169 results about "Magnesium matrix composite" patented technology

A laser additive manufacturing system and method for a magnesium-based composite material. The system comprises a laser adjuster (1), a laser (2), a forming cover (3), an oxygen content adjuster (4), an inert gas cylinder (5), a powder feeder (6), a substrate (7) and a wire feeder (8), wherein the laser adjuster is used for controlling laser processing parameters of the laser; the laser is connected to a laser processing head (10) by means of an optical fiber (9); the oxygen content adjuster is in communication with the forming cover, so as to control the oxygen content of a processing environment in the forming cover; the inert gas cylinder and the powder feeder both pass through the forming cover to be connected to the laser processing head; the substrate is located inside the forming cover; the wire feeder is connected to a wire feeding head (12) by means of a wire feeding tube (11); the wire feeding head passes through the forming cover to perform laser additive manufacturing for a magnesium-based composite material, together with the laser processing head; and a real-time cooling sleeve (13) is also mounted on the wire feeding tube. Also provided are a method for preparing a magnesium-based composite material using the laser additive manufacturing system for the magnesium-based composite material, and a prepared magnesium-based composite material. By means of the manufacturing system and method, the additive processing of wires and powder is realized, and a magnesium-based composite material with a good mechanical property is prepared.

The invention discloses a biomedical magnesium-based composite material as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The preparation raw materials of the biomedical magnesium-based composite material comprise nanometer manganese coated micron titanium particles and magnesium-zinc-zirconium alloy powder; the mass of the micron titanium particles accounts for 1%-5% of the mass of the magnesium-zinc-zirconium alloy powder, and the mass of the nano manganese accounts for 1%-2% of the mass of the magnesium-zinc-zirconium alloy powder; the magnesium-zinc-zirconium alloy powder contains 1wt%-6wt% of zinc, 0.5 wt%-1wt% of zirconium and the balance of magnesium; a nano-scale MnZn2 phase is formed in the biomedical magnesium-based composite material, and part of manganese exists in a magnesium alloy matrix formed by magnesium-zinc-zirconium alloy powder in a solid solution form; the magnesium-based composite material contains 5%-15% by volume of nano twin crystals. The magnesium-based composite material has excellent mechanical properties, corrosion resistance and good biocompatibility, and can meet the requirements of clinical application.

The invention discloses a preparation method of a titanium particle reinforced magnesium-based composite material with good plasticity, which comprises the following steps: 1) liquid casting molding: placing a magnesium matrix in a crucible, introducing protective gas, heating to form a liquid magnesium solution, and preserving heat; the preheated titanium particles are rapidly added into the liquid magnesium melt, a shear force stirrer after preheating is used for stirring, and then after rapid water cooling, an as-cast composite material is obtained; 2) homogenization treatment: carrying out solution treatment on the as-cast composite material in the step 1) at 150-250 DEG C for 6-18 hours; and (3) hot extrusion forming is conducted, specifically, the as-cast composite material subjected to homogenization treatment in the step (2) is preheated and then subjected to hot extrusion, and the titanium particle reinforced magnesium-based composite material is obtained. According to the preparation method, the stirring process is simple and easy to control, compared with a magnesium matrix, the obtained magnesium-based composite material has higher strength and plasticity, the tensile strength can reach 222MPa, the yield strength can reach 151MPa, and the elongation reaches 21%.

The invention discloses a preparation method of a high-capacity magnesium-based composite material based on MOF structure modification, and belongs to the technical field of hydrogen storage materials, the preparation method comprises the following steps: (1) preparing an M-MOF guest material; (2) modifying an aperture structure of the M-MOF guest material; and (3) preparing the MgH2 (at) S-M-MOF compound by a wet impregnation nano confinement method. Compared with a pure MgH2 hydrogen storage material, the MgH2 (at) S-M-MOF compound magnesium-based hydrogen storage material prepared by the nano confinement method has the advantages that the hydrogen absorption and desorption reaction temperature is obviously reduced, and the dynamics is greatly improved; compared with a traditional nano confinement hydrogen storage material preparation process, the preparation method has the advantages that the comprehensive hydrogen storage performance of a compound is enhanced by modifying a pore structure and introducing catalytic elements, the operability is high, the effective loading rate is high, the preparation period is short, and the yield is high; the required raw materials are cheap and easy to obtain, and the preparation process is low in cost, high in safety and suitable for industrial production and popularization.

The invention relates to a preparation method of a multi-scale SiC particle heterostructure reinforced magnesium-based composite material, and belongs to the field of metal-based composite materials and preparation thereof. According to the preparation method, an in-situ authigenic second phase generated by rare earth elements is added, micron-scale, submicron-scale and nano-scale SiC reinforcement particles form a heterostructure formed due to size difference, and after a subsequent plastic deformation process, the multi-scale reinforcement particles form a heterostructure with a layered distribution characteristic; the effects of second phase strengthening, reinforcement particle strengthening and heterostructure strengthening are generated, and meanwhile the modulus and strength of the magnesium-based composite material are improved. And moreover, a stirring casting mode is adopted for preparation, the production process is shortened, the production cost is reduced, the high-modulus and high-strength magnesium-based composite material is prepared, and the preparation method has important significance in promoting application of the high-performance magnesium-based composite material and expanding the application range of the magnesium-based composite material in the fields of automobile industry, aerospace and the like.

The invention discloses a nanocarbon-copper heterogeneous interface construction method for improving the electromagnetic shielding and heat-conducting properties of a graphene / magnesium composite material and a composite material based on the nanocarbon-copper heterogeneous interface construction method, and belongs to the technical field of heterogeneous interfaces. The method comprises the following steps: mixing intrinsic graphene, a surfactant and a foaming agent, performing ultrasonic dispersion treatment in solvent water, and performing freeze drying to obtain an intrinsic graphene preform; performing chemical vapor deposition on the intrinsic graphene preform serving as a substrate, and performing in-situ deposition of nanocarbon on the surface of the intrinsic graphene preform to obtain an intrinsic graphene-nanocarbon preform; a copper-containing oxidizing agent and a reducing agent are added into ethyl alcohol for ultrasonic treatment, an ethyl alcohol solution is obtained, the intrinsic graphene-nanocarbon prefabricated body is added into the ethyl alcohol solution, standing and drying treatment are conducted, then heat treatment is conducted, and an intrinsic graphene-multi-dimensional nanocarbon-nanocopper prefabricated body is obtained; and heating is conducted under argon protection, a magnesium alloy matrix is placed on the intrinsic graphene-multi-dimensional nano carbon-nano copper prefabricated body for liquid-solid infiltration extrusion, and the intrinsic graphene reinforced magnesium-based composite material is obtained. The method is used for solving the problems that existing intrinsic graphene of a three-dimensional network structure cannot have excellent electromagnetic shielding performance and heat-conducting performance at the same time, and existing magnesium-based composite materials only conduct single electromagnetic shielding performance or heat-conducting performance regulation and control.

The invention belongs to the field of composite materials, and particularly discloses a magnesium-based composite material and a preparation method and application thereof.The preparation method comprises the following steps that S1, magnesium-based alloy particles are heated to be in a semi-solid state, then the magnesium-based alloy particles are mixed with metal reinforced particles, and semi-solid mixed slurry is obtained; and S2, the semi-solid mixed slurry is subjected to pressurized extrusion molding, and the magnesium-based composite material is prepared. According to the preparation method, the metal reinforced particles and the semi-solid magnesium-based alloy slurry are mixed, extrusion molding is conducted under pressurization, continuous production can be achieved through the whole preparation method, the production process is short, the efficiency is high, meanwhile, a semi-solid extrusion method is adopted, and the production cost is low. The prepared magnesium-based composite material has the advantages of compactness, no loose defect, uniform distribution of metal reinforced particles, high mechanical strength and the like.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention belongs to the technical field of metal material science, and particularly relates to a heterostructure plasticized magnesium-based composite material, a preparation method and application. A preparation method of a heterostructure plasticized magnesium-based composite material comprises the following steps that S1, AZ61 magnesium alloy powder, pure titanium carbide and stearic acid are mixed and subjected to low-speed and high-speed ball milling, mixed powder is obtained, and powder loading and cold pressing are conducted after the powder is cooled; and S2, the powder obtained after cold pressing in the S1 is subjected to a gradient heating exhaust vacuum hot pressing process, cooling is conducted, thermal deformation is conducted, and the heterostructure plasticized magnesium-based composite material is obtained. The plasticity of the prepared magnesium-based composite material is obviously improved, and the application potential of the magnesium-based composite material in the industrial field is expanded.

The invention discloses a method for preparing a magnesium-based composite material based on semi-solid injection molding and a product and application of the magnesium-based composite material, and belongs to the technical field of magnesium-based composite material preparation.The method comprises the following steps that a semi-solid injection molding method is adopted, a mixture of magnesium alloy matrix particles (millimeter-level) and high-entropy alloy powder is sequentially heated and stirred, and the magnesium alloy matrix particles (millimeter-level) and the high-entropy alloy powder are obtained; performing injection molding and cooling to obtain a sample; and the sample is annealed, and the magnesium-based composite material is prepared. Wherein the magnesium alloy matrix particles comprise the following components in percentage by mass: 1-9% of aluminum, 1-7% of zinc and the balance of magnesium and inevitable impurities (impurity elements are less than or equal to 0.1%); the high-entropy alloy powder is particles containing Al, Co, Cr, Fe and Ni elements, and the particle size is 0.5-50 microns. Magnesium alloy matrix particles and AlCoCrFeNi particles are mixed, and then a semi-solid injection molding technology is combined, so that the sedimentation problem of a high-density reinforced phase can be eliminated, the reinforced phase is uniformly dispersed in the material, and the comprehensive mechanical property of the composite material is further improved.

The invention belongs to the field of metal composite materials, and particularly discloses a preparation method of a high-toughness titanium alloy frame reinforced magnesium-based composite material, and the preparation method comprises the following steps: arranging and fixing titanium alloy wires in a mold to obtain a titanium alloy frame; then magnesium alloy is injected into the titanium alloy frame, compression molding is conducted after vibration, and a composite material blank is obtained; and sintering the composite material green body to prepare the magnesium-based composite material. The magnesium-based composite material prepared through the preparation method is reinforced through the titanium alloy frame, the titanium alloy frame and the magnesium alloy have a good bonding interface and have high mechanical performance and low density, specifically, the yield strength is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 500 MPa, the elastic modulus is larger than or equal to 80 GPa, the density is smaller than or equal to 3.2 g / cm < 3 >, and the problem that existing magnesium alloy is poor in strength is remarkably solved.

The invention discloses a magnesium-based composite material with high hydrolysis hydrogen production conversion rate and a preparation method thereof, belonging to the technical field of hydrogen production materials and their preparation processes. The preparation method comprises the following steps: step 1, preparing a Mg-Ca binary alloy; step 2, mechanically crushing the obtained Mg-Ca binary alloy to obtain Mg-Mg 2 Ca alloy particles; step three, then in Mg-Mg 2 Mg-Mg 2 Ca-composite metal carbide-Ni composite powder; Step 4, Mg-Mg 2 The Ca-composite metal carbide-Ni composite powder is placed in a tableting mold and pressed into a block or sheet material using a tablet press to obtain a magnesium-based composite material with a high hydrolysis hydrogen production conversion rate. The preparation process of the present invention is simple, low in cost, and short in time. The composite material can quickly prepare a large amount of hydrogen with a high conversion rate and is suitable for industrial production.

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

The additive manufacturing device is arranged in a machine body of a 3D printer and comprises a laser device, a sealing cover, an ultrasonic vibrator, an induction heater, a forming base plate, an induction power source, a heat insulator, a deposition head and an oxygen controller. The forming substrate is arranged in the induction heater, the deposition head is arranged above the forming substrate, the induction heater is arranged at the output end of the ultrasonic vibrator, the heat insulator is arranged between the induction heater and the ultrasonic vibrator, the induction power source is electrically connected with the induction heater, and the ultrasonic vibrator is used for making the forming substrate vibrate. The induction heater is used for preventing heat from being transmitted to the ultrasonic vibrator, and the oxygen controller communicates with the sealing cover and controls the oxygen content of the machining environment in the sealing cover. According to the additive manufacturing device for forming the magnesium-based composite component and the additive manufacturing method of the additive manufacturing device, the multi-field coupling auxiliary additive manufacturing synergistic strengthening effect and the nanometer strengthening effect can be achieved at the same time.

The invention belongs to the technical field of preparation and application of non-ferrous metal composite materials, and particularly relates to a ceramic particle premixing reinforced magnesium-based composite material semi-solid die casting method and system. A preparation step of prefabricated composite particles is added in front of a feed port of the semi-solid hydraulic casting pulping machine, and the prefabricated composite particles are obtained by heating, melting, premixing, cooling and crushing interface-optimized ceramic particles and magnesium-based alloy particles. The ceramic particles are subjected to interface optimization treatment and further premixed with the magnesium-based alloy through a specific premixing process, the ceramic particles and the magnesium-based alloy cooperate with each other to prepare prefabricated composite particles, and a high-quality metallurgical bonding interface is formed under controllable conditions; the prefabricated composite particles are used as feeding materials of a semi-solid die-casting process, the raw material basis of semi-solid die-casting is thoroughly changed, the uniformity and excellent interface of a final composite material product are ensured, and therefore the mechanical property of the composite material is remarkably improved.

A brake rotor for a motor vehicle having a composite structure may include an annular body defining opposite friction surfaces of the brake rotor. The annular body may include a core made of a lightweight, magnesium-based alloy; a thermal barrier layer made of a thermally insulating material disposed on the core; and a wear-resistant layer made of an Al—Fe—Si—Zr alloy of aluminum (Al)+iron (Fe)+silicon (Si)+zirconium (Zr) that is disposed on the core over the thermal barrier layer. The wear-resistant layer may define a first one of the opposite friction surfaces of the annular body.

The application discloses a magnesium-based composite material and a preparation method and application thereof. The magnesium-based composite material comprises ferroferric oxide and a magnesium alloy. The magnesium alloy comprises the following components in percentage by weight: 3wt.%-6wt.% of Zn, 0.3wt.%-0.8wt.% of Ca, and the rest of Mg and inevitable impurities. The magnesium-based composite material can effectively solve the problem that micron-sized particles are easy to agglomerate in a metal liquid when the magnesium alloy is modified, and the plasticity of the alloy is reduced and the alloy is not easy to be formed.

The invention discloses a preparation method of a high-hardness high-wear-resistance magnesium-based composite material, which comprises the following steps: material preparation, remelting, casting and extrusion: adding mass B4C at the semi-solid temperature of AZ91 alloy, stirring and cooling to form a casting rod for later use; additionally preparing an AZ91 alloy solution; a mold with the proper diameter is selected, the standby casting rod is placed in the center of the mold, the AZ91 alloy solution is poured into the mold, meanwhile, the mold is placed on a vibration platform to be continuously vibrated till the solution is completely solidified, and the magnesium-based composite material is formed; and the magnesium-based composite material which is completely solidified is subjected to texture heat treatment and cooling, and then is heated again for extrusion deformation. The problem that an existing composite material is difficult to extrude is effectively solved, meanwhile, the hardness of an alloy layer is greatly improved, internal defects are remarkably reduced, and the material density is improved; meanwhile, B4C particles are promoted to be uniformly dispersed in a matrix, local agglomeration is avoided, and the hardness and wear resistance of the composite material are improved; and the cracking risk in the extrusion process is effectively reduced.

The invention discloses a biological magnesium-based composite material with a gradient structure and a preparation method of the biological magnesium-based composite material, and the magnesium-based composite material is prepared from the following components in percentage by mass: 5.0% of Mn, 3.5-6.5% of Zn, unavoidable impurity elements and the balance of Mg. According to the method, under the low rolling friction speed, grains can be rapidly and obviously refined, the bar is stressed in three directions, the shape and size precision of the bar is obviously improved, and the grain size of the bar is in gradient distribution from the surface to the interior of the bar. In addition, the size and distribution of metal Mn particles are also improved in the three-way rolling friction process, so that the biological magnesium-based composite material with better mechanical performance and corrosion resistance is obtained.

The invention discloses a metallic titanium reinforced magnesium-based composite material and a preparation method thereof, and belongs to the technical field of magnesium alloy materials. The preparation method comprises the following steps that a magnesium alloy matrix is subjected to vacuum melting, then the magnesium alloy matrix is cooled to the semi-solid temperature of the magnesium alloy matrix, composite powder with magnesium powder coated with titanium particles is added into the semi-solid magnesium alloy matrix in a low-rotating-speed state, and then mixing is conducted under the high-rotating-speed condition; after mixing is finished, the temperature is increased to the casting temperature of the magnesium alloy matrix for casting, and an as-cast composite material is obtained; and the as-cast composite material is subjected to solution treatment and hot extrusion, and the metal titanium reinforced magnesium-based composite material is obtained. According to the method, titanium particles can be uniformly distributed in a magnesium alloy matrix, grains are refined, and the tensile strength and the ductility of the metal titanium reinforced magnesium-based composite material are improved.

The application discloses a degradable fracture fixation device, which comprises a fixing part, a suture and a tensioning mechanism, one end of the suture is connected with the fixing part, the other end of the suture is connected with the tensioning mechanism after passing through a separation site and a bone body, and the tensioning mechanism is used for tightening the suture so as to fix the separation site on the bone body; the tensioning mechanism comprises a positioning cylinder, a tensioning part is movably arranged in the positioning cylinder, and the tensioning part is connected with the suture. The fixing part and the tensioning mechanism are both made of degradable materials, and the degradable materials are any one of magnesium or a magnesium alloy or a magnesium-based composite material, zinc or a zinc alloy or a zinc-based composite material, and iron or an iron alloy or an iron-based composite material. The fixing device has the advantages of simple structure, convenient use, simplified operation process, shortened operation time, favorable operation completion of doctors, good fixing effect on the separation site, prevention of tearing of the separation site, promotion of post-operation recovery of patients and the like.

The invention discloses a preparation method of a coarse / fine grain double-structure texture graphene-magnesium-based composite material, and belongs to the field of metal material preparation. According to the method, graphene forms an enrichment area and a lean area in a magnesium matrix through a powder mixing process, and then cold pressing, sintering and hot extrusion forming are performed to prepare the composite material with a coarse grain and fine grain double-structure tissue. According to the method, the problem that plasticity of a traditional graphene-magnesium-based composite material is reduced due to the fact that grains are too refined is solved, the material strength is remarkably improved, and meanwhile the ductility and toughness of the material are effectively improved. The preparation method is simple in process, low in cost and suitable for preparation of light high-strength structural materials such as low-altitude aircrafts and new energy automobiles, and has wide application prospects.

The invention provides a resistance self-heating type solid hydrogen storage reactor, which belongs to the technical field of hydrogen energy storage and comprises a solid hydrogen storage component, a heat management component and an electric heating component. The porous solid hydrogen storage material is a magnesium-based composite material doped with coal ash and slag, has a porous structure and intrinsic conductivity, and realizes rapid and uniform spontaneous heating through a Joule effect; the heat exchange plates and the hydrogen storage materials are alternately distributed, a circulating pump drives a heat exchange medium and a phase change material storage tank to form closed-loop heat management, and heat recovery in the hydrogen storage stage and heat supply in the hydrogen desorption stage are achieved; the electric heating unit supplements Joule heat through an external power supply, and the operation state is controlled in real time in combination with the temperature regulation and control module. The problems of thermal response lag, uneven temperature and high energy consumption of traditional solid hydrogen storage are solved, the hydrogen storage / desorption rate, the cycle stability and the energy utilization efficiency are remarkably improved, and the method is suitable for large-scale long-period hydrogen storage of renewable energy sources.

The invention discloses an in-situ generated high-entropy particle reinforced magnesium-based composite material and a preparation method thereof, the composite material comprises Mg, Y, Dy, Ho and Er elements, the atomic ratio of Mg / Y + Dy + Ho + Er is greater than 10: 1, and the atomic ratio of Y to Dy to Ho to Er is 1: 1: 1: 1. The atomic ratio of Mg / Y + Dy + Ho + Er is larger than 10: 1, the atomic ratio of Y, Dy, Ho and Er is 1: 1: 1: 1: 1, Mg24 (Y0.25 Dy0.25 Ho0.25 Er0.25) 5 high-entropy particles can be generated after rare earth atoms are subjected to solid solution, the high-entropy particles serving as reinforcements have high strength and high hardness, and the strength and hardness of the composite material can be remarkably improved; meanwhile, in-situ synthesized Mg24 (Y0. 25Dy0. 25Ho0. 25Er0. 25) 5 high-entropy particles and an Mg matrix form a coherent interface, dislocation can be extended, plastic deformation of the material is coordinated, and when the room temperature of the prepared composite material is 25 DEG C, the yield strength is 212 MPa, the tensile strength is 361 MPa, the Vickers hardness is 107 Hv, and the ductility is 10.6%; the high-entropy particle reinforced Mg-based composite material is generated in situ, so that the room-temperature strength and ductility of the alloy can be synergistically improved.

The utility model discloses a kind of magnesium-based composite material forming equipment, it is related to composite material preparation technical field, including material pipe, main feeding mechanism, auxiliary feeding mechanism, heating assembly and main push assembly;Material pipe front end is communicated with the forming cavity of die casting mould, and the length direction of material pipe is spaced and provided with at least two feeding positions;Main feeding mechanism is fed into magnesium alloy matrix to material pipe rear end;Auxiliary feeding mechanism is movably arranged and is fed into the inner cavity of material pipe with carbon fiber powder in any one feeding position;Main push assembly is used to push magnesium alloy matrix forward, so that magnesium alloy matrix is melted to form semi-solid slurry under the heating action of heating assembly, and mixed with carbon fiber powder to form semi-solid composite slurry, then semi-solid composite slurry is pushed forward to the forming cavity and is die casting formed.This scheme can control the interface reaction degree of carbon fiber and magnesium alloy matrix, effectively avoid the generation of harmful interface, so as to obtain ideal interface bonding effect.

The application discloses a numerical simulation method for particle dispersion in a molten pool of a laser surface remelting particle reinforced magnesium matrix composite, and belongs to the technical field of numerical simulation of particle dispersion in a molten pool of a composite material.The application solves the problem that the particle dispersion in a laser surface remelting (LSR) process of a particle reinforced magnesium matrix composite cannot be accurately predicted at present.The temperature gradient and the primary dendrite arm spacing in the molten pool are obtained based on experimental characterization, so that the liquidus and eutectic reaction temperature of non-equilibrium solidification are calculated.The liquidus and eutectic reaction temperature of non-equilibrium solidification are used to calculate the molten pool evolution in the LSR process of the magnesium matrix composite, so that the molten pool formation characteristics and the migration behavior of the particles in the molten pool can be more accurately predicted, the particle dispersion in the molten pool formation process of the particle reinforced magnesium matrix composite can be accurately predicted, and theoretical guidance is provided for in-depth understanding of the molten pool evolution process in the laser forming process of the composite material and process parameter optimization.The application can be applied to the prediction of the particle dispersion in the molten pool of the composite material.

The invention relates to an antifouling and antibacterial micro-arc oxidation product and a preparation method thereof. The preparation method comprises the following steps: adding copper-containing powder into a workpiece to be subjected to micro-arc oxidation; the workpiece to be subjected to micro-arc oxidation is subjected to oxidation treatment through a copper-free micro-arc oxidation electrolyte, the copper-free micro-arc oxidation electrolyte comprises main salt, an additive, a pH regulator and water, the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH regulator is 0-10 g / L. No copper-containing component needs to be added into the micro-arc oxidation electrolyte, so that the stability of the electrolyte is improved, and the maintenance cost is reduced. In addition, the copper-containing micro-arc oxidation antifouling and antibacterial coating can be prepared on non-valve metal by adopting the preparation method disclosed by the invention. Meanwhile, the method is particularly suitable for preparing the antifouling and antibacterial coating on the surface of the copper-containing particle reinforced magnesium-based composite material.

The invention relates to the technical field of materials, in particular to an electronic equipment frame, a preparation method thereof and electronic equipment. The electronic equipment frame comprises a middle plate and a frame fixedly connected to the periphery of the middle plate. Wherein the frame comprises a magnesium-based composite material, a powder material reinforcement body is doped in the magnesium-based composite material, and the elastic modulus of the magnesium-based composite material is not lower than 55 GPa; the middle plate comprises magnesium alloy with the heat conductivity coefficient not lower than 90 W / m.k. According to the electronic equipment frame body, the high-modulus magnesium-based composite material serves as the frame, the high-thermal-conductivity magnesium alloy serves as the middle plate, the frame and the middle plate are fixedly connected, meanwhile, the performance of high strength, high modulus, high thermal conductivity and the like is achieved, the overall structural stability of electronic equipment can be enhanced, the overheating phenomenon can be reduced, and the service life of the electronic equipment is prolonged. The damage risk of internal elements of the electronic equipment caused by thermal stress is reduced, the service life of the electronic equipment is prolonged, and lightweight design of the electronic equipment is facilitated.

The invention provides a SiCp reinforced magnesium-based composite material casting and a casting method thereof.The casting method comprises the following steps that magnesium alloy and magnesium intermediate alloy are mixed and heated to be completely melted, and alloy melt is obtained; wherein the magnesium intermediate alloy contains rare earth elements; adding a preheated SiCp reinforced phase into the alloy melt by adopting a method of combining semi-solid stirring and liquid ultrasonic assistance, and stirring and mixing to obtain a magnesium-based composite material melt; after the magnesium-based composite material melt is heated to the target temperature, the magnesium-based composite material melt is rapidly poured into a preheated casting mold, after casting is completed, the cooling speed is controlled till the melt is cooled, and the SiCp reinforced magnesium-based composite material is obtained; and the SiCp reinforced magnesium-based composite material is put into a hot isostatic pressing process heating furnace to be treated, and the SiCp reinforced magnesium-based composite material casting is obtained. According to the casting method, the mechanical property of the magnesium-based composite material casting can be improved on the basis that the casting defects of the SiCp reinforced magnesium-based composite material casting can be remarkably reduced.

The invention discloses a numerical simulation method for a microstructure of a laser surface remelting particle reinforced magnesium matrix composite, and belongs to the technical field of numerical simulation of the microstructure of the composite. The method solves the problem that an existing numerical simulation method does not fully consider the interaction between dendritic crystal growth and particle movement. According to the method, on the basis of an electronic probe experiment characterization result, a real solid-phase component field of an as-cast state serves as an initial condition of calculation, the actual solidification process is reproduced more truly, meanwhile, microstructure evolution and particle movement are subjected to coupling calculation, and a cellular automaton technology is adopted for simulating magnesium alloy with reinforced particles; the influence of dendritic crystal growth on particle motion is considered, numerical prediction of the microstructure of the laser surface remelting particle reinforced magnesium matrix composite can be achieved, and microstructure formation and particle migration in a molten pool in the laser melting metal process can be predicted more accurately. The method can be applied to numerical simulation of the microstructure of the particle reinforced magnesium-based composite material.