805 results about "Aluminum matrix composites" patented technology

The invention discloses a gradually-changed Si-Al alloy coating diamond / aluminum-based composite material and a preparation method and application thereof, and the gradually-changed Si-Al alloy coating diamond / aluminum-based composite material is composed of an aluminum matrix and modified diamond evenly dispersed in the aluminum matrix. The modified diamond comprises diamond particles and a gradually-changed Si-Al alloy coating wrapping the surfaces of the diamond particles, in the gradually-changed Si-Al alloy coating, the mass fraction of Si is linearly decreased from 100% to 0% from inside to outside, and the mass fraction of Al is linearly increased from 0% to 100% from 0%. According to the method, the Si-Al alloy coating with gradually-changed and controllable components is constructed on the surface of the diamond, so that a SiC transition layer with strong binding force can be formed with the diamond, the gradient gradient coating is formed from inside to outside, internal stress can be released, good metallurgical bonding with an aluminum matrix can be achieved, formation of an Al4C3 phase is inhibited, and therefore the performance of the composite material is remarkably improved.

The invention discloses a nano-copper modified reduced graphene oxide powder preparation method, which comprises: S1, uniformly mixing a reduced graphene oxide dispersion liquid and a copper chloride solution to obtain a mixed liquid A; s2, reducing the mixed solution A by adopting a reducing agent to obtain a mixed solution B; s3, adjusting the pH value of the mixed solution B to 8-9 to obtain a mixed solution C; s4, titrating the mixed solution C with an alkaline solution until the mixed solution C is red, and standing and filtering to obtain a precipitate D; s5, washing the precipitate D until the pH value of supernatant liquid is neutral, and drying to obtain a precipitate E; and S6, sintering the precipitate E in an inert atmosphere to obtain the nano-copper modified reduced graphene oxide powder. The invention further discloses the nano-copper modified reduced graphene oxide powder, the high-strength and high-conductivity graphene copper plating-aluminum matrix composite and a preparation method of the high-strength and high-conductivity graphene copper plating-aluminum matrix composite.

The invention relates to an aluminum-based composite material, in particular to a preparation method of an in-situ micro-nano Al2O3 particle reinforced aluminum-based composite material. The preparation method comprises the following steps: carrying out ball-milling pre-dispersion on silica powder, calcined kaolin and aluminum powder according to a specified ratio, stirring an Al-Si alloy melt at a semi-solid temperature, adding ball-milling mixed powder, heating to a temperature above an Al-Si alloy liquidus, dispersing reactant powder by using a blade-tray integrated stirring device, heating, carrying out heat preservation, carrying out heat preservation, and carrying out vacuum drying to obtain the aluminum-silicon alloy. And reacting to generate in-situ micro-nano Al2O3 particles, cooling, supplementing alloy elements, refining, and pouring to obtain the in-situ micro-nano Al2O3 particle reinforced composite material. According to the blade-tray integrated stirring device, mechanical stirring and the rolling and impacting effects of the ceramic balls are combined, the problem of one-time dispersion of micro-nano reactant powder is effectively solved, meanwhile, passivation of edges and corners of micron particles is achieved, and the comprehensive performance of in-situ particle reinforced aluminum matrix composites is improved.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention discloses an aluminum-based composite material powder continuous forming press with an automatic powder feeding function, and relates to the technical field of powder type presses, the aluminum-based composite material powder continuous forming press comprises a main base, a pressing die is fixedly installed in the main base, and a stamping head driven by a stamping mechanism is further arranged on the main base; a material mixing mechanism used for mixing powder in the pressing mold is arranged in the main base, a demolding mechanism used for demolding is arranged in the pressing mold, a powder feeding mechanism and a discharging mechanism which are used for feeding powder and discharging are further arranged on the main base, the material mixing mechanism comprises a guide table, and a guide sliding block driven by a lifting driving part is slidably connected into the guide table; during use, through the linkage design of the lifting sliding seat, the connecting rod, the guide sliding blocks and the spherical hammer rods in the material mixing mechanism, the spherical hammer rods knock and mix powder in a mold, the powder fluidity is remarkably improved, it is guaranteed that the powder is evenly distributed in the mold, and the pressing quality is guaranteed.

The invention discloses a TiB2 / TiC reinforced high-silicon heat-resistant aluminum-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite materials. Aluminum powder, titanium powder and metal oxide powder are mixed and then centrifugally sprayed to be prepared into small balls; mixing the small balls with aluminum powder, boron oxide powder and carbon powder, and pressing into a prefabricated body; smelting the intermediate alloy A, adding the preform and a covering agent for heat preservation, cooling, adding the intermediate alloy B, and stirring to obtain a mixed melt; and degassing and removing impurities from the mixed melt, refining and slagging, and then pouring to obtain the TiB2 / TiC reinforced high-silicon heat-resistant aluminum-based composite material. According to the preparation method, the TiB2 / TiC reinforced phase is generated in situ in the aluminum substrate through two-stage reaction, the reinforced micro-nano TiC and TiB2 ceramic particles are high in bonding capacity with a metal-based interface, a transition interface is free of impurities, and the mechanical property of the material is greatly improved. And the ceramic particles produced by the preparation method have the advantages of good dispersion degree in the matrix, less agglomeration, faster reaction process, fast particle generation speed and no generation of harmful gas.

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 discloses a high-strength, high-conductivity and heat-resistant aluminum-based composite material. The aluminum-based composite material is formed by compounding and sintering 90-95 wt% of an aluminum alloy matrix and 5-10 wt% of a conductive fiber membrane. A trace amount of Zr, Hf and B elements are added into the aluminum alloy matrix, and the effects of refining grains, purifying impurities and improving the electric conductivity, heat resistance and comprehensive mechanical performance of the alloy matrix can be achieved. The conductive fiber membrane is a polyaniline / polyacrylonitrile composite conductive fiber membrane doped with nano-copper particles and cerium oxide particles, and polyaniline and polyacrylonitrile blended spinning can improve the strength and stability of the fiber membrane. And the conductivity of the fiber membrane and the bonding strength of the fiber membrane and an aluminum alloy matrix can be further improved through doping of the nano-copper particles and the cerium oxide particles. The aluminum-based composite material disclosed by the invention has good electrical conductivity and heat resistance and excellent comprehensive mechanical properties.

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 discloses a multi-scale hybrid particle reinforced aluminum-based composite material, which is prepared from the following raw material powder in percentage by mass: 70 to 98.5 percent of AlSi10Mg atomized powder, 0.5 to 20 percent of micron-sized Al2O3 powder, 0.5 to 20 percent of nano-sized Al2O3 powder and 0.5 to 20 percent of submicron-sized SiC powder, and the sum of the mass percent of the components is 100 percent. The material is an aluminum-based composite material with high strength, high toughness and high hardness. The invention further provides an SLM preparation method of the multi-scale hybrid particle reinforced aluminum-based composite material, through particle content optimization, powder preparation process innovation and SLM process parameter optimization, the high-strength, high-toughness and high-hardness aluminum-based composite material is obtained, and additive manufacturing of the aluminum-based composite material is achieved.

The invention relates to the technical field of aluminum-based composite materials, in particular to an intelligent temperature control self-repairing aluminum-based composite material and a preparation method of the intelligent temperature control self-repairing aluminum-based composite material. 5-15 parts of shape memory alloy microwires; 4.3 to 11.8 parts of epoxy resin prepreg containing microcapsules; wherein the epoxy resin prepreg containing microcapsules is composed of the following components: 3-8 parts of epoxy resin; 0.3 to 0.8 part of a curing agent; according to the invention, the advantages of a metal material, a composite material and an intelligent material are ingeniously combined. The aluminum alloy matrix provides excellent specific strength and specific stiffness, the shape memory alloy microwires endow the material with intelligent response capability, and the microcapsule system realizes a chemical repair function.

The invention relates to the technical field of metal materials, and particularly provides a rare earth modified in-situ reinforced particle reinforced aluminum-based composite material and a preparation method thereof.The preparation method of the rare earth modified in-situ reinforced particle reinforced aluminum-based composite material comprises the steps that reactants and rare earth oxide are mixed, pressed into blocks and dried, and reactant blocks are obtained; the reactant blocks are added into the aluminum alloy melt for a high-temperature self-propagating reaction, in-situ reinforced particles are generated, and particle reinforced aluminum matrix composite melt is obtained; and degassing the particle reinforced aluminum matrix composite melt, and preparing the rare earth modified in-situ reinforced particle reinforced aluminum matrix composite by adopting a near liquidus casting method. According to the preparation method, micron-sized reinforced phase particles are generated in situ under the conventional casting condition by utilizing the high-temperature self-propagating reaction of a reaction system and the activity effect of rare earth elements, and the aluminum-based composite material with the fine equiaxed crystal structure is prepared.

The invention discloses a silicon carbide / silicon dioxide hybrid reinforced aluminum-based composite material and a preparation method thereof.The performance of the silicon carbide reinforced aluminum-based composite material is improved through low-density and low-expansion-coefficient silicon dioxide, and the wettability of silicon carbide and an aluminum alloy matrix can be improved by adding the silicon dioxide; and the thermal expansion coefficient of the aluminum-based composite material can be further reduced. According to the method, the aluminum alloy powder is obtained by adopting an aerosol method, and the high-energy ball milling method and the hot isostatic pressing sintering process are combined, so that the composite powder is formed under uniform pressure and lower temperature, an AlC3 brittle phase generated by harmful interface reaction is avoided, the compactness of the aluminum-based composite material can be greatly improved, and the service life of the aluminum-based composite material is prolonged. The problems that an aluminum alloy matrix containing silicon carbide reinforced particles is poor in wettability and poor in size stability under the condition that the temperature changes drastically are solved.

The invention discloses a ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material and a laser additive manufacturing method thereof. Firstly, ceramic / high-entropy alloy composite powder and aluminum alloy powder are mixed through ball milling to obtain ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder, then the composite powder of the three components is laid on a powder bed, laser power, scanning speed, scanning spacing and the like are adjusted, and laser scanning melting solidification is conducted to prepare the ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder. And the ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material is formed. The composite material disclosed by the invention is highly compact, so that the ceramic / high-entropy alloy composite particles can effectively improve the mechanical property of the aluminum-based composite material, and can be used for manufacturing high-performance complex parts for aerospace, automobile rail transit and the like.

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 invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

The invention provides a preparation method and application of a foamy copper reinforced aluminum-based composite material, and belongs to the technical field of aluminum-based composite material preparation. According to the foamy copper reinforced aluminum-based composite material, a variable-frequency and variable-power ultrasonic vibration assisted centrifugal casting technology is adopted, strong centrifugal force and the ultrasonic cavitation effect are utilized, so that the biological flowability of aluminum water is improved, the wettability between aluminum and copper is improved, and in combination with the effects of an auxiliary agent and Zn-Al or Sn-Al intermediate alloy, the foamy copper reinforced aluminum-based composite material is obtained. The problem that the binding force of foamy copper and an aluminum matrix is poor is solved, the adopted ultrasonic power is low (smaller than or equal to 1000 W), the preparation technology is simple, the obtained foamy copper reinforced aluminum matrix composite is free of obvious cracks and holes and high in density and thermal diffusion coefficient, and a light intelligent thermal management material can be provided for the field of electronic equipment.

The invention discloses an aluminum-based composite material, a preparation method thereof and an electronic device, and belongs to the field of electrical materials. The preparation method comprises the following steps: purifying the aluminum-based base material to obtain the purified aluminum-based base material. A metal protection layer is formed on the surface of the purified aluminum-based base material, and a first composite material intermediate is obtained; performing first electroplating treatment on the first composite material intermediate to corrode the metal protective layer so as to form a first metal coating on the surface of the aluminum-based substrate, thereby obtaining a second composite material intermediate; and the second composite material intermediate is subjected to second electroplating treatment, so that a second metal coating is formed on the surface of the first metal coating, and the aluminum-based composite material is obtained. According to the preparation method, the compactness and smoothness of the plating layer can be improved, other inert precious metals do not need to be introduced in the preparation process, and the preparation method has the advantages of being short in operation process, convenient, efficient, high in reliability, low in cost and the like.

The invention discloses a heat-resistant aluminum-based composite material and a selective laser melting forming preparation method and application thereof, and belongs to the technical field of metal material additive manufacturing. According to the method, aluminum-silicon alloy matrix powder and nano CuO powder are mixed to serve as cladding powder, Al2O3 and Al2Cu nano particles and precipitated phases which are evenly distributed are directly generated in matrix alloy through in-situ reaction of Al-CuO in a selective laser melting process under the action of high-energy laser, and an aluminum-silicon eutectic structure can be refined to 200-300 nm. Cooperative strengthening of multiple precipitated phases and multiple interfaces is achieved, and the problems of coarse precipitated phases, unmelted particles and the like generated by traditional alloying methods and the like are solved. According to the method, the high-temperature mechanical property of the selective laser melting forming aluminum-based composite material can be remarkably improved. The prepared composite material is suitable for high-temperature light-weight components such as aerospace and nuclear energy equipment, and has a wide application prospect.

The invention discloses an aluminum-based composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing powder of an intermediate alloy, a simple substance metal and a reinforcement with a binder, and carrying out cold pressing to form a green body; degreasing and sintering the green body to obtain a sintered part; and heating the sintered part, performing closed die forging, performing heat treatment and fine trimming to obtain a finished product, and if the performance does not meet the requirements, performing hot extrusion on the sintered part, and performing heat treatment and fine trimming to obtain the finished product. Oxide is removed through ball milling, the surface of the Al-Mg powder is activated, and passivation is protected through a binder; a reinforced phase SiC is designed to be blended with a binder, and then the mixture is mixed with other powder to form a specific microstructure; low-melting-point Sn is introduced to limit the sintering temperature, element diffusion is promoted through a liquid phase, and generation of a harmful intermediate phase is avoided; a sintered part with the density being 80-95% is adopted, a low-strain soft area is formed around a reinforced phase in cooperation with a specific microstructure, deformation coordination is improved, meanwhile, the peak aging time of the aluminum alloy is prolonged through SiC, the electric conduction and heat conduction performance is improved, and the comprehensive performance of the composite material is comprehensively improved.

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 application relates to the technical field of metal casting, and discloses a directional solidification casting equipment for low-internal-stress aluminum alloy complex structures, which comprises a heat preservation furnace, a rotary casting assembly, an infiltration temperature control assembly and a forming die. The casting equipment is provided with the rotary casting assembly and the forming die on a rotary table, the rotary table rotates at different rotating speeds to provide controllable centrifugal force, metal liquid is infiltrated and cast on the forming die in the anti-gravity mode under the action of the centrifugal force, the infiltration speed and pressure can be adjusted by changing the centrifugal force, the limitation of workpiece size in negative pressure casting is broken, and the anti-gravity casting of complex structure workpieces is facilitated, the equipment can simultaneously synchronously cast multiple molds, each process parameter is convenient to uniformly control, the quality consistency is ensured, the problem that continuous carbon fiber reinforced aluminum matrix composite materials are difficult to mass produce is solved, and the production efficiency is improved.

The invention belongs to the technical field of preparation of aluminum-based composite materials, and particularly relates to a preparation method of a reinforced aluminum-based composite material through vacuum reciprocating smelting assisted thin-strip cast rolling. Comprising the steps of aluminum matrix material preparation, ceramic / aluminum matrix composite powder vacuum ball milling, aluminum matrix and ceramic / aluminum matrix composite powder vacuum reciprocating smelting, thin strip cast rolling, cast strip primary treatment, cast strip heat treatment, hot rolling, cold rolling, performance optimization and the like. An aluminum alloy matrix bar with specific components is selected, ceramic particle / aluminum matrix composite powder with the mass fraction of 5%-25% is prepared through vacuum ball milling, it is ensured that aluminum powder is completely attached to the surfaces of ceramic particles, and good wetting of the particles and an aluminum matrix is achieved. And then thin strip cast rolling, heat treatment, hot rolling, cold rolling and other treatments are carried out. And finally, the ceramic / aluminum-based composite material with the ceramic particles uniformly distributed on the matrix is prepared, and the ceramic / aluminum-based composite material shows excellent tensile strength, elongation and wear resistance and has no grain boundary segregation phenomenon.

The invention relates to a carbon nanotube reinforced aluminum-based composite material part and an additive preparation method thereof, and belongs to the technical field of additive manufacturing. The additive preparation method comprises the following steps that Al-Cu-Mg series aluminum alloy powder and carbon nano tube powder are subjected to ball milling treatment, and composite powder is obtained; the composite powder is subjected to forming treatment and processing treatment, and a raw material piece is obtained; the raw material part is subjected to friction extrusion deposition treatment, and an additive part is obtained; wherein the parameters of the friction extrusion deposition treatment are controlled as follows: r2. C = (8-12). V.t; wherein t is the thickness of a single layer in the additive layer, c is the feeding rate of the raw material piece, v is the additive advancing rate, and r is the radius of the raw material piece; and the additive part is subjected to heat treatment, and the carbon nano tube reinforced aluminum matrix composite part is obtained. The method is mainly used for solving the problem that the high-strength carbon nano tube reinforced aluminum-based composite material is difficult to form when the carbon nano tube reinforced aluminum-based composite material part is prepared by friction extrusion deposition additive materials.

The invention provides a preparation method of a high-thermal-conductivity silicon carbide particle reinforced aluminum-based composite material. The preparation method comprises the following steps: step 1, shaping silicon carbide particles; step 2, mechanical mixing; step 3, packaging; step 4, carrying out vacuum hot degassing; and fifthly, hot isostatic pressing treatment is conducted, specifically, the ingot blank is put into a hot isostatic pressing machine to be subjected to hot isostatic pressing, then an aluminum sheath of the ingot blank is removed through machining, and the high-thermal-conductivity silicon carbide particle reinforced aluminum-based composite material is obtained. According to the preparation method of the high-thermal-conductivity silicon carbide particle reinforced aluminum-based composite material, the preparation process of the high-thermal-conductivity aluminum-based composite material can be optimized, the specific surface area of particles is reduced, the bonding interface area of the composite material is reduced, and the thermal resistance of the composite material is reduced; the heat-conducting property of the composite material is improved; and the stress around the silicon carbide particles can be more uniform, and the mechanical property is better.

The invention belongs to the technical field of composite material casting, and particularly relates to an aluminum-based composite material casting and a casting method and device thereof. Molding equipment in the casting device of the aluminum matrix composite casting comprises a mold and a sand core arranged in a mold cavity of the mold, the sand core divides the mold cavity into a first cavity and a second cavity, and at least one pouring gate communicating with the first cavity and the second cavity is arranged on the sand core; the pouring gate is configured to be used for cooling the aluminum-based composite material melt into semi-solid slurry; the smelting equipment is communicated with the first cavity through a liquid rising pipe, and the pressure regulation and control system is used for regulating and controlling the internal pressure of the forming equipment and the smelting equipment, so that an aluminum-based composite material melt in the smelting equipment is injected into the first cavity through the liquid rising pipe and passes through the pouring gate to form semi-solid slurry, and the semi-solid slurry is rapidly filled into the second cavity. By means of the casting device, casting of the aluminum-based composite material casting which is full in mold filling, high in compactness, fine in working face structure and uniform in reinforced phase distribution is achieved.

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 provides a low-density high-strength aluminum-based composite material and a preparation method, and relates to the technical field of aluminum alloy powder metallurgy preparation. The composite material is composed of two parts: a matrix alloy and hollow glass beads, wherein the addition amount of the hollow glass beads is 5-30 wt.%. The matrix alloy comprises the following components in percentage by mass: 0 to 6.0 percent of Cu, 0 to 3.0 percent of Mg, 0 to 8.4 percent of Zn and the balance of Al and inevitable impurities; the hollow glass beads are prepared from the following components in percentage by mass: 70 to 80 percent of SiO2, 8 to 15 percent of CaO, 5 to 15 percent of Na2O, 3 to 8 percent of B2O3 and 2 to 3 percent of Al2O3. The composite material is prepared through surface modification of hollow glass beads, preparation of composite powder, preparation of a composite material green body, sintering densification, deformation processing and heat treatment. According to the technology, low-cost preparation and processing of the low-density and high-strength aluminum-based composite material can be achieved, the technological process is simple, the production efficiency is high, the method is suitable for large-scale industrial production, and the application prospects in the fields of aerospace, new energy automobiles, ships, electronic communication and the like are huge.

The invention provides a welding method of an aluminum-based composite material and an aluminum-based composite material joint, and relates to the technical field of welding, the welding method comprises the following steps: plating a metal layer on a to-be-welded surface of the aluminum-based composite material to obtain a to-be-welded part; wherein the aluminum-based composite material comprises an aluminum matrix and a ceramic reinforced phase, the metal layer is used for forming an eutectic phase with the aluminum matrix, and the melting point of the eutectic phase is 440 DEG C or below; the two to-be-welded parts are assembled, so that the metal layers of the two to-be-welded parts are attached, and an assembly part is obtained; under the vacuum condition, preset pressure is applied to the assembly part, the assembly part is heated to the welding temperature under the action of pulse current, heat preservation is conducted for preset time, the assembly part is cooled to the room temperature, and the aluminum-based composite material connector is obtained; wherein the direction of the pulse current is perpendicular to the to-be-welded surface of the aluminum-based composite material. By adopting the method disclosed by the invention, the aluminum-based composite material joint with relatively high strength and relatively low deformation rate can be obtained.

The invention discloses a preparation method of a high-volume-fraction multi-scale silicon carbide reinforced aluminum-based composite material with a self-lubricating function, and relates to a preparation method of a silicon carbide reinforced aluminum-based composite material. The problem that the strength and rigidity are low due to the fact that the content of solid lubricating materials in aluminum-based self-lubricating materials is high is solved. The preparation method comprises the following steps: mixing the silicon carbide particles and the carbon nanotubes, putting into a mold, compacting by vibration, and performing cold pressing to obtain a blank; smelting the matrix metal ingot to obtain molten aluminum; the molten aluminum is transferred into a mold containing the prefabricated body to be subjected to pressure infiltration, and the high-volume-fraction multi-scale silicon carbide reinforced aluminum matrix composite with the self-lubricating function is obtained; by adding the high-rigidity carbon nanotubes, the rigidity and strength of the material can be remarkably improved, and the composite material has a good self-lubricating effect. The micron-sized silicon carbide and the nano-sized carbon nanotubes are adopted to play a synergistic effect of different scales, so that the strength and the rigidity of the material are effectively improved, and the material has relatively high comprehensive performance and good processability.