565 results about "Metal matrix composite" patented technology

The invention provides a metal matrix composite microstructure strengthening simulation method and system, and relates to the technical field of composite mechanical property simulation, and the method comprises the following steps: establishing a polycrystalline aluminum matrix atomic model and a spherical silicon nitride particle strengthening phase atomic model unit; embedding the spherical silicon nitride particles into the polycrystalline aluminum matrix according to the target embedding position coordinates, and integrating to generate an atomic scale structure model; according to the method, an embedded atom potential function is adopted to describe interaction among atoms in a polycrystalline aluminum matrix, a Tersoft potential function is adopted to describe covalent bond interaction among atoms in spherical silicon nitride particles, and a Lennard-Jones potential function is adopted to describe interaction among heteroatoms at a Si3N4 / Al interface; based on the interaction potential between atoms, molecular dynamics simulation is adopted for conducting uniaxial stretching simulation on the atomic scale structure model, mechanical property parameters of the particle reinforced metal matrix composite are obtained through calculation, and a visualization method is combined for analyzing the microcosmic strengthening mechanism of the particle reinforced metal matrix composite.

The invention discloses a defect detection system for a metal-composite material mixed structure device. The defect detection system comprises an industrial control computer, a mechanical scanning arm, a polarization detection probe, an ultrasonic detector assembly and a power supply, the invention further provides a defect detection method for the metal-composite material mixed structure device. The defect detection method specifically comprises the following steps: acquiring polarization image information of the metal surface; solving polarization image parameter information; carrying out surface defect detection; metal internal ultrasonic detection information is obtained; performing internal defect detection; and performing multi-mode data fusion detection. According to the invention, two information sources with complementary advantages, namely polarization and ultrasound, are selected as detection information sources of the multi-modal detection method, so that all-directional defect detection and visualization on the surface-interior of the metal-based composite material mixed structure device are effectively realized; and a feasible technical method is provided for engineering application of polarized light / phased array ultrasonic multichannel integrated detection.

The invention belongs to the technical field of metal matrix composite materials, and relates to a tungsten-copper three-dimensional orthogonal woven composite material and an intelligent design method thereof.The composite material comprises a space interwoven network structure formed by tungsten fiber skeletons arranged in the X orthogonal direction, the Y orthogonal direction and the Z orthogonal direction, and the tungsten fiber skeletons are wrapped by a copper matrix to form a three-dimensional heterogeneous composite system; the method comprises the following steps: generating a composite material structure based on parametric modeling, acquiring mechanical and electrical performance data by utilizing finite element and multi-physics field simulation, and constructing a structure-performance data set; performing performance prediction by adopting three types of machine learning models, namely ANN, SVR and LightGBM, and determining an optimal model in combination with Bayesian optimization; performing parameter reverse screening based on the optimal agent model, screening a structural combination meeting performance constraints, and constructing a closed-loop optimization process through simulation verification and model iteration; according to the method, efficient design and accurate performance prediction of the composite material structure can be realized, and the method is suitable for high-performance electromagnetic structural materials.

The invention discloses a stirring friction additive manufacturing device and method, relates to the technical field of additive manufacturing, and aims at solving the problems that in existing additive manufacturing, reinforced phases are not evenly distributed, an additive device is prone to being abraded, and the performance of a deposited material is degraded The device partially comprises a stirring head, a follow-up sleeve, a liquid cooling pipe and a metal matrix composite raw material rod. The follow-up sleeve is nested on the outer side of the stirring head, the liquid cooling pipe is used for continuously cooling and controlling the temperature of an additive tool and is mounted on the outer wall of the follow-up sleeve, the metal matrix composite raw material rod is fed to the stirring head, and pre-mixed powder of gel and a corrosion inhibitor is added into the metal matrix composite raw material rod to be combined with the metal slim pipe, so that the additive tool can be continuously stirred. The problem of uniform distribution of the reinforced phase of the aluminum-based composite material is solved, and meanwhile, the corrosion-resistant design of the deposited material is realized. The method is wide in application range, and can be suitable for reliable solid-phase deposition manufacturing of various low-volume-fraction metal-based composite materials such as aluminum-based, magnesium-based, copper-based and zinc-based composite materials.

The invention belongs to the field of continuous SiC fiber reinforced metal matrix composite materials, and particularly relates to a SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material and a preparation method of the SiCf / TiMoNb-Ti2AlNb laminated composite material. The composite material is of a hot isostatic pressing composite structure of a precursor wire and a Ti2AlNb sheath outside the precursor wire, the precursor wire is formed by uniformly distributing SiC fibers in a TiMoNb-Ti2AlNb laminated alloy matrix, the volume fraction of the SiC fibers accounts for 40-55% of the total volume fraction of the SiCf / TiMoNb-Ti2AlNb / Ti2AlNb laminated composite material, and the composite material is good in combination, compact and free of holes. Through the introduction of the TiMoNb-Ti2AlNb lamination layer, the composite material can be compact under a relatively low hot isostatic pressure parameter, and the effect of improving the performance can be achieved after process parameters are optimized.

The invention belongs to the technical field of metal-based composite material preparation, and particularly relates to a method for treating a high-volume-fraction particle reinforced aluminum-based surface through friction stir. In order to solve the problems of particle aggregation, uneven distribution and the like in the preparation process of a high-volume-fraction particle reinforced aluminum-based composite material in the prior art, the invention innovatively introduces a method for mixing and adding solid lubricating particles with two-dimensional layered structures and hard particles. According to the method, the interface regulation and control effect of the two-dimensional layered particles is used in cooperation with the special stirring head, uniform distribution of the hard particles in the composite layer is effectively promoted, the hole defect caused by particle aggregation is remarkably reduced, and controllable preparation of the high-volume-fraction particle reinforced aluminum matrix composite is achieved. And subsequent solid solution and aging heat treatment are combined, so that the comprehensive mechanical property and wear resistance of the material are further improved. The method is simple in process and easy to implement, and has good engineering application value.

The present application relates to the technical fields of laser additive manufacturing, and discloses a kind of metal matrix composite composite additive manufacturing methods, comprising: the mixing of pre-prepared composite powder, substrate pretreatment, laser bottom layer cladding preparation bottom layer structure;Electron beam selective melting additive preparation main functional layer, obtain rough parts;Rough parts post-processing.The present application improves the wettability between metal matrix and TiC reinforcing phase through the transition effect of laser cladding bottom layer and hot isostatic pressing post-processing, improves the interface bonding strength, avoids the interface peeling problem under load;Through laser cladding, realize rapid bottom layer forming, electron beam selective melting ensures high-precision functional layer manufacturing, and is suitable for the integrated manufacturing of complex structure (such as hollow, thin-walled) metal matrix composite parts.

The invention discloses a gradient gradual change type powder reinforced metal matrix composite material and a preparation method and application thereof, and the gradient gradual change type powder reinforced metal matrix composite material is composed of a metal matrix and gradient gradual change type powder dispersed in the metal matrix. The gradient gradual change type powder sequentially comprises a core carbon material, a transition layer, a gradual change layer and a modification layer from inside to outside, a compound or a solid solution is formed at an interface, so that the binding force and heat resistance of the material are enhanced, the gradient gradual change coating is formed from inside to outside, interface stress is reduced, good metallurgical bonding with a matrix can be achieved, and the service life of the material is prolonged. The service life of the material is prolonged, so that the comprehensive performance of the composite material is remarkably improved.

The invention discloses an anti-deformation industrial furnace water beam structure made of a gradient composite material and a preparation method. The water beam structure sequentially comprises a high-temperature-resistant gradient layer, a thermal stress buffer layer and a heat conduction base body layer from outside to inside. Wherein the high-temperature-resistant gradient layer is composed of a ceramic and / or metal ceramic material, and the components of the high-temperature-resistant gradient layer are in continuous or stepped transition from the outer surface to the inside in the thickness direction to form a metal material for resisting high-temperature oxidation and hot corrosion; the thermal stress buffer layer is composed of a metal-based composite material, the coefficient of thermal expansion (CTE) of the thermal stress buffer layer is between that of the high-temperature-resistant gradient layer and that of the heat-conducting matrix layer, and the thermal stress buffer layer is used for relieving And the heat-conducting matrix layer is made of a high-heat-conductivity metal material and is used for rapidly conducting out heat. Through collaborative optimization of materials and structures, the problems that a traditional water beam is concentrated in thermal stress and poor in thermal shock resistance are solved, and the water beam is suitable for long-term stable operation of a high-temperature industrial furnace.

The invention discloses an enhanced metal-based composite water purifying agent and a preparation method thereof, belongs to the technical field of preparation of water purifying agents, and aims to solve the technical problem that the flocculation capacity and the stability of a composite water purifying agent in the prior art need to be further improved. The preparation method specifically comprises the following steps: preparing a water purifying agent skeleton dispersion liquid by using chitosan and sodium alginate; chitosan-sodium alginate is used as a porous framework, a polyphenol-multi-metal complex is loaded, a structure is enhanced through Ca < 2 + > crosslinking, then SiO2 is used for coating to improve acid and alkali resistance and stability, and finally PAC is introduced to realize rapid flocculation. In the preparation process, the organic framework, the metal complex and the inorganic coating layer are fully compounded through pH control and step-by-step dropwise adding, and the obtained composite water purifying agent can efficiently remove phosphorus, chromium and suspended solids in water and shows a remarkable synergistic purification effect and storage stability.

The invention relates to the technical field of additive manufacturing of metal matrix composites, and provides a laser stirring wire feeding additive manufacturing device and method for particle reinforced aluminum matrix composites, and the additive manufacturing device comprises a laser wire feeding head, a base plate, a rotating shaft, a laser part and a magnetic field auxiliary system; the laser wire feeding head can move along the Y axis and the Z axis, the base plate is installed on the rotating shaft and can rotate around the Y axis along with the rotating shaft, a wire is arranged in the middle of the laser wire feeding head, and the laser part can emit laser. By adjusting the relative position of the laser wire feeding head and the substrate, the tail end of the wire and the laser can be converged on the substrate, and then additive manufacturing is achieved. By means of the magnetic field force and the wire stirring oscillation effect, the flowing state of particles in a molten pool can be effectively controlled, uniform dispersion of the particles is promoted, and therefore the compactness and the mechanical property of the composite material are improved.

The invention discloses equipment and a method for preparing an aluminum silicon carbide (Al-SiC) composite material through a pressure infiltration process, and belongs to the technical field of metal matrix composite material preparation. The efficient pressure preparation equipment for the aluminum-silicon carbide composite material comprises a furnace body, a lower graphite crucible, an upper graphite crucible, a liftable graphite rod, an inflation connector and an exhaust connector, during specific use, an aluminum ingot and a silicon carbide preform are heated respectively and prevented from making contact with each other, so that the interface reaction strength is relieved, and combination of aluminum and silicon carbide is facilitated; after the target temperature is reached, the graphite rod is lifted to open the leak hole, so that the molten aluminum falls into the lower graphite crucible, and under the action of high-pressure gas, the molten aluminum is infiltrated into the silicon carbide prefabricated body, so that the aluminum-silicon carbide composite material is prepared; the problems of low density, poor process stability, violent interface reaction and low bonding strength in the prior art can be solved.

The invention relates to the technical field of metal-based composite materials, and discloses a preparation method of a high-dispersity silicon carbide reinforced aluminum-based composite material, which comprises the following steps: heating and melting an aluminum alloy material, and then vacuumizing; the stirring mechanism extends into the alloy liquid by a specified depth, and the stirring mechanism is started to perform vacuum high-temperature stirring; adding a modificator A, and continuously performing vacuum high-temperature stirring to perform first modification; the pretreated SiC particles are spread on the aluminum alloy liquid at a constant speed; after stirring is completed, a modifier B, a refiner and a deslagging agent are added, and secondary modification, refinement and deslagging are conducted; and releasing vacuum, treating attachments and dross on the surface of the melt, and discharging to cast a product or a cast ingot. According to the preparation method, the addition amount of the SiC particles can be increased to 40%, the dispersion uniformity can be improved to more than 95%, the wettability of the SiC particles can be remarkably improved, and the porosity and oxide inclusion can be reduced, so that the comprehensive performance of the composite material can be improved.

The invention belongs to the technical field of metal-based composite material additive manufacturing, and particularly relates to a graphene titanium-based composite material additive manufacturing method based on machine learning, and the graphene titanium-based composite material additive manufacturing method based on machine learning comprises the following steps: collecting and preprocessing multi-modal data; constructing a multi-target prediction GNN model and carrying out model training and evaluation to obtain an optimal GNN model; the optimal GNN model is optimized through a second-generation non-dominated sorting genetic algorithm, and a multi-objective optimization result is obtained; a qEHVI Bayesian optimization algorithm is adopted to screen out an optimal parameter group from the multi-target optimization results; and 3D printing verification and closed-loop iteration are carried out. According to the method, machine learning prediction, 3D printing verification and data feedback are integrated into a closed-loop iteration system, dynamic optimization of'parameter recommendation-> 3D printing-> performance testing-> model updating 'and autonomous optimization of material performance are achieved, and research and development efficiency is remarkably improved.

The utility model belongs to the technical field of metal matrix composites, and relates to a metal matrix composite preparation device which comprises a metal melting furnace, a reinforcement conveying device and a blowing mixing device, and the reinforcement conveying device is connected with the blowing mixing device so as to convey reinforcements to the blowing mixing device; the injection mixing device is provided with an air inlet and a nozzle communicated with the air inlet, the nozzle is inserted into a cavity of the metal melting furnace, the nozzle is arranged below the liquid level of metal melt in the metal melting furnace, and the nozzle is further communicated with a reinforcing body conveying device. And the reinforcing body is fed into the metal melt in the metal melting furnace through gas introduced into the gas inlet. According to the utility model, the enhanced body is mixed with the gas through the injection mixing device, and then is directly blown into the melt in the metal melting furnace, so that the enhanced body is more uniformly stored in the melt, and the agglomeration is avoided.

A method for friction stir forming a metal matrix composite (MMC) structure (76). The method includes the step of providing a substrate (12) comprising a metallic material and securing a preformed MMC layer (14, 16) comprising an MMC material in a position overlying at least a portion of the substrate (12). The method further includes the step of friction stirring the preformed MMC layer (14, 16) with a friction stirring tool (50) which includes a rotating probe (56), including locating the probe (56) at a stirring depth at which the probe (56) extends through the preformed MMC layer (14, 16) into a portion of the substrate (12) and passing the tool (50) through the preformed MMC layer (14) at the stirring depth to friction stir the preformed MMC layer (14, 16) and integrate the preformed MMC layer (14, 16) with the substrate (12).

The invention belongs to the technical field of metal-based composite materials, and particularly relates to a method for integrally preparing complex-shaped tungsten-copper alloy through injection molding and sintering, which comprises the following steps: mixing and preheating tungsten powder and copper powder; preparing a composite plasticizer matrix, mixing and granulating to obtain a granular mixed material; injecting the granular mixed material into a cavity of a steel mold through an extruding machine at the temperature of 150-200 DEG C; cooling and demolding to obtain a molded blank; the obtained formed blank is heated to 800-900 DEG C at the heating speed of 100-200 DEG C / h, and presintering is conducted for 1-2 h; and the pre-sintered formed blanks are arranged in a graphite boat at intervals, landfill and compaction are carried out through emery, then the formed blanks are heated to 1400-1450 DEG C, heat preservation is carried out for 2-2.5 h, and sintering and post-treatment are carried out. The method provided by the invention effectively solves the technical problems that an infiltration link is needed in a traditional production mode of the material, the material is not uniform, the mechanical and electrical properties are low, and a complex structure is difficult to directly form.

The invention belongs to the technical field of semiconductors, and discloses a power semiconductor module packaging framework and a design and preparation method thereof. A first copper-clad ceramic substrate; interconnection of the upper surface and the lower surface of the power semiconductor chip is realized through the solder layer; the carbon reinforced metal matrix composite material cushion block is bonded with the upper surface of the chip through the solder layer; a second copper-clad ceramic substrate; a second heat sink base plate; compared with a traditional material, the heat dissipation performance is improved by more than 30%, the heat resistance can be remarkably reduced, and the heat dissipation performance is improved. The thermal expansion coefficients of the diamond / aluminum, the diamond / silver, the graphene / silver and the graphene / copper are better matched with those of the power semiconductor chip, so that the packaging framework can reduce the interface thermal stress by more than 35%, the possibility of interface layering caused by thermal circulation is reduced, and the reliability of the double-sided cooling power semiconductor device is greatly improved. According to the innovative scheme, the problem of heat-force mismatch in traditional double-sided cooling packaging is effectively solved.

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

The invention 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 belongs to the technical field of metal-based composite material additive manufacturing, and particularly relates to ultrasonic-assisted green laser equipment for copper-based diamond cooling fin machining, which comprises a rack, a printing cabin, a green laser machining system, an ultrasonic-assisted system, a powder spreading system, a gas control system, an intelligent control system and an online monitoring system. By integrating a green laser processing system and an ultrasonic auxiliary system, an ultrasonic-green laser-powder multi-energy field coupling processing system is constructed, the wavelength of green laser is 532 nm, the absorption rate of copper is increased, and compared with traditional infrared laser, low-power and high-efficiency melting of copper can be achieved, the diamond graphitization risk is reduced from the angle of a heat source, and the production cost is reduced. Ultrasonic vibration is transmitted to a molten pool through a substrate coupling type structure, by means of the cavitation effect and the acoustic streaming effect, the interface wettability of copper and diamond is effectively improved, the interface bonding force is enhanced, the interface thermal resistance is reduced, meanwhile, grains are refined, pores are eliminated, residual stress is reduced, and the comprehensive performance of the cooling fin is remarkably improved.

The invention belongs to the field of metal-based composite materials and preparation thereof, and provides a preparation method of a nano TiC particle reinforced aluminum-based composite material in order to solve the problem of synergetic improvement of strength, wear resistance and plasticity of the aluminum-based composite material, the preparation method comprises the following steps: mixing nano TiC particles and micron-sized Al powder, and carrying out cold pressing to form a block; an intermediate alloy is obtained through vacuum arc melting and then used in the stirring and casting process of the aluminum-based composite material, and the nano TiC particle reinforced aluminum-based composite material is obtained. According to the nano-particle reinforced aluminum-based composite material and the preparation method thereof, the nano TiC particles are used as a reinforcing phase, the secondary dendritic crystal arm and the grain size are refined by adding the nano TiC particles, and the nano-particle reinforced aluminum-based composite material is prepared by adopting a stirring casting mode, so that the production cost is reduced, and the nano-particle reinforced aluminum-based composite material with uniform distribution of nano-particles in a matrix and excellent comprehensive mechanical properties is prepared; the method has important significance in the fields of automobile industry and aerospace.

A method of preparing a metal matrix composite powder for additive manufacturing, by mixing a metal powder with a ceramic powder, binding the mixed powders together to form an electrode; and using the electrode in an electrode induction gas atomisation (EIGA) process to prepare the metal matrix composite powder. The ceramic can be TiB2, SiC, AlN or a MAX-phase ceramic, the latter having the formula Mn+1AXn where M is a metal, A is an A-group element and X is C, N and / or B, e.g. Ti3SiC2, Al4SiC4 or Al8SiC7. The metal powder can be steel (e.g. stainless steel), titanium, aluminium, cobalt, magnesium, copper, refractory metals, PGMs vanadium and alloys thereof (e.g. 6061 aluminium). Binding to form the electrode can be by cold isostatic pressing, sintering and / or the application of pressure. The powder can be processed by laser powder bed fusion AM or direct energy deposition printing.

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

The invention provides a structured modeling and intelligent sorting decision-making method and device for feeding and discharging visual detection data of a metal-based composite material, and is applied to the technical field of data processing. The full-process technical system of data acquisition, threshold setting, processing modeling, strategy making and transmission execution is constructed according to the feeding and discharging sorting requirements of the metal-based composite material. The method comprises the following steps: firstly, collecting visual detection core data and working condition associated data, and setting a multi-dimensional threshold according to sorting precision, defect detection sensitivity and production efficiency; generating a standardized data set through data noise reduction, calibration, alignment and feature extraction, and sorting the standardized data set; determining a sorting decision strategy in combination with characteristics such as material specifications and computing power resources, and matching a sensor acquisition frequency; and after the data set is divided into control batches for ordered transmission, executing parameters are optimized through a multi-modal feature fusion algorithm, equipment and scenes are dynamically adapted, and finally accurate sorting control signals are generated, so that efficient and accurate sorting is realized.

The invention discloses a three-dimensional graphene copper composite material based on in-situ interface chemical bonding and a preparation method and application of the three-dimensional graphene copper composite material, relates to the technical field of metal-based composite materials, and solves the problems of graphene dispersion and interface bonding. The preparation method of the three-dimensional graphene copper composite material comprises the following steps: dissolving soluble copper salt and an organic ligand in water to form a complex solution, adding copper powder into the complex solution, uniformly mixing, and drying to obtain precursor coated copper powder; and carrying out spark plasma sintering or vacuum hot pressed sintering on the precursor coated copper powder to obtain the copper powder. A three-dimensional interpenetrating continuous network formed by graphene is arranged in the prepared three-dimensional graphene copper composite material, the interface of the graphene and a copper matrix is a chemical bonding interface, the comprehensive performance is excellent, and the composite material has high conductivity (gt; 103% IACS) and a high strength (gt; the comprehensive performance of the composite material is far better than that of a composite material prepared by a traditional method, and the composite material is suitable for high-end electric conduction, heat conduction and structural function integrated components.

The invention discloses a ceramic reinforced metal matrix composite gradient wear-resistant coating for a mine claw, which is characterized in that the coating comprises a first transition coating, a second transition coating and a third functional coating from inside to outside from a matrix, wherein the first transition coating is composed of the following components in percentage by volume: 20% of TiC ceramic particles and 80% of 316L stainless steel powder; the second transition coating is composed of, by volume, 30% of TiC ceramic particles and 70% of 316L stainless steel powder. The third functional coating is composed of, by volume, 50% of TiC ceramic powder and 50% of 316L stainless steel powder. The coating has the advantages of high hardness, high wear resistance and the like, has strong bonding property with a mine claw base material, and can effectively protect the surface of the claw and prolong the service life of the claw. The optimal process parameters of each gradient coating are researched, and the cladding parameters are accurately regulated and controlled, so that the defects between layers are reduced, and the hardness and wear resistance of each gradient cladding coating are improved.

The invention discloses a block magnesium-based composite material capable of quantitatively regulating and controlling the content of nano-particles and a manufacturing method of the block magnesium-based composite material, and belongs to the technical field of metal-based composite material preparation. The method comprises the following steps: providing a magnesium alloy substrate and a cover plate, determining the sectional dimension of a groove of the cover plate according to the volume fraction of target nanoparticles, processing the groove, then filling the groove with the nanoparticles, assembling the cover plate on the substrate in an inverted buckling manner to form a to-be-processed assembly, performing multi-pass stirring friction processing to form a first composite material layer, and stacking the first composite material layer as a new substrate layer by layer to form a second composite material layer; and finally, the target block magnesium-based composite material is prepared. Through the correlation design of the groove size and the target volume fraction, accurate control and uniform dispersion of the nano-particle content are achieved, the problems that a traditional method is high in defect rate, limited in size and the like are solved, the strength and plasticity of the prepared material are remarkably improved, the process is green and environmentally friendly, and the method is suitable for mass production of large-size components and can be popularized to various light metal matrixes; the application prospect is wide.

The invention belongs to the technical field of metal-based composite materials and powder metallurgy, and particularly relates to a micro-nano hybrid ceramic particle and graphene reinforced aluminum-based composite material and a preparation method thereof.The micro-nano hybrid ceramic particle and graphene reinforced aluminum-based composite material comprises an aluminum alloy matrix and a reinforced phase evenly dispersed and distributed in the aluminum alloy matrix; the aluminum alloy matrix is an Al-Cu-Mg-Si alloy, and the reinforcing phase comprises micron-scale ceramic particles, nano-scale ceramic particles and graphene. The prepared micro-nano hybrid ceramic particle and graphene reinforced aluminum matrix composite comprises an aluminum alloy matrix, and micron-scale ceramic particles, nano-scale ceramic particles and graphene which are uniformly dispersed and distributed in the aluminum alloy matrix, the micro-nano hybrid ceramic particle and graphene reinforced aluminum-based composite material has the advantages of high strength, high rigidity, good plasticity, low density and the like.