation network is formed by carboxylated multi-walled carbon nanotubes. The three-dimensional continuous electron permeation network extends to the surface of the biomimetic CNT / Al composite metal anode. Compared with existing technologies, this invention solves the problem that existing technologies cannot simultaneously address the issues of ion mass transfer kinetics and interfacial mechanical stability during long-term cycling. This solution achieves long-term stable cycling of the aluminum-ion battery under harsh conditions by constructing a CNT / Al anode with a carbon nanotube (CNT)-like neural network structure.

The invention provides a nanometer Al3Ti reinforced aluminum-based composite material and a preparation method thereof, and relates to the technical field of aluminum-based composites.The preparation method comprises the following steps that MAX-phase ceramic particles and aluminum raw material powder are mixed and then subjected to first ball milling treatment, and first mixed powder is obtained; wherein the MAX phase ceramic particles are micron-sized ceramic particles; the first mixed powder is heated, the MAX phase reacts with Al to form A13Ti, and second mixed powder is obtained; the second mixed powder is subjected to second ball milling treatment, and third mixed powder is obtained; wherein the average particle size of A13Ti in the third mixed powder is nanoscale; and the third mixed powder is subjected to aftertreatment, and the nanometer Al3Ti reinforced aluminum matrix composite is obtained. According to the method, a nanometer strengthening phase is introduced into an aluminum matrix in a rough-to-fine mode, and the problem that when nanometer raw material powder is directly added, nanometer particles are agglomerated, and consequently the strength and plasticity of the composite material are poor is solved.

The invention provides an aluminum alloy pretreatment method based on complex reaction, which comprises the following steps: S1, polishing an LDH (Layered Double Hydroxides) growth surface by using abrasive paper, and cleaning and drying; s2, preparing a complexing agent solution, wherein a complexing agent is selected from at least one of tannic acid, gallic acid and protocatechuic acid; s3, the aluminum alloy sample treated in the step S1 is put into the complexing agent solution in the step S2, and constant potential is applied to the aluminum alloy; s4, preparing a mixed solution of Zn (NO3) 2.6 H2O and NH4NO3, and adding an ammonia water solution to adjust the pH value to 6-6.5; s5, immersing the aluminum alloy treated in the step S3 into the mixed solution in the step S4, and putting the aluminum alloy into a constant-temperature water bath kettle to generate a Zn-Al-LDH film; and S6, after the hydrothermal reaction is finished, cooling to room temperature, and washing and drying the obtained reaction product. The surface of the aluminum alloy is pretreated through the complexing agent, the potential between an intermetallic compound and an aluminum matrix can be effectively balanced, the micro-couple effect is fundamentally inhibited, and ideal conditions are created for uniform, compact and defect-free growth of LDH.

The utility model discloses a fastening structure of copper clad aluminum material in the technical field of fastener, including bolt and setting first conical washer, conical pipe, second conical washer and nut on bolt in assembly direction in proper order, the head of bolt and first conical washer are located one end of copper clad aluminum material, second conical washer and nut are located the other end of copper clad aluminum material, and conical pipe is located inside copper clad aluminum material. This fastening structure adopts the symmetrical structure of "bolt + conical washer + conical pipe + conical washer + nut", and through conical pipe and upper and lower conical washer constitutes clearance compensation unit, when aluminum matrix produces plastic deformation because of high temperature, conical pipe fills the clearance through axial slight expansion, and lower conical washer taper surface self -locking effect locks residual pre -tightening force simultaneously, forms the closed -loop control of deformation -compensation -locking, realizes stress self -adaptive adjustment through the geometric adaptation of rigid taper surface, and it has good application prospect in the fastening of copper clad aluminum material.

This invention belongs to the field of aluminum alloy grain refiners, specifically relating to an aluminum-based multi-component boride grain refiner resistant to Si poisoning and its preparation method. The grain refiner is produced by combining an aluminum matrix with hexagonal plate-like (Ti) compounds uniformly distributed within the aluminum matrix. 0.33 Nb 0.33 V 0.33 The method comprises the following steps: (1) Weighing raw materials: Weigh industrial pure aluminum, aluminum-boron master alloy, titanium, niobium, vanadium, and boron in proportion; (2) Smelting: Place industrial pure aluminum, aluminum-boron master alloy, titanium, niobium, vanadium, and boron in a water-cooled copper crucible of a vacuum arc furnace and smelt to obtain a grain refiner. The grain refiner prepared by this invention can achieve a good grain refinement effect, is inexpensive and has high preparation efficiency, and the raw materials for the grain refiner are easy to obtain.

The invention discloses a high-adhesiveness film sintered aluminum flat wire and a preparation process thereof, a first coating contains plastic metal filler, a second coating contains high-modulus fibers, the high-modulus fibers in the second layer and the plastic metal filler in the first layer form a mechanical interlocking structure, and the metal filler and an aluminum matrix form physical metallurgical bonding. The fiber network in the second layer rapidly disperses local concentrated stress to a larger area by means of the high elastic modulus of the fiber network, and when the stress peak value which is not completely eliminated is transmitted to the first layer, the plastic metal filler can generate irreversible plastic deformation; the bonding strength between the thin film layers and between the thin film layers and the aluminum matrix is enhanced through a mechanical interlocking structure and physical metallurgical bonding, mechanical energy is converted into deformation work consumption, stress is prevented from being accumulated at an interface, and therefore the anti-fatigue and anti-impact performance of the coating is remarkably improved.

The invention relates to a method for influence of dislocation dipole defects in an aluminum matrix on acoustic parameters, belongs to the technical field of discrete solution, and provides a novel molecular dynamics simulation method for researching ultrasonic sound velocity, sound attenuation and acoustic nonlinear parameter change on the basis of two dislocation dipole structures. The method specifically comprises the following steps: controlling the type and the number of dislocation dipoles in an aluminum matrix, carrying out atomic scale acoustic simulation on dislocation dipole models of different types and numbers by adopting a phase inversion technology, extracting sound velocity by adopting a cross correlation method, extracting sound attenuation by adopting a Hilbert transformation method and extracting acoustic nonlinear parameters by adopting an FFT method aiming at four-phase signals; and precise extraction of acoustic parameters is realized. And determining the contribution of the dislocation defect to the acoustic parameters based on the relationship fitting of the three acoustic parameters and the dislocation defect, thereby realizing the prediction from the acoustic parameters to defect characteristics.

The invention belongs to the technical field of cladding tube surface treatment, and discloses a water boiling oxidation method of a nuclear-grade extrusion forming aluminum material, which comprises the following steps: preliminarily cleaning a fuel element, immersing the fuel element in nitric acid for immersion cleaning, regenerating a layer of uniform porous white oxidation preforming film, and removing nitric acid on the surface of the fuel element, so as to obtain the nuclear-grade extrusion forming aluminum material. The fuel element is immersed in nitric acid for immersion cleaning, yellow / gray stripes formed by residual substances on the surface of the fuel element after high-temperature nitric acid immersion cleaning are removed, nitric acid on the surface of the fuel element is removed, the surface of the fuel element is repeatedly wiped in the cold running water washing process, and impurities generated by reaction of the surface of the fuel element and aluminum are removed; the fuel element is immersed in deionized water with the water temperature exceeding 80 DEG C to be sealed and stored, a nanoscale oxidation film is prepared through the reaction of aluminum and water, and the fuel element is dried. According to the method, the bonding strength of impurities and an aluminum matrix in the nitric acid treatment process can be reduced, the impurities can be effectively removed, and large-area water marks on the surface of the aluminum material after automatic boiling oxidation are avoided.