164 results about "Aluminium matrix" patented technology

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 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 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 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 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 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 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 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.

This utility model discloses an aluminum substrate structure for a parallel grinding wheel, including an aluminum substrate, a grinding wheel, a limiting groove, a third connecting plate, an internal rotating component, a limiting component, a second connecting plate, and an internal rotating groove. The grinding wheel is fitted onto the aluminum substrate. The first connecting plate is disposed on one side of the aluminum substrate. A third connecting plate is disposed on the opposite side of the aluminum substrate away from the first connecting plate. The third connecting plate and the first connecting plate are located at the middle position of the aluminum substrate. The third connecting plate and the first connecting plate have a connecting slot. This utility model, by providing a replaceable internal rotating component within the aluminum substrate, and a limiting groove, a third connecting plate, and a limiting component for inserting and fixing the internal rotating component, allows the internal rotating component to engage with the limiting groove and be fixed within the aluminum substrate during use. The limiting component then allows for disassembly and fixation of the internal rotating component, facilitating future replacement of the internal rotating component.

This invention belongs to the field of aluminum alloy materials technology, and relates to a high-strength and ductile aluminum alloy and its preparation method. The alloy comprises, by mass fraction: 2-6% Mg, 0.4-0.9% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, with the balance being Al. By introducing Sn, a low-melting-point MgSiSn primary phase is formed in the as-cast stage, and transforms from a continuous network to a discontinuous granular structure during homogenization heat treatment, weakening the adverse effects of brittle intermetallic compounds at grain boundaries. Simultaneously, Sn dissolved in the aluminum matrix forms a nanoscale MgSiSn precipitate during homogenization, serving as a heterogeneous nucleation core for the Mn-containing second phase, lowering its nucleation energy barrier, and promoting high-density, fine, and uniform precipitation, thereby achieving a synergistic improvement in the alloy's strength and ductility.

The invention belongs to the technical field of spraying, and provides a cold spraying method of an agglomerated silicon carbide particle reinforced aluminum-based composite coating, which comprises the following steps: step 1, based on a pre-ceramic pyrolysis technology, obtaining agglomerated silicon carbide particles with the average size of 50 microns; 2, performing low-energy ball milling on the agglomerated silicon carbide particles and the aluminum powder by using a ball mill, so that the agglomerated silicon carbide particles and the aluminum powder are uniformly mixed to obtain mixed powder of silicon carbide and the aluminum powder; thirdly, the mixed powder obtained in the second step is sprayed to a base material in a cold spraying mode; according to the method, agglomerated silicon carbide particles are prepared through a pre-ceramic pyrolysis technology, the stability of ceramic particles in the cold spraying process is effectively improved, uniform distribution of the ceramic particles in an aluminum matrix is promoted, and through introduction of the agglomerated silicon carbide particles, the hardness and wear resistance of the composite coating are remarkably improved; meanwhile, due to the fact that the ceramic particles are evenly distributed in the aluminum matrix, stress concentration is reduced, and the overall mechanical property of the coating is improved.

This invention relates to the field of semiconductor device technology and discloses an aluminum-based copper-plated electrode for integrated circuits and its preparation method. The electrode includes an aluminum substrate. A first copper plating layer and a first aluminum plating layer are disposed on the surface of the aluminum substrate, forming a first composite coating layer. The first copper plating layer and the first aluminum plating layer are separated. A second copper plating layer and a second aluminum plating layer are disposed on the upper surface of the first copper plating layer and the first aluminum plating layer, forming a second composite coating layer. The first copper plating layer and the second copper plating layer correspond to each other, and the first aluminum plating layer and the second aluminum plating layer correspond to each other. This aluminum-based copper-plated electrode for integrated circuits and its preparation method, through the oblique corrugated structure design of the aluminum substrate surface and the design of the blocky composite coating layers arranged perpendicularly to each other of the same material, disperse and release the interlayer shear stress caused by the thermal expansion difference between aluminum and copper, thus solving the problem of coating delamination and peeling.

The present application relates to high-quality aluminum alloy plate processing technology field, disclose a kind of copper clad aluminum alloy annealing-free rolling method, comprising: removing composite blank surface dirt and oxide skin and completing straightening, send into cantilever rolling mill;Control 9 pass continuous cold rolling, so that single pass reduction rate is in the range of 8% to 15%, the rolling speed of the first 8 passes is gradually increased from 0.4m / s to 1.0m / s, and the single pass reduction rate is distributed in gradient decreasing;Finished pass rolling speed is stabilized at 1.2m / s, combined with preset pressure interval spraying emulsion, the present application offsets heterogeneous metal interface shear stress accumulation by discretization distribution total deformation, balances oil film thickness and exports interface heat using dynamic pressure lubrication mechanism generated by high-speed rolling, realizes copper layer and aluminum matrix synchronous plastic extension under the condition of no intermediate annealing, ensures finished product size precision and surface quality.

The present application relates to the technical field of metal pressure processing, and discloses an extrusion method for recycled aluminum alloy profiles for anodic oxidation and electrophoretic spraying, which comprises the following steps: adding strontium and boron into recycled aluminum melt, controlling the mass ratio with iron, forming an interface enrichment layer with shear sensitivity on the surface of the iron-containing impurity phase by using strontium; establishing an ingot axial temperature gradient, and controlling the average equivalent strain rate in the extrusion process to be maintained in the critical rheological interval, and physically activating the interface enrichment layer to produce shear thinning; and implementing online gradient freezing quenching after the profile leaves the die. Through the synergy of the critical strain rate and the interface modification, the present application builds an in-situ lubricating layer between the hard impurity phase and the aluminum matrix, eliminates the microscopic tearing caused by the rheological mismatch, and solves the color difference problem of the recycled aluminum surface treatment.

The application discloses a melt composite treatment method with the advantages of improving the mechanical properties and heat conduction performance of cast aluminum alloy, which comprises the following steps: carrying out boronization treatment on Al-Si series cast aluminum alloy melt to remove transition elements such as V, Ti and Cr, reduce the solid solubility of the above-mentioned elements in the aluminum matrix, reduce the degree of lattice distortion, and improve the heat conductivity of the alloy; further carrying out heat preservation and liquid transfer treatment on the melt to guarantee the removal effect of the above-mentioned elements; and adding Al-Sr-RE composite modifier with a specific content to modify the eutectic silicon in the alloy. Through the cooperation of the above-mentioned treatment methods, the obtained aluminum alloy has excellent mechanical properties and heat conduction performance, can greatly meet the performance requirements of the market and existing products, and has the significance of wide popularization and application.

The present patent of invention relates to aluminium-graphene nanocomposites with high electrical and thermal conductivity, and methods for obtaining same via microstructural control, and more specifically to the incorporation of multilayer graphene nanoplatelets (mGNP or few-layer graphene), comprising up to 10 layers, into pure commercial aluminium or aluminium alloys, using electric furnaces. The nanocomposites obtained comprise an aluminium matrix with dispersed graphene as the reinforcing phase, in proportions ranging from 0.1 wt% to 3 wt%. In order to obtain the nanocomposites, gravity casting techniques were employed in resistive and induction furnaces, with adaptations to prevent oxidation through the use of an inert gas atmosphere. The methodology employed enables a significant increase in electrical conductivity, ranging from 45% to 95% relative to the as-received commercial material, depending on the amount of graphene added. The thermal diffusivity of the nanocomposites also increased by 15% to 50%, with a possible maximum of around 0.5 wt% to 1 wt% of graphene. Similarly, the general physical properties exhibited marked improvements, although the rate of improvement decreased for nanocomposites containing more than 2 wt% of graphene.

The invention provides an aluminum-based composite material manufacturing device and method based on wire and powder composite laser additive materials. The device comprises a laser system, a powder laying system, a wire feeding system, a movement mechanism and a control system. The powder spreading system spreads reinforced powder layer by layer, the wire feeding system feeds aluminum matrix wires, and the movement mechanism synchronously drives the laser system and the wire feeding system to move. The control system regulates and controls the powder laying thickness according to the descending amount, and layer-by-layer independent control over the supply amount of the reinforcing material is achieved; controlling the laser system to fuse at the first power to form an initial deposition layer on the surface of the powder layer; re-melting at second power to realize metallurgical bonding with the lower layer, and rolling the reinforcing material into a molten pool for mixing; and the descending amount and the powder falling amount of the next layer are calculated according to on-line monitoring data, and closed-loop circulation forming is formed. The problems that the volume fraction is not controlled, the reinforcing material is overheated, the material utilization rate is low and variable component forming is difficult are solved, and high-precision, high-efficiency and low-cost integrated forming is achieved.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one alumina oxide matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

This invention relates to the field of insulating aluminum busbar technology, and in particular to an insulating aluminum busbar for high-voltage connection in a power battery system, its preparation method, and its application. An insulating aluminum busbar for high-voltage connection in a power battery system includes: a three-dimensionally bent aluminum alloy substrate; a ceramic insulating layer, which covers the outer surface of the three-dimensionally bent aluminum alloy substrate and is metallurgically bonded to it; and two conductive ends, which are located at both ends of the three-dimensionally bent aluminum alloy substrate, with a nickel sheet fixedly connected to each conductive end and covered with a heat-shrink tubing. This application achieves metallurgical bonding between the ceramic insulating layer and the aluminum substrate, resulting in extremely strong bonding and solving the problem of coating peeling. The two conductive ends located at both ends of the substrate ensure the conductivity of the high-voltage connection and provide secondary protection for the welded area through the heat-shrink tubing, improving connection reliability.

This invention relates to the field of aluminum alloy composite materials technology, and in particular to a method for preparing high-temperature, high-strength SiC fiber-reinforced aluminum matrix composite materials. The method involves a combination of magnetron sputtering and hot isostatic pressing to prepare the SiC fiber-reinforced aluminum matrix composite material. From the inside out, the SiC fiber-reinforced aluminum matrix composite material consists of: a SiC fiber core layer, a carbon layer, a titanium layer, a 2024Al alloy matrix, and a 2024Al alloy cladding. Each layer is continuously distributed along the length of the SiC fibers, forming an integral structure with continuous axial reinforcement and radial gradient bonding. This invention can eliminate interfacial stress between the SiC fibers and the aluminum matrix, control the α-Al grain size and precipitated phases in the aluminum matrix, achieve a uniform arrangement of 50% volume fraction of SiC fibers, and the composite material achieves a room temperature tensile strength of over 1400 MPa, a 200°C tensile strength of over 1300 MPa, and a room temperature compressive strength of over 3200 MPa.

The application is a method for the influence of dislocation dipole defects in aluminum matrix on acoustic parameters, belonging to the technical field of discrete solution, and provides a new molecular dynamics simulation method for researching the changes of ultrasonic velocity, acoustic attenuation and acoustic nonlinear parameters based on two dislocation dipole structures, specifically, the types and quantities of dislocation dipoles in the aluminum matrix are controlled, the atomic scale acoustic simulation is carried out on the dislocation dipole models of different types and quantities by using the phase inversion technology, the cross correlation method is used to extract the sound velocity, the Hilbert transform method is used to extract the sound attenuation, and the FFT method is used to extract the acoustic nonlinear parameters for the four-phase signals, so as to realize the precise extraction of acoustic parameters. Based on the fitting relationship between the three acoustic parameters and the dislocation defects, the contribution of the dislocation defects to the acoustic parameters is determined, and the prediction from the acoustic parameters to the defect characteristics is realized.

The invention discloses a graphene aluminum-based composite enameled wire and a preparation method thereof, and belongs to the technical field of metal-based composites.The preparation method comprises the steps that firstly, Cu-rGO anchored by copper nanoparticles is prepared; secondly, carrying out hydroxylation and sulfhydrylation surface modification on the aluminum powder; then, Cu-rGO, zirconium-aluminum alloy powder and the modified aluminum powder are mixed, and a reinforcement is evenly anchored on the surface of the aluminum powder through the S-Cu specific coordination effect; and finally, carrying out vacuum hot pressed sintering, hot extrusion, cold drawing and painting. According to the preparation method, the strategy of first coordination anchoring and then in-situ interface reconstruction is adopted, in the high-temperature sintering process, a chemically-bonded gradient transition interface is formed, and the wettability and combination problems of graphene and an aluminum matrix are solved; and meanwhile, the Zr element in the zirconium-aluminum alloy is subjected to in-situ precipitation in the aluminum matrix through solid diffusion to form an Al3Zr reinforced phase which is dispersively distributed, the phase can effectively pin the grain boundary, and the high-temperature creep resistance of the material is remarkably improved.