565 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 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 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 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 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 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 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.

The invention belongs to the field of aluminum-based composite material recycling, and particularly relates to an aluminum-based composite material machining chip recycling method which comprises the steps that oil stains and floating dust on the surfaces of machining chips are removed, and the machining chips are crushed into sheets; carrying out alkali washing and acid washing cleaning to remove an oxide layer; determining a reinforced phase mass fraction through pickling; stirring the flaky material, and performing gravity settling to obtain particles arranged in parallel; performing low-temperature vacuum sintering to obtain a billet; and the aluminum-based composite material with high interface bonding strength and good uniformity is prepared through high-temperature plastic deformation. And the particle reinforced aluminum matrix composite material processing chips are recycled, so that the machining loss is reduced. And the oxide layer is removed, and the particle sintering difficulty is reduced. And the processing chips are arranged in parallel, so that the problems that the sheet-shaped aluminum-based composite material particles are not dense in hot pressing and easy to generate pores due to high strength are solved, and a new scheme is provided for recycling and reusing the composite material.

The invention relates to a multi-pass pressure sintering-based high-quality preparation method of a low-cost multi-reinforcement-containing aluminum-based composite material, in particular to a multi-pass pressure sintering-based high-quality preparation method of a low-cost multi-reinforcement-containing aluminum-based composite material. The method aims at solving the problems that in the powder metallurgy preparation process of the aluminum-based composite material, the density is low, the mechanical property is poor, and interfaces between reinforcement bodies with different properties and a base body are not matched. The method comprises the following steps: 1, weighing a reinforcement material and an aluminum-containing material; 2, uniformly mixing the powder through a mechanical ball milling method or a V-shaped mixer; 3, the mixed powder is put into a mold; 4, performing cold pressing to prepare a prefabricated body; 5, multi-pass hot pressed sintering; and 6, demolding. The aluminum-based composite material is prepared at low equipment cost, and is high in density, excellent in mechanical property and good in hot working property. The aluminum-based composite material can be applied in various scenes through the matching of different types of reinforcements with different volume fractions and the aluminum-containing material.

The invention provides a die-casting forming method for a graphene reinforced aluminum matrix composite brake disc, and belongs to the field of brake disc preparation. The method comprises the following steps: carrying out surface modification treatment on graphene; mixing the modified graphene with the aluminum alloy melt; the brake disc is formed through a die-casting process; and the formed part is subjected to heat treatment to optimize the organization structure of the formed part. The brake disc prepared by the method has excellent thermophysical properties and mechanical properties, and is suitable for a high-performance automobile brake system.

The invention belongs to the technical field of aluminum-based composite materials, and particularly relates to a heat-resistant cyclic wear-resistant aluminum-based composite material and a preparation method thereof.Based on the total mass of the aluminum-based composite material, the heat-resistant cyclic wear-resistant aluminum-based composite material comprises an aluminum alloy matrix and a SiC particle reinforcement with the mass fraction of 15%-25%, and the SiC particle reinforcement is a mixture of micron-sized particles and submicron-sized particles; the particle size of the micron-sized particles is 10-100 [mu] m, the particle size of the submicron-sized particles is 0.3-0.8 [mu] m, the addition amount of the submicron-sized particles accounts for 0.1-2% of the total mass of the composite material, and the composite material has good wear resistance and good heat-resistant cycle performance at the normal temperature of minus 300 DEG C. The prepared SiC particle aluminum-based composite material brake disc can avoid excessive decline of material hardness, wear resistance and friction coefficient caused by thermal cycle in a repeated braking process.

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 provides an aluminum matrix composite laser welding structure and a welding method thereof. The welding structure comprises a first base material, a second base material, a middle layer, a first foil layer and a second foil layer. The first base material is made of a silicon carbide particle reinforced aluminum-based composite material; the second base material is a silicon carbide particle reinforced aluminum-based composite material; the middle layer is formed by mixing and pressing modified silicon carbide particles and active metal powder; one side of the first foil material layer abuts against the first base material, and the other side of the first foil material layer abuts against the middle layer; one side of the second foil material layer abuts against the second base material, and the other side of the second foil material layer abuts against the middle layer. The structure of the weld joint can be effectively improved, welding defects are reduced, and the connection strength and overall performance of the weld joint are improved.

A forming device for producing a high-performance aluminum-based composite material relates to the technical field of aluminum-based composite material production and comprises a rack, a support frame is fixed at the top of the rack, a discharge hopper is fixed at the top of the support frame, a spiral heating pipe is fixed at the bottom of the support frame, and the heating pipe can cover the outer side of a mold. A supporting table of the rack is rotationally connected with a rotating seat through a bearing, a first driving mechanism for driving the rotating seat to rotate is installed on a supporting frame, a plurality of containing frames used for containing molds are evenly distributed on the rotating seat, and ejection mechanisms are installed on the inner sides of the containing frames. According to the forming device for production of the high-performance aluminum-based composite material, a worker does not need to take and place a forming mold from a mold clamping groove with the help of an external tool any more, time and labor are saved, and therefore the production efficiency is 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.

The invention belongs to the field of PCBs (printed circuit boards), and provides a PCB material with high heat dissipation performance and a preparation method thereof.The PCB material adopts a multi-layer composite structure design and comprises a circuit board layer, a heat conduction insulating layer, a metal bottom layer, a silica gel-based heat conduction glue layer, a heat dissipation layer and heat dissipation fins, wherein the heat conduction insulating layer is a polyimide composite material in which hexagonal boron nitride nanosheets are oriented in parallel, and the heat dissipation layer is formed by coating an aluminum nitride reinforced aluminum-based composite material with a titanium nitride transition layer and is integrally die-cast with the heat dissipation fins. Through key technologies such as surface modified boron nitride nanosheet suction filtration orientation, polyamide acid dipping curing, heat dissipation assembly preparation through a coating-in-situ nitriding-die casting process and overall hot pressing assembly, the excellent heat conduction performance of the heat conduction insulating layer in the plane direction is achieved; the problems of low heat dissipation efficiency, poor device reliability and the like caused by insufficient heat-conducting property and insulating property of a traditional PCB material are solved, and the material has wide application value.

An aluminum-based composite material and a brake disc made of the composite material are provided. The material includes a base material and a reinforcing phase. The base material includes the following components in mass percentage: 4.0-7.0% of Cu, 0.4-1.2% of Mg, and 0.1-0.8% of Ag, with the balance being Al. The reinforcing phase can be SiC particles having a volume percentage of 10-40%.

The invention relates to a graphene / aluminum composite material preparation method, in particular to a graphene / aluminum composite material preparation method for regulating Mg element interface segregation through double reinforced phases. The invention aims to solve the problem that Mg element segregation is easy to occur when an aluminum-based composite material is prepared from graphene or silicon carbide in the prior art. In the pressure infiltration preparation process, due to the fact that two reinforcing phases of graphene and silicon carbide exist in a prefabricated body, the Mg element begins to segregate towards the position near the reinforcing body in the infiltration process, however, due to the fact that graphene and silicon carbide have the attraction effect on the Mg element, the Mg element cannot be completely segregated to an interface of one reinforcing phase, and therefore the Mg element can not be completely segregated to the interface of the reinforcing phase. And more Mg elements stay in a matrix between the graphene and the silicon carbide, so that the interface segregation amount of the Mg elements is reduced, the content of the Mg elements in the matrix is increased, the sequence of precipitated phases of the composite material after solid solution aging is corrected, and the comprehensive mechanical property of the composite material is improved.

The present invention belongs to the technical field of composite material preparation, and particularly relates to a high-performance conch shell bionic structure aluminum-based composite armor and a forming method thereof. The forming process is as follows: first, mix powders, then stack and compact the powders to form a fixed combination, solutionize the laminated material of the combination and immediately perform hot rolling, and then perform aging treatment. Deep cryogenic treatment can be carried out after aging; at least one layer in the intermediate layer of the laminated material before rolling is composed of powders, and the high-strength layer is located between metal plates. The high-strength layer is composed of ceramic particles and metal particles evenly mixed. The present invention first attempts to introduce powders between two metal plates. By virtue of the high activity of the powders, solutionizing is carried out first and then rolling, which can improve the diffusion of the powders and achieve better bonding. The strong and tough alternating stacking of the conch shell structure causes cracks to deflect when passing between layers, and will bypass the particles when passing through the particles in the high-strength layer to achieve deflection. This form of multiple reciprocating deflection of cracks can improve the energy absorption rate, thereby improving the impact resistance, and also greatly improving the strength and toughness of the aluminum-based composite armor.

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.