828 results about "Metal matrix composite" patented technology

The invention belongs to the technical field of laser processing, and particularly relates to a multi-mode laser coupling high-efficiency and high-quality additive manufacturing method for a metal-based composite material, which comprises the steps of pretreatment, substrate pretreatment, multi-mode coupling laser construction, additive manufacturing and the like. High-power pulse laser is adopted as energy supply main laser to melt the metal matrix composite wire, meanwhile, flowing of a molten pool is accelerated, the nucleation rate is increased, and metal matrix composite parts are machined through the additive manufacturing method. The continuous laser is adopted to effectively slow down the cooling speed of the molten pool, and the residual tensile stress generated in the component due to rapid solidification of the molten pool is greatly reduced. Oscillating laser is adopted to improve the shape of a molten pool and reduce the number of times of transverse lap joint. According to the method, multi-mode laser coupling and cooperation with the flat-topped laser light source are utilized, and the metal-based composite material machining part with the uniform and flat surface appearance macroscopically and the stable and uniform organization structure microcosmically is obtained.

This application relates to a test device applied to a coupled environment of stress, wear, and corrosion, and a quantitative evaluation method, and belongs to the field of failure analysis of materials. The test device includes a stress-loading mechanism configured to load a stress on a sample, a corrosion mechanism configured to conduct an electrochemical corrosion test on the sample, and a wear mechanism configured to wear a sample. The test device applied to a coupled environment of stress, wear, and corrosion of this application can establish a wear-stress-corrosion coupled action test process, and can investigate service behaviors of various metallic materials and metal matrix composites under conditions close to actual service conditions to obtain key behavior data under a multi-factor coupled action, quantitatively analyze a wear, a corrosion, a wear-corrosion interaction, a stress-wear interaction.

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 relates to a preparation method of a carbon fiber reinforced metal matrix composite brake disc, and belongs to the technical field of brake disc preparation. Immersing the carbon fiber in an ethanol solution containing a silane coupling agent, and drying; the aluminum-based alloy powder, the copper-based alloy powder and the silicon carbide particles are put into a planetary ball mill to be subjected to ball milling, and metal matrix mixed powder is obtained; the pretreated carbon fibers are woven into a three-dimensional woven prefabricated body, then pores of the prefabricated body are evenly filled with metal matrix mixed powder, cold press molding is conducted, and a composite material prefabricated body is obtained; putting the composite material prefabricated body into a vacuum hot-pressing sintering furnace, and sintering to form a carbon fiber reinforced metal matrix composite material brake disc blank; after solution treatment, adding a rare earth coordination type enhancer and carrying out aging treatment; the carbon fiber reinforced metal matrix composite brake disc prepared by the method has excellent wear resistance and mechanical properties, and can meet the use requirements of modern high-performance vehicles on brake discs.

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 method for manufacturing a functionally graded composite material through wire powder composite arc additive manufacturing, which comprises the following steps: firstly, carrying out surface treatment on a base material, enabling the surface of titanium alloy to expose fresh white bright metal luster by adopting a machining mode, and removing surface oil stains by using alcohol and acetone; according to the requirement of materials for the gas atmosphere in the additive manufacturing process, the flexible inert gas cabin is filled with appropriate gas, and the gas atmosphere is kept all the time in the additive manufacturing process. On the basis of the electric arc additive manufacturing technology, electric arc additive manufacturing of the functional gradient metal-based composite material is achieved through a wire powder composite device, and the key technology is that according to different position requirements of parts, the metal-based composite materials with different ceramic particle contents are manufactured in an additive mode; a gradient transition area is manufactured between two areas with large particle content difference, and large stress generated at an interface due to component mutation is reduced.

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.

To provide a method for manufacturing a ceramic susceptor, capable of improving bonding force between the upper and lower plates of a MMC (a Metal Matric Composite) metal ceramic composite base body, and the ceramic susceptor.SOLUTION: A ceramic susceptor base body includes a body obtained by bonding lower and upper plates 210 and 220 consisting of a metal ceramic composite, respectively. A method for manufacturing the aceramic susceptor base body comprises steps of: successively laminating a first active metal layer 321, a first aluminum layer 322 and a blazing filler layer 323 on the bonded surface of the upper plate; successively laminating a second active metal layer 311 and a second aluminum layer 312 on the bonded surface of the lower plate; and brazing and bonding the lower and upper plates by the brazing filler layer.SELECTED DRAWING: Figure 2C

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 invention relates to the technical field of metal-based composite materials, and discloses a preparation method of a silicon carbide reinforced aluminum-based composite material for electronic packaging, the method that pre-oxidation is conducted on the surfaces of silicon carbide particles first and then vacuum micro-evaporation titanium plating is conducted is adopted, the wettability with an Al matrix is obviously improved, generation of an interface reaction brittle product Al4C3 is inhibited, and the performance of the silicon carbide reinforced aluminum-based composite material is improved. Defects such as gaps in the composite material are reduced, and the mechanical property of the composite material is improved; the silicon carbide reinforced aluminum-based composite material is prepared by adopting a non-pressure infiltration method, so that the production time is obviously shortened, infiltration can be successful by taking a small amount of time, and the process is stable; the interface phase TiC / Ti5Si3-Al coating not only improves the electrical conductivity and thermal conductivity of the silicon carbide powder, but also enhances the adhesive force of the silicon carbide powder and an aluminum base; al2O3 is gradually adsorbed and deposited on the surface of the material by adopting a micro-arc oxidation process, so that the corrosion resistance of the aluminum silicon carbide composite material is enhanced, and the requirements of a contemporary packaging material on high heat dissipation and corrosion resistance can be met.

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 discloses a laser additive manufacturing method of a graphene reinforced metal matrix composite material. The method comprises the following steps: 1, preparing mixed powder of graphene and metal powder by adopting a method of combining ultrasonic and mechanical stirring; secondly, the mixed powder is subjected to preliminary melting through the preliminary melting process parameters, and a preliminary solidification deposition layer is obtained; 3, remelting the preliminary solidification deposition layer by using remelting process parameters to obtain a remelted solidification deposition layer; and fourthly, the second step and the third step are repeated layer by layer, and finally the laser additive manufacturing graphene reinforced metal matrix composite is obtained. According to the method, the mixing uniformity and stability of graphene and metal powder are improved through the ultrasonic and mechanical stirring combined method, graphene agglomeration is avoided, uniform distribution of graphene is promoted through the remelting process, the defect of poor fusion is effectively eliminated, a high-density formed part is obtained, and the product quality is improved. And synchronous improvement of heat conduction and mechanical properties of the laser additive manufacturing graphene reinforced metal matrix composite material is realized.

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 includes a method for producing a metal matrix composite powder, in which a metal matrix composite material is produced by introducing ceramic particles into a molten metal matrix and stirring, and a semi-finished product in the form of a melt is formed, which is then atomized or sprayed, wherein the metal matrix composite material is placed in a fluid state into a container or melted in a container in which it remains for a residence time until a molding mass or a molded body with a lower and an upper region is formed therein, wherein the lower region has a different proportion of ceramic particles than the upper region due to gravity and / or due to an electromagnetic field applied to or around the container, and wherein either the lower or the upper region has a ceramic particle content of at least 30 wt.-%, and subsequently the upper area is separated from the lower area, wherein the area which has a ceramic particle content of at least 30 wt.% forms the semi-finished product or is formed or primed into the semi-finished product.

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 provides a high-strength steel wire rope. The high-strength steel wire rope comprises a steel wire rope body, an externally-attached active regulation and control device and a regulation and control sleeve. The steel wire rope body comprises an outer layer, a middle layer and a core part which are sequentially arranged from outside to inside, the outer layer is a six-strand steel wire bundle with a hexagonal section, the six-strand steel wire bundle is divided into two and three strands which are spirally twisted in a leftward constant-pitch mode to form an alternate close-packed structure, the middle layer is twelve corrugated steel wire strands with a rhombic section, and the core part is arranged between the twelve corrugated steel wire strands. The twelve corrugated steel wire strands are spirally twisted rightwards in a variable-pitch mode, the wave crests and the wave troughs of the twisted adjacent strands are arranged in a staggered and meshed mode to form a continuous contact face, and the core part is a carbon fiber reinforced metal matrix composite core; the active regulation and control device comprises a memory alloy framework layer, a gradient elastic buffer layer and a connecting interface which are sequentially arranged from outside to inside, and the connecting interface is a hexagonal groove array forming geometric interlocking with the six strands of steel wire bundles.

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 discloses Al-Si-Ti system spherical composite powder for additive manufacturing and a preparation method and application of the Al-Si-Ti system spherical composite powder, and belongs to the technical field of metal-based composite materials for additive manufacturing. The composite powder is prepared from the following raw material components in percentage by mass: 81.8 to 94.2 weight percent of aluminum, 5.3 to 15.83 weight percent of silicon, 0.5 to 6.25 weight percent of titanium, 0.8 to 10 weight percent of Ti5Si3 generated by in-situ reaction in the composite powder, and 5 to 15 weight percent of residual Si. The prepared composite powder is high in sphericity degree and low in impurity content, in-situ synthesized Ti5Si3 reinforced phase particles are evenly distributed in an alloy matrix in a nanoscale mode, the content is controllable, and eutectic Si is small in size. The invention further discloses a preparation method of the composite powder, through preparation of the Al-Si-Ti system spherical composite powder containing fine Ti5Si3 reinforced phase particles, the problems that in a traditional powder mixing process, powder mixing is not uniform, Ti reaction is incomplete, and the sphericity degree of the powder is reduced are effectively solved; and ideal raw material powder is provided for additive manufacturing of the high-performance Al-Si-Ti composite material.

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 invention discloses a preparation method for in-situ generation of an Al3Fe nanoparticle reinforced aluminum-based composite material, and belongs to the technical field of metal-based composite material preparation. Comprising the following steps that (1) mixed powder is prepared, and the mixed powder is weighed according to the mass percent of 3%-13% of nano carbon-coated iron powder and the balance pure Al; (2) carrying out ball-milling treatment on the mixed powder, loading the mixed powder into a ball-milling tank, and carrying out ball-milling treatment on the mixed powder in an argon environment; (3) sintering and molding; (4) carrying out hot extrusion on the sintered composite material block; the tensile strength of the high-volume-fraction in-situ generated Al3Fe nano-particle reinforced aluminum-based composite material at room temperature reaches 473.76 MPa, the hardness reaches 175.47 HV, the tensile strength at high temperature can reach 204.63 MPa, and the high-volume-fraction in-situ generated Al3Fe nano-particle reinforced aluminum-based composite material has the advantages of being high in strength, resistant to abrasion, low in thermal expansion coefficient, excellent in heat-conducting property and the like.

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.

The invention belongs to the technical field of metal-based composite materials, and discloses a double-metal composite material with a spiral layered structure and a preparation method thereof.The double-metal composite material with the spiral layered structure comprises framework metal and filling metal, the framework metal is of a spiral layered structure, and the spiral angle between every two adjacent layers is 30 degrees or 60 degrees or 90 degrees; the filling metal is filled in the gap of the framework metal; the volume fraction of the framework metal is 15%-75%, and the rest space is filled with the filling metal; the melting point of the framework metal is higher than that of the filling metal. According to the preparation method disclosed by the invention, the microstructure and the macroscopic form of the bimetallic composite material can be flexibly regulated and controlled, and the design and construction of a complex macro-microstructure are realized; the obtained double-metal composite material with the spiral layered structure is excellent in compressive strength, elastic modulus, corrosion resistance and the like.

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.