70 results about "Copper matrix composites" patented technology

The invention discloses a method for detecting pesticide based on a colorimetric sensing array of a copper-based MOF composite material, and relates to the technical field of pesticide detection.The method comprises the steps that a Co, Zn and Cu-MOF (VB2) composite nano-enzyme material with peroxidase-like activity and laccase-like activity is prepared; before and after a pesticide analyte to be detected is added, the peroxidase-like activity and laccase-like activity of the Co, Zn and Cu-MOF (VB2) composite nano-enzyme material catalyze different substrates in a neutral environment, so that catalytic products have different colorimetric responses to detect the pesticide analyte to be detected. The method can be used for simultaneously distinguishing and detecting five pesticides including carbendazim, pendimethalin, thiophanate-methyl, triadimefon and acetamiprid, and has the advantages of simplicity and convenience in operation and high detection speed.

The invention discloses a high-strength and high-conductivity nickel-loaded reduced graphene oxide reinforced copper-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: firstly, preparing nickel-loaded reduced graphene oxide powder, then atomizing the nickel-loaded reduced graphene oxide powder, adding the atomized nickel-loaded reduced graphene oxide powder into a copper melt, and applying a synergistic effect of an alternating magnetic field and a direct-current electric field to realize enhanced phase directional alignment and interface strengthening; and finally, through homogenizing annealing, circular machining of'multi-pass cold drawing deformation and intermediate annealing ', rotary swaging and low-temperature aging treatment, the composite material which is uniform in structure and tight in interface bonding is obtained. The material has high strength and high conductivity, the tensile strength of the material is not lower than 700 MPa, the conductivity of the material is not lower than 80% IACS, and the material is suitable for high-requirement electrical materials and electronic interconnection and aerospace conductor components.

The invention discloses a graphene quantum dot reinforced copper-based composite material and a preparation method thereof. The preparation method of the graphene quantum dot reinforced copper-based composite material comprises the following steps: (1) taking itaconic acid and ethidene diamine as precursors, synthesizing graphene quantum dots GQDs through a hydrothermal method, and centrifuging, dialyzing and freeze-drying to obtain GQDs powder; (2) preparing the graphene quantum dot GQDs powder into GQDs / Cu2O composite powder through a molecular-level blending method; and (3) the GQDs / Cu2O composite powder is annealed and reduced into GQDs / Cu composite powder in the Ar / H atmosphere, then vacuum ball milling and spark plasma sintering treatment are conducted, and the block GQDs / Cu composite material is prepared. The method disclosed by the invention is green, safe and low in cost, and the prepared composite material is uniform in GQDs dispersion and strong in interface bonding, has excellent conductivity and corrosion resistance, and is suitable for the fields of electronics, electrics, aerospace and the like.

The invention provides a copper-based composite material performance prediction method based on a space-time attention mechanism, and the method comprises the steps: obtaining a microstructure diagram and stress-strain data through molecular dynamics simulation, extracting topological features through a diagram attention network, and dynamically adjusting the parameters of a time sequence convolution network; a cross-space-time attention module is constructed, and bidirectional feedback fusion of space feature screening and time sequence feature optimization is realized; and finally, carrying out dimensionality reduction and nonlinear transformation on the fused features through a full-connection layer, and outputting performance prediction values such as yield strength and Young modulus. According to the method, the precision and reliability of performance prediction of the copper-based composite material can be improved, and efficient and accurate theoretical support is provided for material design and performance optimization.

The utility model provides a kind of fine-grained high-temperature molybdenum copper-based composite material heat treatment temperature control furnace, it is related to temperature control furnace technical field, including furnace body and furnace door, the outside surface of furnace body is fixedly installed air inlet pipe and exhaust pipe, solenoid valve one and solenoid valve two are set on air inlet pipe and air outlet pipe;In the utility model, by fixedly installing filter box at the end of exhaust pipe away from furnace body, filter box cooperates with bearing filter frame and activated carbon layer to filter and handle waste gas generated during heat treatment process, which contains particulate matter, volatile organic compounds and possibly harmful metal compounds and other components, avoid waste gas directly discharging to pollute surrounding environment, also prevent waste gas from affecting air quality in workshop, protect the health of operating personnel and the normal operation of other equipment, help to maintain good production environment, and also convenient to disassemble bearing filter frame by screw rod, clamping block and fixed block and other structures, convenient to replace activated carbon layer in later period.

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The method comprises the following steps: (1) carrying out surface pretreatment on a copper foil; (2) dropwise adding the graphene dispersion liquid on the surface of the copper foil, and drying the copper foil after the graphene dispersion liquid is freely diffused until the graphene dispersion liquid covers the surface of the copper foil; (3) stacking the copper foils in a manner that a graphene layer is arranged between two layers of copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) annealing the hot-pressed composite material to obtain an annealed composite material; (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material; and (6) the rolled composite material is subjected to annealing treatment, and the graphene copper-based composite material is obtained. On the basis of simplifying the preparation process and reducing the preparation demand conditions, the graphene is promoted to effectively and fully exert the strengthening effect, and the comprehensive performance of the composite material in multiple aspects is improved.

The invention relates to the field of copper-based composite materials, and discloses a high-temperature-resistant copper / graphene composite wire and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: S1, by taking a dispersion strengthened copper wire as a processing object, growing graphene on the surface of the dispersion strengthened copper wire to prepare a composite unit; s2, bundling and assembling a plurality of composite units prepared in the step S1 to obtain an assembly, then loading the assembly into a dispersion strengthened copper pipe, carrying out vacuum sealing on two ends, and then carrying out plastic deformation treatment and intermediate annealing treatment to prepare a multi-core composite wire; s3, taking the multi-core composite wire prepared in S2 as a new processing object, and repeatedly executing S1 and S2 to obtain a composite wire; and S4, carrying out annealing treatment on the composite wire rod finally obtained in the step S3 to obtain the high-temperature-resistant copper / graphene composite wire. According to the copper / graphene composite wire prepared through the preparation method, collaborative optimization of high temperature resistance, high strength and high conductivity is achieved.

The invention relates to the technical field of copper alloys, in particular to a high-strength and high-conductivity C19400 copper-based composite material and a preparation method thereof. The method mainly comprises the steps that copper powder, iron powder, copper-phosphorus alloy, modified nano TiC and copper-cerium alloy powder are mixed and then subjected to high-energy ball milling, and the high-strength and high-conductivity C19400 copper-based composite material is obtained through vacuum drying, compression molding, pressure sintering and double-stage aging treatment, and the modified nano TiC is subjected to rare earth Ce precursor coating and weak oxidation heat treatment, so that the high-strength and high-conductivity C19400 copper-based composite material is obtained. And a cerium dioxide film layer is formed on the surface in situ, so that the dispersibility of nano TiC and the interface bonding between the nano TiC and a copper matrix can be improved. Through matching of the raw materials and the preparation steps, the effects of precipitation strengthening, dispersion strengthening and interface strengthening can be effectively coordinated, and the strength, the conductivity and the structure stability of the material are improved.

The invention discloses a high-strength, high-conductivity and high-wear-resistance nickel-plated short carbon fiber reinforced copper-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite materials. The preparation method comprises the following steps: carrying out surface roughening, sensitization and activation pretreatment on short carbon fibers, and then carrying out chemical nickel plating to form a nickel layer; mixing the nickel-plated short carbon fiber with oxygen-free copper zirconium CuZr0. 1 alloy powder, and carrying out cold press molding; and the copper-based composite material is subjected to rapid vacuum hot pressing sintering for 30-60 min at the temperature of 800-900 DEG C and the axial pressure of 30-50 MPa, the obtained copper-based composite material has high strength, high conductivity (80% IACS or above) and excellent wear resistance (the wear rate is smaller than or equal to 1.1 * 10 <-5 > mm < 3 > / m), and the technical problems that a traditional carbon fiber / copper-based composite material is poor in interface bonding and low in conductivity are solved. The method is suitable for high-performance conductive wear-resistant parts in the fields of aerospace, traffic rails and the like.

The invention discloses a material for an electromagnetic rail gun guide rail and a preparation method and application thereof, and belongs to the technical field of copper-based composite materials. The invention relates to a material for a guide rail of an electromagnetic rail gun. The material comprises a 5-20nm nano precipitated phase dispersed and distributed in a copper matrix; the MXene lamellas are continuously distributed on the grain boundary, and the nanometer MAX phase is distributed in the grain; and the nano precipitated phase, the MXene sheet layer and the nano MAX phase form a continuous reinforced network. The Cu-Ti-Be-Co alloy serves as a matrix, and unification of high strength and high conductivity is achieved through the synergistic effect of nanometer precipitated phase strengthening and MAX and MXene strengthening. The yield strength of the composite material reaches more than 700MPa and the conductivity is greater than or equal to 80% IACS (International Annealed Copper Standard) by regulating and controlling the interface combination of MAX and MXene with a matrix and the size and distribution of a nano precipitated phase, and the composite material is suitable for the fields of high-load electromagnetic guide rails, electromagnetic rail guns and the like.

The application relates to the application field of metal powder metallurgy technology and discloses a copper-based composite material metal block capable of resisting impact energy and a preparation process and application thereof. The copper-based composite material metal block is used in impact and collision process tests, and impact energy absorption, reduction or elimination is realized by self-pulverization and disintegration. Raw materials of the copper-based composite material capable of resisting impact energy include, in percentage by mass, 1-95% of atomized copper powder, 0-95% of electrolytic copper powder, 1-15% of tin powder, 1-2% of molybdenum disulfide, 0-3% of graphite, 0-7% of phenolic resin, 0-1% of lithium stearate and 0-1% of magnesium stearate. The above raw materials are mixed, secondarily pressed, sintered and electroplated to form the copper-based composite material. When encountering an impacted metal barrier section, the metal block can absorb the counter-impact energy and disintegrate by itself, so that the running speed instantaneously drops to zero, the metal fragment splashing phenomenon does not occur, and the copper-based composite material does not contain lead metal, so that the whole impact and collision process is harmless to the surrounding environment.

The invention belongs to the technical field of copper-based composite materials, and particularly relates to a copper-based composite material with a reinforced phase of a three-dimensional continuous net structure and a preparation method and application of the copper-based composite material. According to the preparation method of the copper-based composite material, raw material components such as sponge titanium, silicon blocks and pure copper particles are weighed firstly, then part of the pure copper particles, all the sponge titanium and the silicon blocks are prepared into a mother alloy thin strip with a dispersed Ti5Si3 reinforced phase, and the mother alloy thin strip is crushed into particles; next, a copper-based composite melt obtained after smelting of the remaining pure copper particles and the mother alloy particles is poured into a directional gradient cooling device to be cooled, a three-dimensional net-shaped Ti5Si3 reinforced phase structure is formed in the copper-based composite material by regulating and controlling the solidification condition of the copper-based composite melt and controlling the dosage of raw material components, distribution of the Ti5Si3 reinforced phase is controlled, and the strength of the copper-based composite material is improved. The strength, the hardness and the conductivity of the copper-based composite material are improved, meanwhile, the plasticity is also considered, and the copper-based composite material is excellent in comprehensive performance.

The invention relates to the technical field of electrical contact materials, in particular to a copper-based electrical contact composite material for enhancing electric conductivity and heat conductivity through cobalt-mediated interface engineering and a preparation method of the copper-based electrical contact composite material. (2) adding the deoiled copper powder and a conductive polymer into an initiator solution or a buffer solution; (3) filtering and collecting the polymer and the cobalt-coated copper powder; (4) drying the collected composite material precursor; and (5) carrying out hot pressing or pressing sintering to obtain the modified copper-based electrical contact material. A conductive polymer and cobalt ions are complexed and assembled on the surface of copper powder, then high-temperature sintering is performed to obtain the copper-based composite material, and cobalt catalyzes formation of high-quality graphene; the heteroatom-doped graphene is prepared through high-temperature carbonization of the conductive polymer, and the carrier concentration and the interface energy band structure of the material are optimized; and the cobalt bridging copper-carbon interface reduces electron and phonon scattering and improves the electrical conductivity and thermal conductivity of the composite material.

This invention discloses a multi-layered, coaxially aligned diamond particle-reinforced copper-based composite material and its preparation method. The method includes forming a uniform array of V-shaped through-holes on a copper foil using laser processing, mechanical punching, or etching to obtain a copper foil template; embedding diamond particles into the V-shaped through-holes on the copper foil template skeleton; stacking multiple layers of the copper foil template skeleton through interlayer alignment and filling the interlayer gaps with copper powder to form a diamond / copper skeleton preform; and densifying the preform to finally obtain a composite material with preferential thermal conductivity channels in the thickness direction. This invention effectively solves the problems of low out-of-plane thermal conductivity, easy particle agglomeration, and poor structural integrity in copper and diamond composite materials. Furthermore, it allows for array densification or gradient aperture design to optimize heat flow paths according to application requirements.

This invention belongs to the field of copper-based composite materials, and particularly relates to a copper-graphene composite material, its preparation method, and preparation equipment. The copper-graphene composite material preparation equipment provided by this invention includes: a furnace body; a lifting device disposed within the furnace body, the lifting device being equipped with a fixing fixture for vertically fixing a copper rod; a heat-resistant sleeve for placing the copper rod, the lower opening of the heat-resistant sleeve being provided with a fastening clamp; an electromagnetic induction coil disposed within the furnace body, the electromagnetic induction coil being able to electromagnetically induction heat the copper rod in the heat-resistant sleeve above the fastening clamp during the up-and-down movement of the lifting device; and a cooling pool disposed within the furnace body and located below the electromagnetic induction coil, the cooling pool being able to cool the copper rod passing downward through the induction coil during the up-and-down movement of the lifting device. The equipment provided by this invention can be used to prepare macroscopic copper-graphene composite materials, and the preparation process is short, efficient, and economical.

The application discloses a high-speed imaging system and method suitable for an extreme high-temperature and strong radiation environment, the system adopts ZrO2-Y2O3 thermal barrier ceramic, graphene reinforced copper-based composite material and molybdenum alloy packaging to form a multistage heat flow regulation system; meanwhile, an anti-radiation CMOS image sensor based on an SOI process is introduced, and an interference type optical filter structure is supplemented to shield thermal radiation interference, so that the system can stably work at a high temperature of 2000 DEG C and a radiation environment of >=10 6 Rad(Si). The application discloses a high-speed imaging system and method suitable for an extreme high-temperature and strong radiation environment, which is suitable for image acquisition tasks under extreme working conditions such as aerospace, nuclear energy industry and deep space exploration, and has significant technical advantages and industrial promotion prospects.

The invention aims to solve the problem that the copper SLM printing machinability is poor, so that the performance of the copper SLM is seriously influenced. The preparation method comprises the following steps that S1, material preparation is conducted, specifically, high-purity copper powder and high-purity lanthanum hexaboride powder are mixed, and evenly-mixed powder is obtained; s2, the mixed powder is subjected to additive manufacturing forming through the selective laser melting technology; and S3, linear cutting is conducted, specifically, linear cutting is conducted on the printed lanthanum hexaboride / copper composite material workpiece in a linear cutting mode, and the lanthanum hexaboride / copper composite material is obtained. The preparation complexity and cost of the lanthanum hexaboride / copper composite material are greatly reduced, the prepared lanthanum hexaboride / copper composite material is good in compounding effect, high in strength and toughness and high in conductivity, and new possibility is developed for wide industrial application.

The invention discloses a preparation method of a high-densification and high-thermal-conductivity diamond copper-based composite material. The preparation method comprises the following steps: weighing the following components in percentage by mass: 15-49 wt% of diamond single crystal particle powder; 1 to 5 wt.% of silver powder; the preparation method comprises the following steps: mixing the components, putting the uniformly mixed diamond single crystal particle powder, copper powder and silver powder into a vacuum hot pressing sintering furnace, sintering at 962-1085 DEG C to obtain a composite material, and uniformly filling gaps in the composite material with semisolid copper and liquid silver in the sintering process; by adding a small amount of silver powder, the diamond and the copper matrix can be better fused, and improvement of the density of the composite material is facilitated; vacuum sintering is adopted, on one hand, the preparation speed of the composite material is increased, and on the other hand, the silver powder is melted through heating in an extremely short time, gaps are fully filled, and the density of the composite material is improved; as the thermal conductivity of silver is better than that of pure copper, the thermal conductivity of the composite material is further improved after pores are fully filled.

The utility model discloses a high heat conduction composite refractory brick assembly for hydrogen production reformer lining relates to refractory material technical field. The utility model discloses a refractory brick, the high heat conduction mechanism is provided in the refractory brick, the refractory brick both sides all are provided with the mounting mechanism, the high heat conduction mechanism includes the hollow slot of setting in the refractory brick inside, the support plate of fixed connection in the hollow slot inside and the high heat conduction pipe of fixed connection in the hollow slot inside, the mounting mechanism includes the spacing rod of setting in the refractory brick one side. The utility model discloses through spiral high heat conduction pipe design, significantly prolongs the heat flow path and increases the contact area with the refractory brick base body, cooperates the high heat conduction characteristic of copper base composite material, realizes the heat rapid, even transmission to the reaction tube area, and this structure solves the problem of low efficiency of traditional linear heat conduction groove thoroughly, effectively eliminates the circumferential temperature difference of furnace tube, guarantees the catalytic reaction uniformity, and greatly improves the methane conversion efficiency.

The application provides an AlCrCuFeNi high-entropy alloy particle reinforced copper-based composite material, and a preparation method of the material. 15.38 Cr 15.38 Cu 15.38 Fe 15.38 Ni 38.48 ; the high-entropy alloy particles and copper powder are ball-milled to obtain a mixture; wherein the mass percentage of the high-entropy alloy particles is 10-50 wt.%; and the mixture is subjected to spark plasma sintering to obtain the AlCrCuFeNi high-entropy alloy particle reinforced copper-based composite material, and the sintering temperature is 573K-733K. The technical scheme of the application can improve the strength of the composite material while maintaining high electrical conductivity, and the finally obtained composite material exhibits excellent mechanical and electrical properties, and has a wide application prospect.

This invention discloses a copper-based MOF photocatalyst, its preparation method, and its application, belonging to the field of catalyst preparation. This invention pertains to the synthesis of copper-based MOF compounds constructed using defect engineering strategies and their application in photocatalysis to directly convert carbon dioxide into the multi-carbon product acetone. Specifically, it relates to the preparation and application of copper-based MOF composite materials with specific triatomic sites (NH2-Cu-NH2) for the direct conversion of carbon dioxide into the high-value C3 product acetone under visible light irradiation at room temperature.

This invention belongs to the field of copper-based composite material technology, and discloses a lignin-reinforced copper-based composite material, its preparation method, and its application. The method includes the following steps: mixing lignin powder and copper powder uniformly; the amount of lignin powder added is 0.5 wt.%, and the amount of copper powder added is 99.5 wt.% by mass percentage; the uniformly mixed powder is placed in a vacuum drying oven for drying and sieving to obtain composite powder; the composite powder is sintered in a vacuum hot-pressing sintering furnace to obtain a blocky copper-based composite material. This invention, by adding lignin as a precursor to the copper matrix, can fill the voids between the copper matrix particles. Furthermore, during the hot-pressing sintering process, lignin can be transformed into amorphous carbon or graphitized carbon phase, which has a better interfacial bond with the copper matrix, thus serving as a reinforcing phase to improve the overall performance of the composite material.

The invention relates to the technical field of thermal management materials, in particular to a graphene copper-based composite material and a preparation method thereof. The preparation method of the graphene copper-based composite material comprises the following steps: depositing graphene on a copper foil to obtain a graphene copper foil base material; superposing a plurality of layers of graphene copper foil base materials to form a plurality of layers of base materials; and the multi-layer base material is heated to 800-1100 DEG C, and meanwhile multi-pass hot rolling is conducted on the multi-layer base material, so that the ductility of the multi-layer strip reaches 20-200%. According to the preparation method of the graphene copper-based composite material, graphene sheet layers can be actively and controllably guided to achieve uniform dispersion and height orientation arrangement in a copper matrix, so that an efficient and continuous internal heat conduction network is constructed, and the heat conductivity of the composite material is improved in a breakthrough mode.

The utility model provides a laminated copper-based composite material structure. The laminated copper-based composite material structure sequentially comprises a substrate layer, a transition layer and a mixing layer from bottom to top, the substrate layer is a copper layer; the transition layer is a tungsten layer; the mixed layer is composed of a copper mesh loaded with diamond particles and a copper powder layer; the diamond particles are uniformly dispersed on the copper net and are in contact with the transition layer; and the copper net and the diamond particles are uniformly distributed in the copper powder layer. According to the laminated copper-based composite material structure disclosed by the utility model, the wear-resistant layer containing the diamond particles is formed on the copper layer substrate layer and the transition layer, so that the problems that the cost is higher and the diamond coating is easy to crack in the prior art are solved, and the wear resistance of the laminated copper-based composite material structure is further improved.

A method for reinforcing copper-based composite materials based on the MAX phase includes the following steps: (1) powder pretreatment; (2) high-temperature reduction; and (3) spark plasma sintering. This invention incorporates the MAX phase Ti4AlN3, which enhances the mechanical properties of copper-based alloys due to its high elastic modulus, good high-temperature plasticity, and thermal shock resistance. Traditional ball milling easily generates a large amount of heat, and the relatively soft copper material causes copper powder to agglomerate, resulting in a large particle size. This invention replaces the powder with a suspension, transferring the heat generated during ball milling by adding ethanol and isolating it from air. Sodium dodecylbenzoate is used as a dispersant, reducing the powder's agglomeration ability and accelerating the ball milling process. The combined effect of plasma activation and sintering densification refines the grain size of the alloy, ultimately producing a dense Cu-Ti4AlN3 composite material with superior mechanical properties and wider applications.

The invention provides a high-performance copper-based composite material and a preparation method thereof, and belongs to the field of material preparation. According to the invention, dendritic electrolytic copper powder is used as a matrix, graded SiCp is used as a reinforcing phase, secondary reduced foam iron powder is used as a friction adjusting component, graphite is used as a lubricating component, matrix / component collaborative design of morphology synergy, performance matching, process adaptation and function complementation is adopted, and double-motion mixing, bell jar type pressure sintering and cryogenic circulation grading aging treatment processes are combined, so that the wear-resistant and wear-resistant corrosion-resistant copper alloy material is obtained, and the service life of the wear-resistant and wear-resistant corrosion-resistant corrosion-resistant copper alloy material is prolonged. The technical problems that an existing brake material is high in raw material cost, poor in friction stability, large in brake noise and short in service life are effectively solved. The density of the prepared composite material is larger than or equal to 99.5%, the bending strength is larger than or equal to 430 MPa, the conductivity is larger than or equal to 48.2% IACS, the friction coefficient is stabilized to be 0.33-0.37, the abrasion loss is smaller than or equal to 0.25 cm / MJ, the braking noise is reduced by 15-20 dB, the service life is 30-400 thousand kilometers, and the composite material is suitable for multi-scene braking systems such as high-speed trains, medium-speed trains, subways, heavy machinery and freight trains with the speed being 350 km / h or above.

The invention belongs to the technical field of novel composite materials, and relates to a dispersion strengthened copper-based composite material prepared based on glass softening and a preparation method thereof.The preparation method comprises the following steps that S1, reinforced phase nanoparticles and nano glass raw material powder are evenly mixed through high-pressure airflow, then briquetting sintering treatment is conducted, and a reinforced phase glass block is obtained; s2, the copper-based alloy is smelted to obtain a copper melt, and chlorine salt is added before smelting is started to protect the copper melt from being oxidized; raising the temperature to a specified value to melt copper into a melt, adding the reinforced phase glass block to form a glass viscous body, keeping the temperature for a certain time, and starting stirring to fully mix a glass softening body with the copper melt; and S3, after stirring is stopped and standing is conducted for a certain time, casting forming is conducted, and the dispersion strengthened copper-based composite material is obtained. According to the prepared composite material, nanoparticles can be uniformly distributed in a metal matrix, and the mechanical property of the material is effectively improved only on the premise of sacrificing extremely little conductivity (namely, the conductivity is larger than or equal to 90% IACS).

The invention discloses a graphene and aluminum oxide synergistically reinforced copper-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite material preparation. According to the method, dispersed nano-particles are formed in a copper matrix through internal oxidation-reduction, the surface is removed through selective pickling, a pure copper surface layer is exposed, then the surface of powder is coated with high-quality graphene through a CVD technology, and then the high-performance composite material is obtained through cold isostatic pressing, protective atmosphere sintering and hot extrusion densification. According to the composite material, 10-50 nm particles are distributed in a dispersed mode, graphene is of a 1-5-layer structure, the density is larger than or equal to 99.2%, the tensile strength ranges from 365 MPa to 485 MPa, the conductivity ranges from 78% to 92% IACS, and collaborative optimization of the strength and the conductivity is achieved. The preparation method is suitable for large-scale production and can be widely applied to the fields of electric power, electronics, rail transit and the like.

The invention discloses a high-strength wear-resistant copper-based composite material and a preparation method thereof. The composite material is composed of a copper matrix, reduced graphene oxide and a nano titanium carbide reinforced phase, wherein the reduced graphene oxide and the nano titanium carbide reinforced phase are uniformly dispersed in the copper matrix. The preparation method comprises the following steps: firstly, uniformly mixing the copper powder, the reduced graphene oxide and the nano titanium powder in a ball milling manner; then putting the mixed powder into a vacuum hot-pressing sintering furnace, and densifying at high temperature and high pressure to obtain a sintered block; and finally, the sintered block is subjected to hot rolling deformation and annealing treatment, and the final copper-based composite material is obtained. The preparation method is characterized in that nano titanium is introduced to serve as an interface modifier and can effectively improve the interface bonding property between copper and graphene, meanwhile, authigenic nano titanium carbide plays a dispersion strengthening role, and the authigenic nano titanium carbide and the strengthening and toughening effect of graphene cooperate to jointly strengthen a copper matrix. And through the process combination of hot pressing sintering and hot rolling annealing, the wear resistance of the material is remarkably improved while the high strength of the material is ensured.

The application provides a Ti3C2T x Ag composite particle reinforced copper-based self-lubricating material and a preparation method thereof, and relates to the technical field of metal matrix composite materials. The method comprises the following steps: etching Ti3AlC2 powder to obtain multilayer Ti3C2T x particles; then, silver particles are plated on the surfaces of the Ti3C2T x particles by a chemical plating process to obtain Ti3C2T x Ag composite particles; and finally, the composite particles are mixed with copper-based powder, and the mixture is formed and sintered by a powder metallurgy process to obtain Ti3C2T x Ag composite particle reinforced copper-based self-lubricating material. The application solves the problems of easy agglomeration of Ti3C2T x and silver particles in the matrix and uneven dispersion by constructing a core-shell structure of the reinforcing phase, realizes lubrication synergy of the two at different temperatures, and has the advantages of simple operation, economy, good repeatability, excellent tribological performance of the prepared material, and widened application of copper-based composite materials.