60 results about "Aluminum matrix composites" patented technology

The application belongs to the field of aluminum-based composite materials, and particularly relates to a kind of additive manufacturing high-performance aluminum-titanium metal composite material and a preparation method thereof. Micron-sized aluminum alloy powder and micron-sized titanium alloy powder are mixed uniformly by ultrasonic-assisted water bath stirring method for laser powder bed melting, wherein the mass fraction of the aluminum alloy powder and the titanium alloy powder is 85-98 wt.% and 2-15 wt.% respectively. The micron-sized titanium alloy powder is used to promote the formation of multi-scale layered structure of equiaxed crystal, core-shell structure, cellular substructure and nano precipitate phase, so as to simultaneously improve the strength and plasticity of the material and realize isotropic mechanical properties. The aluminum alloy-titanium metal composite material for additive manufacturing disclosed by the application has simple and easy-to-control process and low cost, and can be suitable for large-scale production.

The present application belongs to the technical field of aluminum matrix composite material, and particularly relates to a continuous preparation method of in-situ nano-particle reinforced aluminum matrix composite material. The present application uses ZrO2 powder and B2O3 powder as reactants, pre-sprays a coating precursor on the surface of an aluminum plate strip by means of cold-spraying zinc coating as a carrier, then performs continuous rolling treatment and is guided to be put into an aluminum alloy melt to realize controllable introduction of the raw materials. Then, under the comprehensive action of mechanical stirring, dispersion device and auxiliary ultrasonic field, the in-situ reaction of ZrO2 and B2O3 powders in the aluminum alloy melt is promoted to generate nano-sized Al2O3 and ZrB2 reinforcing particles and effectively disperse them, finally the composition of the matrix aluminum alloy is adjusted and cast in a mold to realize uniform and efficient continuous preparation of the in-situ nano-particle reinforced aluminum matrix composite material.

This invention discloses a method and application for anti-crack processing of diesel engine pistons, including the following steps: S1, Refined pretreatment of anti-crack special materials: Differentiated pretreatment processes are adopted for pistons made of aluminum alloy, steel, and aluminum-based composite materials to remove internal defects, refine the microstructure, and reduce residual stress. This invention constructs a complete anti-crack system from material pretreatment, precision forming, processing of easily cracked parts, stress relief, cooling optimization to quality inspection, completely blocking cracks caused by thermal fatigue, mechanical fatigue, stress concentration, corrosion, etc., increasing the crack prevention rate by more than 90% and improving the service life of pistons; at the same time, it is compatible with the processing of pistons made of different materials such as aluminum alloy, steel, and aluminum-based composite materials, and is suitable for various diesel engines such as passenger cars, commercial vehicles, marine engines, and construction machinery. The process parameters can be flexibly adjusted according to the design requirements and operating conditions of different pistons without replacing the entire set of processing equipment, thus reducing production costs.

The application discloses a kind of silicon carbide particle reinforced aluminum matrix composite and preparation method thereof, for the problem of interface reaction and big thermal mismatch stress easily occurring in selective laser melting (SLM) forming, the preparation method provided by the application comprises: high-temperature oxidation (900-1200 ℃, 2-6 h) is carried out to SiC raw material, so that its corner is passivated and in-situ generates 0.5-3 μm thick amorphous SiO2 continuous layer;Modified SiC particles are mixed with AlSi10Mg alloy powder to obtain composite powder with a SiC volume fraction of 15%-20%;Finally, SLM process is used to scan and melt layer by layer forming.The application uses amorphous SiO2 layer as a physical barrier, effectively inhibits the generation of brittle Al4C3 harmful phase, and significantly buffers the thermal mismatch stress.The method is simple in process, effectively eliminates the stress concentration of particle tip, greatly improves the density and comprehensive mechanical properties of the formed part.

This invention relates to the field of aluminum alloy composite materials technology, and in particular to a method for preparing high-temperature, high-strength SiC fiber-reinforced aluminum matrix composite materials. The method involves a combination of magnetron sputtering and hot isostatic pressing to prepare the SiC fiber-reinforced aluminum matrix composite material. From the inside out, the SiC fiber-reinforced aluminum matrix composite material consists of: a SiC fiber core layer, a carbon layer, a titanium layer, a 2024Al alloy matrix, and a 2024Al alloy cladding. Each layer is continuously distributed along the length of the SiC fibers, forming an integral structure with continuous axial reinforcement and radial gradient bonding. This invention can eliminate interfacial stress between the SiC fibers and the aluminum matrix, control the α-Al grain size and precipitated phases in the aluminum matrix, achieve a uniform arrangement of 50% volume fraction of SiC fibers, and the composite material achieves a room temperature tensile strength of over 1400 MPa, a 200°C tensile strength of over 1300 MPa, and a room temperature compressive strength of over 3200 MPa.

The application provides an aluminum matrix composite material and a preparation method thereof, and belongs to the technical field of aluminum matrix composite materials. The Al-Cu-Fe-Ce quasicrystal intermediate alloy is used as a reinforcing phase, the interface area of the composite material is increased, more grain boundary strengthening effects are provided, and the improvement of the mechanical properties of the composite material is facilitated; through solid solution and aging treatment, uniformly distributed beta phases, Al2CuMg phases belonging to the orthorhombic system, beta'' phases and a small amount of beta' precipitated phases can be formed in the aluminum matrix composite material, the morphology, quantity and distribution state of the phases play an extremely important promoting role on the performance of the composite material; the formed beta phases, Al2CuMg phases, beta'' phases and a small amount of beta' precipitated phases are in the form of fine and uniform distribution in the microstructure of the composite material, and the uniform distribution ensures the consistency of the mechanical properties of the material and improves the mechanical properties of the composite material.

This invention belongs to the field of aluminum-based composite material preparation technology, specifically a high-strength and high-toughness aluminum-based composite material based on additive manufacturing technology and its preparation method. The composite material of this invention comprises a matrix material and a reinforcing phase. The matrix material is Al-0.1%Mg-0.6%Si-1.0%Cu-0.5%Mn alloy powder, and the reinforcing phase consists of ZnO powder and pure Cu powder. This invention uses an Al-0.1Mg-0.6Si-1.0Cu-0.5Mn alloy as the matrix and ZnO and Cu particles as the reinforcing phase, utilizing selective laser remelting (SLM) technology to form a novel, high-strength and high-toughness aluminum-based composite material. During the printing process, by performing two laser scans on each layer of metal powder, metallurgical bonding between the reinforcing particles and the matrix is ​​achieved, while simultaneously reducing the material's porosity, refining the grain structure, and significantly improving its mechanical properties.

The application discloses layered multi-scale TiB2 and TiB w The application discloses a preparation method of a hybrid aluminum matrix composite material. The method relates to the technical field of high-strength and high-toughness aluminum matrix composite material preparation. The method comprises the following steps: ball-milling Ti powder and TiB2 powder to uniformly mix the powders; adding deionized water, a dispersing agent and a binder into the mixed powders, uniformly mixing the powders, and preparing uniformly dispersed slurry; pouring the slurry into a mold, placing the mold on a cold source, and performing directional solidification; placing the solidified slurry in a vacuum drying machine, performing freeze drying, and preparing a ceramic green body preform; placing the ceramic green body preform in a furnace, performing sintering, and preparing a ceramic preform; placing the ceramic preform in a hot working mold, performing heating and heat preservation, pouring prepared aluminum melt into the hot working mold, performing pressure infiltration, and preparing an ingot; and performing solid solution and aging treatment on the ingot. The aluminum matrix composite material has high-strength and high-toughness mechanical performance characteristics, and can be used for manufacturing load-bearing structural parts in various fields.

This invention discloses a TiO2 in-situ modified aluminum-based composite material for additive manufacturing and its preparation method, belonging to the technical field of additive manufacturing for preparing aluminum-based composite materials. The method includes the following steps: mixing and sieving TiO2 powder with AA2024 aluminum alloy powder; laser melting the mixed powder to form a composite material, thereby in-situ modifying the AA2024 aluminum alloy with TiO2 to generate an Al3Ti particle-reinforced aluminum-based composite material. This invention utilizes laser melting technology to achieve in-situ modification of the AA2024 aluminum-based composite material with TiO2, resulting in a uniformly dispersed reinforcing phase at the nanometer to submicron scale within the matrix. Simultaneously, it induces the formation of a multi-layered, refined heterogeneous grain structure, significantly improving the material's strength and hardness. Therefore, this invention has significant technical advantages and broad application prospects.

This invention discloses a method for improving the laser welding performance of CNT / Al composite materials through large plastic deformation processing. The method involves pretreatment using large plastic deformation processing, followed by grinding of the surface oxide layer to enhance the laser welding performance of the carbon nanotube-reinforced aluminum matrix composite (CNT / Al). By adjusting the process parameters of large plastic deformation processing, the reinforcing carbon nanotubes in the CNT / Al composite material are completely destroyed to generate nano-Al4C3 phase. With fixed parameters, large plastic deformation processing completely transforms carbon nanotubes into nano-Al4C3 phase, avoiding the formation of large-sized, brittle Al4C3 phase during laser welding. The nano-Al4C3 phase reinforcement allows for more uniform stress distribution, reducing the possibility of fracture at the reinforcement and interface under stress concentration. This effectively reduces porosity defects in the CNT / Al composite material during laser welding.

The application relates to the technical field of continuous ceramic fiber toughened ceramic matrix composite material preparation, and particularly discloses a continuous mullite fiber toughened mullite-alumina matrix composite material (Mu / Mu-Al2O3 composite material) with high mechanical properties and high thermal stability and a preparation method thereof, which comprises the following steps: dispersing mullite powder and alumina powder in different proportions into deionized water to prepare mullite-alumina slurry; preparing a rough blank: immersing the mullite-alumina slurry into mullite fiber cloth after removing glue, then performing mold drying and forming, and high-temperature sintering to obtain a Mu / Mu-Al2O3 composite material rough blank; and then performing later densification on the Mu / Mu-Al2O3 composite material rough blank by using the mullite-alumina slurry to obtain the Mu / Mu-Al2O3 composite material. By introducing high-purity, small-particle-diameter and high-surface-area high-activity mullite powder, the sintering temperature of the mullite-based composite material is reduced, the mechanical properties of the mullite-based composite material are improved, and the high-temperature stability of the composite material is improved.

A process for producing a graphene reinforced aluminum metal matrix composite material, including the steps of providing a flowable aluminum material, combining multiple flattened sheets of graphene or a graphene powder with the aluminum material, and processing the combination to create the aluminum metal matrix composite material incorporating the graphene and orienting the graphene to enhance conductivity. A current carrying article providing high conductive properties is also disclosed and includes an aluminum metal matrix composite combined with an oriented graphene in order to achieve enhanced electrical conductivity.

This invention provides a method for preparing ceramic-reinforced aluminum alloys, belonging to the field of aluminum alloy technology. The method includes: melting an aluminum matrix metal to obtain a melt; heating the melt to a reaction temperature; first adding a reactive flux to perform an aluminothermic reduction reaction; then adding a carbon source; mechanically stirring and performing an in-situ reaction; and applying ultrasonic external field treatment to the melt throughout the in-situ reaction. After the reaction is completed, the melt is held at a high temperature and cooled to obtain the ceramic-reinforced aluminum alloy. The reactive flux includes potassium fluorotitanate and potassium fluorozirconate. This invention, by constructing a (Ti,Zr)C reinforcing phase and synergizing with an ultrasonic-assisted reactive flux method, utilizes solid solution strengthening and acoustic cavitation dispersion to solve the problems of easy coarsening, agglomeration, and weak interfacial bonding of the reinforcing phase in traditional ceramic-reinforced aluminum matrix composites, thereby obtaining a ceramic-reinforced aluminum alloy material with high strength, high toughness, and excellent high-temperature resistance.

This invention discloses a copper-plated SiC fiber cloth reinforced aluminum matrix composite material, its preparation method, and its application. The composite material is prepared by molding and heat treatment using copper-plated SiC fiber cloth as the reinforcement and molten aluminum as the matrix. The composite material possesses the excellent properties of aluminum, copper, and SiC fibers, and through the synergistic effect between aluminum, copper, and SiC fibers, a technical effect of 1+1+1>3 is achieved. The prepared copper-plated SiC fiber cloth reinforced aluminum matrix composite material has the characteristics of being lightweight, having high temperature resistance, high bending resistance, and high impact resistance. Under the condition of ensuring various properties, the volume fraction of SiC fibers can be reduced to only about 3%, thereby controlling the amount of SiC fibers used and effectively reducing the cost of the material.

This invention provides a wide-temperature-range multiphase low-expansion lightweight aluminum-based composite material and its preparation method, belonging to the technical field of ultra-low expansion alloy materials. The aluminum-based composite material is formed by mixing and sintering at least two phases of negative thermal expansion particles and aluminum matrix powder. The negative thermal expansion particles are La... 1‑z C z (Fe 1‑x‑y A x B y ) 13 The series comprises A, a transition metal, B, a metal or half-metal element in the p-block, and C, a lanthanide metal, with a concentration of 0 ≤ x < 0.2, 0.05 < y < 0.25, and 0 ≤ z < 1. The volume percentage of the aluminum matrix is ​​55%–75%. Aluminum is combined with metal-based negative thermal expansion particles. Since metal-based negative thermal expansion materials have higher thermal conductivity than ceramic-based materials, combining them with the aluminum matrix achieves high thermal conductivity. Furthermore, this invention employs at least two phases of negative thermal expansion particles, with the expansion ranges of the two negative thermal expansion particles overlapping to achieve a low expansion effect over a wide temperature range.

This invention relates to the field of metal matrix composites, specifically to a wear-resistant and heat-resistant aluminum matrix composite material with synergistic inorganic phase reinforcement, aiming to solve the problems of poor strength and toughness matching, poor interfacial bonding, and insufficient high-temperature stability in existing aluminum matrix composites. The composite material of this invention consists of an aluminum alloy matrix and multi-scale reinforcing phases, including micron-sized silicon carbide, submicron-sized in-situ nitrides, carbides, and nano-sized in-situ oxides and intermetallic compounds. This invention first prepares a directional layered porous ceramic preform, then uses unidirectional cryogenic casting to obtain a silicon carbide-based ceramic preform with directional parallel channels. Next, vacuum pressure infiltration is combined with the addition of an aluminum alloy ingot containing copper oxide, allowing the molten aluminum alloy to penetrate into the channels of the preform and undergo an in-situ reaction to generate fine reinforcing phases. Finally, after two-stage solution treatment and low-temperature aging heat treatment, nano-sized Al2Cu phases precipitate in the aluminum matrix.

This invention belongs to the field of powder metallurgy technology, and relates to a high-strength and tough multi-scale hierarchical aluminum-based composite material and its powder metallurgy preparation method. The composite material uses aluminum powder, silicon powder, titanium powder, and TiO2 as raw materials. Through a combination of low-temperature powder metallurgy preparation and heat treatment, a multi-scale hierarchical microstructure is generated in situ using solid-state diffusion reactions between the components to produce micron-nano Ti5Si3 particles at grain boundaries and nano-Al2O3 particles within the grains. The preparation method includes: weighing raw materials, graded ball milling and mixing, assembling, degassing and sealing, hot isostatic pressing densification, heat treatment, and machining. This invention achieves stable synthesis of Ti5Si3 and Al2O3 particles through solid-state powder metallurgy; the load-bearing effect of micron-sized Ti5Si3 at grain boundaries and the enhancement of dislocation multiplication and storage capacity by nano-sized Ti5Si3 at grain boundaries and nano-Al2O3 within the grains hinder grain boundary migration and dislocation movement under room temperature / high temperature conditions, synergistically improving the room temperature strength, toughness, and high-temperature performance of the composite material.

The present application belongs to the technical field of aluminum-based material preparation, and particularly relates to a kind of particle reinforced aluminum matrix composite material and its preparation method.The preparation method comprises the following steps: providing aluminum melt with a temperature of 750-950 DEG C;adding additives to the aluminum melt, and the mass ratio of the additives to the aluminum melt is 0.1-30:99.9-70;wherein, the composition of the additives meets the following conditions:i, comprising at least one solid block that has not been powderized;and, ii, in at least one solid block, the liquidus temperature of at least one solid block is > 950 DEG C;continue smelting at 750-950 DEG C to obtain a particle reinforced aluminum matrix composite material.The present application solves the technical problems of high raw material cost and difficulty in effectively improving the volume fraction and distribution uniformity of the reinforcing phase caused by the need for powderization treatment of the reinforcing phase additives due to the melting point difference in the existing liquid phase method, has the advantages of short dissolution process and simple process, and has significant economic benefits.

The application belongs to the technical field of composite materials, and discloses a preparation method of nickel-coated graphene and application of the nickel-coated graphene in aluminum-based composite materials. The preparation method comprises the following steps: obtaining graphene nanosheets by pretreating natural graphite; forming a nickel catalytic seed layer through stannous chloride sensitization and sodium borohydride activation; and performing chemical plating in a plating solution containing nickel sulfate hexahydrate, sodium citrate, ammonium chloride and sodium hypophosphite monohydrate to obtain nickel-coated graphene with a 3-10 nm continuous nickel shell layer on the surface. The nickel-coated graphene is mixed with aluminum-silicon-magnesium alloy powder and ball milled, and then subjected to low-temperature reaction at 350-450 DEG C to generate Al3Ni phase, high-temperature hot pressing densification at 600-650 DEG C to obtain aluminum-based composite materials. The method can effectively control Al-C interface reaction, inhibit the generation of Al4C3, improve the mechanical properties and electrical conductivity of the composite materials, and is suitable for large-scale application.

The present application relates to a kind of component gradient aluminum matrix composite wire and its preparation method, belong to high-performance wire technical field under alternating current environment, by powder metallurgy process, the aluminum alloy wire of component gradient change is quickly prepared, the outermost layer is Al2O3 Particle reinforced pure aluminum, and the electrical conductivity is excellent, the inner layer is carbon nanotube reinforced aluminum alloy, and provide mechanical properties for wire, under alternating current use environment, and the comprehensive performance is excellent, and product production process is simple, and quality is stable, can be used for industrial production.

This application provides a layered composite material, its preparation method, a heat sink, and an electronic device. The layered composite material comprises a layer of aluminum-based composite material and a layer of copper, stacked together. The copper layer includes a layer of elemental copper or a copper alloy layer, and the aluminum-based composite material layer includes at least one of elemental aluminum or an aluminum alloy and a reinforcing material. This layered composite material has a lower density and better mechanical properties than copper. When used as the housing of a heat sink, the copper layer serves as the inner layer of the housing, exhibiting good compatibility with cooling media such as water, resulting in excellent heat dissipation performance.

This invention discloses an aluminum-based carbon nanotube masterbatch, using Al as the metal matrix, MWCNTs as the reinforcing phase, PVP, PVB, and PEG as the organic binder system, and SCA, PCA, and ST as additives. The preparation method includes the following steps: 1. Preparation of aluminum-based carbon nanotube intermediates; 2. Preparation of aluminum-based carbon nanotube masterbatch. The obtained Al-MWCNTs are composed of face-centered cubic aluminum and graphitized carbon, with uniformly sized short columnar particles, φ3╳4 mm in size; the microstructure is composed of tightly packed particles, with uniform surface undulations and consistent pore size. Furthermore, the surface of the aluminum powder particles is covered by a network coating layer formed by CNTs, with a coating layer thickness of 0.2-1 μm and a coating ratio exceeding 85%; the radial compressive strength is 0.6-1.0 MPa. When used in the application of Al / Al-MWCNT, an aluminum-based composite material based on aluminum-based carbon nanotube masterbatch prepared by melt composite method, the tensile strength of Al / Al-MWCNT is 120-140 MPa and the thermal conductivity is 250-270 W / m·K.

A method for preparing an aluminum-based composite material in which silicon carbide nanocrystals and micron-sized particles are layered is disclosed. This invention addresses the problems of uncontrollable reinforcement distribution, difficulty in oriented whisker alignment, and difficulty in achieving dense impregnation of preforms under high ceramic content conditions in existing aluminum-based composite materials. The steps of this invention include: Step 1, acid washing of the whiskers and particles; Step 2, preparation of a slurry; Step 3, freeze casting to form a preform; Step 4, vacuum freeze drying; Step 5, sintering of the preform; and Step 6, extrusion impregnation of the aluminum-based composite material. This invention belongs to the field of aluminum-based composite material preparation technology.

A kind of nano ceramic particle dispersion reinforced aluminum matrix alloy friction stir solid additive manufacturing method and application.The present application belongs to the field of metal solid additive manufacturing.The purpose of the present application is to solve the technical problems of existing ceramic particle reinforced aluminum matrix composite forming process, such as easy agglomeration of ceramic particles, poor performance in vertical processing direction of composite material and cutting difficulty. The method of the present application: according to the atomic ratio of ceramic particles, mixed salt is added to aluminum melt, ceramic particles are generated in situ after stirring for a certain time, then alloy raw materials are added according to the atomic ratio of aluminum matrix alloy for melting, and then casting is carried out to obtain nano ceramic particle reinforced aluminum matrix alloy; the nano ceramic particle reinforced aluminum matrix alloy is used as a self-loss stir head to perform friction stir solid additive manufacturing on the surface of metal base material to obtain nano ceramic particle dispersion reinforced aluminum matrix alloy. The method of the present application is used for forming nano ceramic particle dispersion reinforced 2 series, 3 series, 4 series, 5 series, 6 series and 7 series aluminum alloy.