136 results about "Copper matrix composites" patented technology

The invention provides a power management chip pin state intelligent detection method and system. The method comprises the steps that temperature difference quantity is input into a gradient heat conduction compensation structure, and compensation current opposite to a temperature gradient vector is generated based on temperature field distribution in the copper-based composite material; superposing and coupling the voltage fluctuation signal and the compensation current to generate a reference voltage signal; performing frequency component separation processing on the reference voltage signal, and extracting electromagnetic interference characteristic data in a frequency component; performing time sequence correlation on the electromagnetic interference characteristic data and the temperature distribution data, dynamically adjusting an interference suppression parameter through closed-loop control, and acting the adjusted interference suppression parameter on an interference suppression process of a reference voltage signal to generate a pin state detection signal; and detecting the pin state of the power management chip according to the pin state detection signal. According to the invention, the pin voltage stability and the state detection precision of the power management chip are improved.

The invention discloses a polylactic acid injection molding mold based on a gradient heat conduction composite structure and a heat management method thereof, and belongs to the technical field of high polymer material molding processing equipment.The polylactic acid injection molding mold comprises a) a surface high heat conduction layer which is made of a copper-based composite material, has the heat conduction coefficient larger than or equal to 400 W / m.K and is used for rapidly and directionally transferring heat to the surface of a mold cavity; and b) an intermediate transition layer composed of a titanium alloy porous structure. High-efficiency production is realized through innovative design and advanced technology. Integrated metallurgical bonding of the gradient heat conduction structure is achieved through the selective laser melting technology, and the heat flow directivity is enhanced; the dual-mode cooling system is combined with closed-loop temperature control, and the temperature is accurately regulated and controlled; the high-performance material improves the comprehensive performance of the mold; and the structural stability is guaranteed through accurate technological parameters. According to the thermal management method, through multi-physical field simulation optimization, rapid heating and cooling are achieved, the forming period is shortened to 16-18 seconds, the calculation efficiency is improved by 80%, and the production efficiency and the product quality are effectively improved.

The invention discloses a Cu-Cr-Zr-TiB2 copper-based composite material and a preparation method and application thereof. A blank containing TiB2 particles is subjected to rotary forging to obtain a rotary forging piece, the rotary forging piece is subjected to primary aging treatment and then subjected to electric pulse drawing to obtain a drawing piece, and then the drawing piece is subjected to secondary aging treatment to obtain the Cu-Cr-Zr-TiB2 copper-based composite material. According to the Cu-Cr-Zr-TiB2 copper-based composite material prepared through the preparation method, the copper matrix is of a gradient structure with the surface layer being a nanocrystalline layer of 50-200 nm and the core part being fine grains of 0.5-1 micron, TiB2 particle reinforced phases are distributed in the copper matrix in a fibrous mode in the axial direction, and Cr / Zr nano precipitated phases are distributed in gaps of the TiB2 particle reinforced phases and in crystals of the copper matrix in a dispersed mode; therefore, the high-hardness, high-strength, high-conductivity, high-softening-temperature, excellent high-temperature performance and excellent arc extinguishing performance are achieved.

The invention discloses a regulation and control method and a preparation method of in-situ ceramic particles of a copper-based composite material. The method comprises the following steps: weighing according to a reaction equation and a reaction molar ratio; the molar ratio coefficient is changed, trace alloy is added, and the size and morphology of in-situ particles are regulated and controlled; the copper-based pre-dispersed in-situ ceramic intermediate alloy reinforcer is prepared through powder mixing, cold pressing and sintering; crushing the reinforcer, remelting, stirring and casting; and after the cast alloy is subjected to heat treatment, the high-performance in-situ particle reinforced copper-based composite material is prepared. According to the obtained in-situ ceramic intermediate alloy reinforcer, pre-dispersion of ceramic particles in a copper matrix can be achieved, and good combination of the particles and the matrix is achieved by adding the copper-based pre-dispersion in-situ ceramic intermediate alloy reinforcer into a molten matrix alloy; interface pores caused by sharp corners, surface pollution and the like of the heterogeneous particles in an external addition method are avoided, and the strengthening effect of the heterogeneous particles is weakened.

The invention discloses a preparation method of graphene-coated aluminum oxide nanoparticles and a reinforced copper-based composite material thereof, and belongs to the field of metal-based composite materials, graphite flakes are stripped into graphene through a wet ball-milling one-step method, the graphene coats the surfaces of aluminum oxide particles, then the graphene is mixed with nano copper powder, and the mixture is formed through a powder metallurgy process; according to the method, the traditional multi-step process is simplified, and the composite material has high wear resistance and excellent functional characteristics by utilizing the lubricity and electric conductivity / thermal conductivity of graphene, and is suitable for the high-end fields of heat dissipation of electronic devices, sliding bearings and the like.

The invention discloses a preparation method of a refractory metal reinforced copper-based composite material EBSD sample. The method comprises the following steps: 1, carrying out linear cutting to obtain a to-be-treated original sample; 2, performing thermal inlaying on the sample; 3, mechanical grinding; 4, vibration polishing; 5, chemically and mechanically polishing; and sixthly, cleaning and blow-drying are conducted, and the refractory metal reinforced copper-based composite EBSD sample is obtained. Scratches and defects of the sample are removed through vibration polishing, and synergistic regulation and control of the corrosion rate are achieved and tiny corrosion pit defects on the surface of the sample are eliminated by means of the oxidation effect, the complexing effect and the corrosion inhibition effect of the chemical mechanical polishing solution on the two phases of the heterogeneous refractory metal reinforced copper-based composite material. The sample surface is kept in a flat, smooth and low-stress state, the sample surface quality is remarkably improved, the analysis rate of the obtained EBSD sample is high, and the method has the advantages of being practical, efficient and low in cost.

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 preparation method of an MXene reinforced Cu-based composite material with strong interface bonding, and belongs to the technical field of composite material preparation. According to the method, an MAX phase material is adopted, few layers of MXene are mixed with copper salt, and MXene with Cu or Cu2O single or mixed nano-particles uniformly deposited is formed; then mixing with copper powder or copper ions to obtain MXene / Cu composite powder; and finally, the MXene / Cu composite material with strong interface bonding is obtained through sintering. According to the preparation method, the spontaneous reduction deposition reaction of MXene with high reaction activity and Cu ions is utilized, and the structure and distribution of deposited nano-particles are subjected to interface regulation and control, so that tight interface combination between a copper matrix of the composite material and MXene is realized, inelastic scattering of carriers at an interface is reduced, the interface load transmission capacity is enhanced, and the mechanical property of the composite material is improved. Therefore, the strengthening efficiency of the MXene on the copper matrix is obviously improved; the prepared copper-based composite material has excellent mechanical and electrical properties, the yield strength of the copper-based composite material ranges from 295 MPa to 564 MPa, and the electric conductivity of the copper-based composite material is kept at 84.5%-94.5% IACS (International Annealed Copper Standard). The composite material is simple in preparation process and low in cost, and has the potential of large-scale industrialization.

The invention discloses a method for evaluating and strengthening interface characteristics of a copper-based composite material, and relates to the technical field of copper-based composite materials. A soil solution and carbon quantum dots are prepared, and the carbon quantum dots are added into the soil solution; the method comprises the following steps: simulating a corrosion process of copper-based composite materials with different aluminum contents in soil solutions with different carbon quantum dot contents, and carrying out polarization curve and electrochemical impedance spectroscopy analysis on the corroded copper-based composite materials by adopting an electrochemical workstation to obtain charge transfer resistance and impedance modulus values of the copper alloy composite materials; meanwhile, SEM, EDS and three-dimensional surface contour analysis are combined, and the surface morphology and roughness of the copper-based composite material are obtained; according to the method, the electrochemical method and the corrosion surface characterization method are combined, the change of the surface and interface characteristics of the copper-based composite material corresponding to different matching materials can be rapidly evaluated, so that the purpose of protecting the alloy material is achieved, and aluminum and carbon quantum dots are found to be capable of synergistically promoting the protection of the copper-based composite material.

The invention relates to the field of friction materials, in particular to a preparation method of a high-temperature and high-strength copper alloy-based composite material for an alloy-reinforced high-iron brake pad. The high-temperature and high-strength copper alloy-based composite material for the high-iron brake lining is prepared by using a matrix alloy strengthening method, a high-temperature and high-strength Cu-Ni-Al alloy is strengthened by using an alloying element Si, and the Cu-Ni-Al-Si alloy is used as a matrix material; feCu30 is used as a matrix strengthening component; crFe and SiO2 are used as friction increasing components; graphite (flake) and MoS2 are used as anti-attrition components. The Cu-Ni-Al-Si alloy powder is prepared from the following raw materials in percentage by mass: 40 to 60 percent by weight of Cu-Ni-Al-Si alloy powder, 20 to 35 percent by weight of FeCu30 powder, 5 to 15 percent by weight of CrFe powder, 5 to 20 percent by weight of graphite powder, 0.5 to 5 percent by weight of MoS2 powder and 0.5 to 5 percent by weight of SiO2 powder. After the raw material powder is uniformly mixed, cold press molding is carried out, and hot pressed sintering is carried out under a vacuum condition. Compared with a commercial pure copper-based composite material and a Cu-Ni-Al-based composite material, the hardness and the strength of the high-temperature and high-strength Cu-Ni-Al-Si-based composite material are improved, and the friction coefficient stability and the wear resistance are remarkably improved.

The invention relates to a wire preparation method of a copper-based composite material, belongs to the technical field of material science and engineering, and particularly relates to a preparation and processing technology of a high-performance metal material. On the basis of a novel friction stirring extrusion process, a strengthening phase is sheared and uniformly dispersed and distributed in a copper matrix through the friction stirring effect, the problem that second-phase particles are not uniformly dispersed is solved, meanwhile, the diameter of the wire can be accurately controlled, controllable preparation of the copper-based composite wire with the micron-sized diameter is achieved, and the production cost is reduced. And hot cracks and surface defects in a traditional process are avoided, the strength and plasticity of the material are remarkably improved, and the requirement for the copper-based composite wire in the high-performance field is met.

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 present invention relates to a method for preparing a novel high-strength and high-wear-resistant boron nitride (BNNS) reinforced copper-based composite material, and belongs to the technical field of composite material preparation. The present invention first adopts a molecular level mixing method (MLM) to prepare a BNNS@Cu composite reinforcement, and then mixes it with a trace amount of nano-Ti powder and obtains a BNNS@Cu‑(Ti) composite powder by low-energy ball milling. The above-mentioned composite powder is uniformly mixed with a Cu melt to obtain a BNNS@Cu‑(Ti) / Cu composite block. Finally, the composite block is subjected to thermal deformation treatment to obtain a uniformly organized BNNS@Cu‑(Ti) / Cu composite material. The preparation process of the present invention is simple and practical. The copper-based composite material obtained by the method exhibits excellent mechanical properties and wear resistance, and can still maintain good electrical conductivity, which provides technical guidance for the development of high-performance copper-based composite materials for application in brush materials, pantograph slide materials, electrical contact materials and friction materials.

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 relates to the technical field of copper-based composite material preparation, and discloses a vacuum hot-pressing copper-based composite material preparation process which comprises the following steps: step 1, pre-treating tungsten powder, molybdenum powder, chromium powder, tin powder, zinc powder and copper powder, adding the tungsten powder, the molybdenum powder, the chromium powder, the tin powder and the zinc powder into the copper powder, mixing and stirring to obtain a mixed material; then copper-based composite powder is prepared through vacuum ball milling; 2, the copper-based composite powder and pure copper powder are subjected to cold press molding; and thirdly, the copper-based composite material blank formed through cold pressing is loaded into a heat-resistant stainless steel 310S mold. The copper-based composite powder and the pure copper powder are subjected to cold press molding, the cold press molding pressure is small, the efficiency is high, the cold press molding method is suitable for batch production, the heat-resistant stainless steel 310S mold is arranged, so that a copper-based composite material blank can be conveniently loaded, and the heat-resistant stainless steel 310S mold is reasonable in structural design, suitable for batch hot pressing, high in production efficiency, low in cost, stable in quality and suitable for large-scale production. The method is suitable for batch production.

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 present invention discloses a graphene / basalt fiber multi-scale material, its preparation method and application, which include the following steps: (1) React graphene oxide with an amino silane coupling agent in the presence of a solvent to obtain amino-functionalized graphene oxide; successively perform degumming and roughening treatments on basalt fibers to obtain pretreated basalt fibers; (2) Disperse the amino-functionalized graphene oxide obtained in step (1) in an organic solvent to obtain a dispersion, immerse the pretreated basalt fibers in the dispersion, filter and wash them, and then perform drying treatment under hydrogen conditions to obtain the graphene / basalt fiber multi-scale material. For the graphene / basalt fiber multi-scale material prepared by the present invention, graphene is uniformly and firmly modified on the fiber surface, and the surface-modified graphene has a low oxygen content, and it can be used as a reinforcing material in copper-based composites, which can effectively improve the bonding strength between basalt fibers and the copper matrix.

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 invention discloses a method for preparing a nano copper-based composite material through two-step sintering, and belongs to the technical field of copper-based composite material preparation, Cu-Ti powder and B powder are used as original powder, precursor powder is obtained through high-energy ball milling, and a TiB2 / Cu composite material is prepared through the two-step sintering method. According to the method for preparing the nano-copper-based composite material through the two-step sintering, the nano-particles are formed through low-temperature sintering, sintering densification is achieved under the condition that the nano-particles are sintered at high temperature to inhibit grain coarsening, and the key technical problem that base body nano-grains grow up in the traditional high-temperature sintering process is solved; the mechanical property of the copper-based composite material is remarkably improved through the obtained nanocrystalline copper matrix and the nanometer dispersion particles together.

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 discloses a preparation method of an in-situ nitrogen-doped graphene reinforced copper-based composite material based on external pyrolysis, and relates to the technical field of metal-based composite material preparation. The method specifically comprises the following steps that copper powder is placed in a heating device, and a solid nitrogen-containing carbon source is placed in an external pyrolysis device; after the system is vacuumized and cleaned, inert gas and hydrogen are introduced, and the heating device is heated to a specific temperature and is subjected to heat preservation. An external pyrolysis device is started, the temperature is increased to the pyrolysis temperature, a nitrogen-carbon-containing small molecule precursor is generated and conveyed into a heating device, in-situ growth is conducted on the surface of the copper powder, and high-dispersion composite powder is prepared; and sintering the powder to obtain the densified high-dispersion nitrogen-doped graphene / copper composite block material. According to the method, the in-situ uniform growth of the nitrogen-doped graphene on the surface of the copper powder is realized through a solid nitrogen-containing carbon source external pyrolysis technology in combination with a synergistic mechanism of copper powder regulation and control, precursor directional transportation and in-situ doping growth, and a new way is provided for controllable synthesis of the copper-based composite material.

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.