22 results about "Stir casting" patented technology

The invention discloses a regulation and control method and a preparation method of in-situ ceramic particles of a copper-based composite material. The method comprises the following steps: weighing according to a reaction equation and a reaction molar ratio; the molar ratio coefficient is changed, trace alloy is added, and the size and morphology of in-situ particles are regulated and controlled; the copper-based pre-dispersed in-situ ceramic intermediate alloy reinforcer is prepared through powder mixing, cold pressing and sintering; crushing the reinforcer, remelting, stirring and casting; and after the cast alloy is subjected to heat treatment, the high-performance in-situ particle reinforced copper-based composite material is prepared. According to the obtained in-situ ceramic intermediate alloy reinforcer, pre-dispersion of ceramic particles in a copper matrix can be achieved, and good combination of the particles and the matrix is achieved by adding the copper-based pre-dispersion in-situ ceramic intermediate alloy reinforcer into a molten matrix alloy; interface pores caused by sharp corners, surface pollution and the like of the heterogeneous particles in an external addition method are avoided, and the strengthening effect of the heterogeneous particles is weakened.

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 discloses a magnesium-lithium material ultrathin plate and a forging-rolling composite preparation method thereof, and relates to the technical field of metal-based composite materials, and the magnesium-lithium material comprises the following components (in percentage by mass): 1-15% of Li, 0.5-6% of Al, 0.5-6% of Zn, 0.1-3% of rare earth elements, 4-20% of reinforced particles, and the balance of Mg and inevitable impurities. The preparation method comprises the following steps: 1) composite ball milling pretreatment and vacuum stirring casting; the method comprises the following steps of (1) carrying out heat treatment, (2) carrying out homogenizing heat treatment, (3) carrying out free forging and (4) carrying out multi-pass rolling and intermediate annealing.The method is suitable for preparing the high-strength and high-modulus magnesium-lithium material ultrathin plate with the thickness of 0.5-1.5 mm, the forming problems of particle falling, edge cracking and the like in the magnesium-lithium material machining process are solved, and the prepared magnesium-lithium material ultrathin plate is good in formability and has excellent elastic modulus and strength.

This invention relates to a method for preparing a high-wear-resistant metal-based composite material. This method significantly improves the wear resistance of the material by combining nano-reinforcing particles, surface modification technology, and self-healing capabilities. Aluminum alloy or titanium alloy is selected as the matrix, and nano-sized silicon carbide or alumina particles are used as reinforcing materials. The reinforcing materials are uniformly dispersed using processes such as stir casting, forging, diffusion bonding, infiltration, or powder metallurgy. The composite material structure is then precisely formed using 3D printing technology. The surface of the composite material is treated with a nano-coating or plasma treatment to enhance its wear resistance and corrosion resistance. Furthermore, by embedding microcapsules containing a repair agent into the material, automatic repair of worn areas is achieved, improving the material's reliability and service life. This composite material is particularly suitable for mechanical engineering and automotive manufacturing, especially in the manufacture of automotive brakes under high-wear environments, demonstrating excellent performance and broad application prospects.

The invention discloses a preparation method of a high-quality large-specification copper-nickel-tin alloy round cast ingot. The preparation method comprises the following core preparation processes of burdening, smelting, refining, converter treatment, deoxidation and modification, electromagnetic stirring casting and homogenizing annealing. The ingredients are weighed according to target alloy components, the target alloy components comprise a copper plate raw material, a nickel plate raw material and a tin plate raw material, and the mass fraction of each element is controlled; s2, smelting: adding cathode copper and a nickel plate into a non-vacuum tipping type induction smelting furnace, starting to heat and melt, covering calcined charcoal in the melting process, and continuously starting an electromagnetic stirring device in the smelting process so as to fully stir a melt; s3, refining: after the smelting is finished, uniformly spraying a refining agent into a melt by using high-purity argon gas as a carrier, slagging off and covering charcoal after the refining is finished, and finally sampling in front of a furnace and adjusting components until the components are qualified; a specific refining agent and a specific refining process are adopted, inclusions and gas impurities in the melt can be efficiently removed, and the purity of the melt is remarkably improved.

The application discloses a kind of based on stirring ceramic fiber reinforced aluminum matrix composite and preparation method thereof, belong to composite material technical field.The composite preparation method is: aluminum alloy is heated under stirring state and is fully fused, remove surface oxide film, then add the ceramic fiber silk of pretreatment, improve stirring speed and fully mix, then cast forming, namely obtained;The mass ratio of aluminum alloy and ceramic fiber silk is 4~7:1;The ceramic fiber silk is one of pure ceramic fiber and aluminum base ceramic composite fiber.The method not only greatly improves the dispersivity of fiber reinforced phase, but also greatly improves the infiltration of aluminum alloy matrix to ceramic fiber, effectively improves two-phase interface, so as to significantly improve the mechanical properties of composite material, by testing, with ZL102 aluminum alloy as base material, aluminum base silicon carbide fiber as ceramic fiber reinforced phase, its tensile strength can reach 709MPa, compared with ordinary ZL102 aluminum alloy, it is increased by 443%.

This invention discloses a bilayer thermally conductive material based on interlayer interconnected carbon fibers and its preparation method, belonging to the field of composite material preparation technology. The process includes preparing a CuCrZr / molybdenum / carbon fiber composite material by stir casting, followed by hot and cold deformation to gradually orient the carbon fibers, and then high and low temperature heat treatment under a protective atmosphere. After cutting, a copper / carbon fiber composite layer is obtained. The surface of the copper-carbon fiber composite layer is etched to expose partially exposed carbon fibers, and then carbon fibers / polymers are coated onto the etched surface using a spin-coating process. After curing, the desired bilayer thermally conductive material is obtained. This novel bilayer composite material exhibits high thermal conductivity in the heat dissipation direction. The combined addition of Cr and Zr ensures a sufficient reaction at the copper-carbon interface, resulting in low interfacial thermal resistance, high bonding strength, and minimal thermal conductivity loss after high and low temperature shocks. The preparation method employed in this invention is simple, fast, low-cost, and requires minimal equipment, making it suitable for large-scale production.

The invention relates to a stirring casting preparation method suitable for a superfine SiCp reinforced aluminum-based composite material. The problems that in a traditional technology, wettability of SiCp and aluminum melt is poor, agglomeration is prone to occurring, an Al4C3 brittle phase is prone to occurring, and the melt is prone to being polluted by impurities and high in porosity are solved. The preparation method comprises the following steps: performing in-situ growth of graphene on the surface of SiCp through pulse laser-methane micro-explosion to form a composite reinforced phase; carrying out aluminum alloy fractional smelting and step-by-step stirring to obtain a composite melt; an external coil-iron core assembly is adopted to carry out pulse magnetic oscillation on the melt, and mechanical stirring and argon degassing are synchronously matched; and finally casting and molding. According to the method, generation of Al4C3 can be avoided, uniform dispersion of SiCp is achieved, the density of the obtained composite material is larger than or equal to 99.2%, the 0.2% yield strength is larger than or equal to 220 MPa, the heat conductivity retention rate is larger than or equal to 99%, the increment of the iron content of the melt is smaller than or equal to 50 ppm, ton-level mass production can be achieved based on conventional equipment, and the method is suitable for industrial preparation of the high-performance aluminum-based composite material in the fields of aerospace and automobiles.

The application discloses a preparation method of a carbon fiber reinforced aluminum matrix composite high-performance brake disc and relates to the field of composite materials. An aluminum-silicon-copper alloy is used as a matrix, and nano carbon fibers are introduced; the carbon fibers are subjected to interface pretreatment to enhance the combination with the matrix. The brake disc is prepared through processes such as powder mixing, pre-body pressing, melt immersion stirring, casting forming, heat treatment and processing. The prepared brake disc has excellent performances such as high hardness, good wear resistance, stable friction coefficient, high thermal conductivity, long fatigue life and light weight, and is particularly suitable for brake system applications under high-speed or high-load conditions.

The invention relates to the technical field of yttrium-containing aviation magnesium alloys, in particular to vacuum stirring casting preparation equipment and method for a yttrium-containing aviation magnesium alloy. The vacuum stirring casting preparation equipment for the yttrium-containing aviation magnesium alloy comprises a furnace body, and a charging double-bin, an induction heating smelting device, a stirring homogenizing device and a water-cooling pouring tire film which are arranged in the furnace body, the double charging bins comprise an automatic charging bin and a secondary charging bin, a plurality of material chambers are arranged in the bins, a grid is arranged below each material chamber, and after the grids are opened, the materials are filled under the action of gravity; the stirring homogenization device comprises a control motor, a magnetic coupler, a stepless speed regulation stirring blade and a detachable crucible, and realizes homogenization of components with different densities through positive and negative rotation; the induction heating smelting device generates induction current through medium-frequency alternating current, and heating and melting of materials in the crucible are achieved. And circulating cooling water is introduced into the water-cooling pouring tire film to realize rapid cooling of a melt, so that fine as-cast magnesium alloy grains are formed.

The invention provides a casting defect control method for a complex thin-wall special-shaped heat-resistant cast steel component, and relates to the field of metal casting, and the casting defect control method comprises the steps of S1, wax mold manufacturing, S2, wax mold manufacturing, S3, mold shell manufacturing, S4, vacuum melting, S5, casting molding and S6, shakeout. Wherein the shell is of a structure which is formed by a surface layer, a transition layer, a back layer and a slurry sealing layer and is obtained by coating, sanding and drying in sequence. According to the method, the fired mold and the two-way composite stirring casting technology are combined, so that the manufactured complex thin-wall special-shaped heat-resistant steel component is compact in structure, and the defects of shrinkage porosity, shrinkage cavities, cold shut, insufficient casting, hot cracks and the like are overcome.

The invention discloses a device and a method for improving distribution uniformity of particles in a metal-based composite material, and a method for controlling fluidity of semi-solid slurry during semi-solid rheoforming, and relates to the field of preparation of metal-based composite materials and the field of metal semi-solid forming. The invention aims to solve the problems that particle distribution is not uniform when a metal-based composite material is prepared by a stirring casting method and the fluidity of semi-solid slurry is difficult to control when a large casting is prepared by a rheoforming technology. The device is composed of a crucible and a pore plate assembly, the pore plate assembly is formed by connecting a fixing rod and a pore plate, the outer edge of the pore plate is completely attached to the inner wall of the crucible, the pore plate assembly linearly reciprocates in the crucible through external pressure, and the liquid metal matrix composite or the semi-solid slurry continuously passes through small through holes in the pore plate. The method is mainly used for improving the uniformity of particle distribution in the metal-based composite material or controlling the fluidity of semi-solid slurry.

The application discloses a preparation method of a heat-treatment-free high-strength and high-toughness AZ91 as-cast magnesium alloy, and belongs to the technical field of magnesium alloy material preparation, and solves the technical problem that a commercial AZ91 as-cast magnesium alloy needs to be subjected to a complicated heat treatment process to realize regulation and control of the structure and performance. The method comprises the following steps: S1, nano-grain refiner pre-attachment treatment; and S2, heat-treatment-free preparation of the high-strength and high-toughness AZ91 as-cast magnesium alloy. Through a special stirring casting process, liquid-state addition of the pre-attached nano-grain refiner, melt purification treatment, high-temperature air-cooling solidification technology, the AZ91 magnesium alloy ingot with a tensile strength greater than or equal to 200 MPa and an elongation greater than or equal to 7% is directly cast into a shape without subsequent heat treatment, and the problems of high energy consumption, coarse grains and mechanical property anisotropy of the traditional AZ91 alloy caused by T6 heat treatment are solved.

The invention discloses a ceramic fiber reinforced aluminum-based composite material based on stirring casting and a preparation method of the ceramic fiber reinforced aluminum-based composite material, and belongs to the technical field of composite materials. The preparation method of the composite material comprises the following steps: heating and fully melting the aluminum alloy in a stirring state, removing a surface oxidation film, then adding the pretreated ceramic fibers, increasing the stirring rotating speed, fully mixing, and then casting and molding, so as to obtain the composite material. The mass ratio of the aluminum alloy to the ceramic fibers is (4-7): 1; the ceramic fibers are one of pure ceramic fibers and aluminum-based ceramic composite fibers. According to the method, not only is the dispersity of a fiber strengthening phase greatly improved, but also the wettability of an aluminum alloy matrix to ceramic fibers is greatly improved, a two-phase interface is effectively improved, and therefore the mechanical property of the composite material is remarkably improved, and tests show that the ZL102 aluminum alloy serves as a base material, the aluminum-based silicon carbide fibers serve as the ceramic fiber strengthening phase, the tensile strength can reach 709 MPa, and the mechanical property of the composite material is improved. And compared with a common ZL102 aluminum alloy, the aluminum alloy is improved by 443%.

The application relates to a preparation method of a multi-scale SiC particle heterostructure reinforced magnesium-based composite material, and belongs to the field of metal matrix composite materials and preparation thereof. In the application, a second phase is generated in-situ by adding rare earth elements, micron, submicron and nanoscale SiC reinforcing body particles form a heterostructure due to size difference, and after a subsequent plastic deformation process, the multi-scale reinforcing body particles form a layered distribution characteristic heterostructure, second phase strengthening, reinforcing body particle strengthening and heterostructure strengthening effects are generated, and the modulus and strength of the magnesium-based composite material are improved. Moreover, the magnesium-based composite material is prepared by using a stirring casting mode, the production process is shortened, the production cost is reduced, the magnesium-based composite material with high modulus and high strength is prepared, the application of the high-performance magnesium-based composite material is promoted, and the application range of the magnesium-based composite material in the fields of automobile industry and aerospace is expanded, which has important significance.

The present invention belongs to the field of materials and provides a fullerene ash reinforced 6013 aluminum-based composite material and a preparation method thereof, comprising: preparing a fullerene ash reinforced 6013 aluminum-based composite material by a stirring casting method, and the extruded profile having excellent mechanical properties after T6 treatment. Fullerene ash particles are an ideal reinforcing phase for metal-based composite materials and can play a good strengthening role on aluminum alloys. Fullerene ash particles have a significant inhibitory effect on the growth of α-Al grains and a significant hindering effect on the diffusion of alloying elements in the solid solution process. The mechanical performance indicators such as aging peak hardness, yield strength, and tensile strength of the fullerene ash reinforced 6013 composite material are all higher than those of the 6013 alloy. This is attributed to the strengthening and grain refinement effects of the fullerene ash.

This invention relates to the field of metal matrix composites, and more particularly to a ceramic-reinforced layered Al-based composite material, its preparation method, and its applications. The method involves combining aluminum or aluminum alloys with an aluminum-based composite material via stir casting. The resulting ceramic-reinforced layered Al-based composite material exhibits excellent mechanical properties, good heat resistance, and wear resistance, making it suitable for various components such as automotive brake discs. This invention comprehensively considers the characteristics of the stir casting process to ensure the interfacial bonding of the ceramic-reinforced layered Al-based composite material. When the ceramic reinforcement layer forms a semi-solid state, the molten base layer is slowly poured into a mold. The interface of the ceramic reinforcement layer melts instantaneously, and during the direct solidification process, the aluminum matrix between the ceramic reinforcement layer and the base layer is connected, exhibiting strong shear resistance and high effectiveness in transferring interfacial loads. This invention features low-cost equipment, a simple process, and low material production costs, enabling industrialization.

The invention discloses a preparation method of a high-performance brake disc made of a carbon fiber reinforced aluminum-based composite material, and relates to the field of composite materials. Aluminum-silicon-copper alloy is used as a matrix, carbon nanofibers are introduced, and the carbon fibers are subjected to interface pretreatment so as to enhance combination with the matrix. The brake disc is prepared through the processes of powder mixing, pre-body pressing, melt immersing and stirring, casting forming, heat treatment, machining and the like. And the prepared brake disc has the excellent performances of high hardness, good wear resistance, stable friction coefficient, high heat conductivity, long fatigue life, light weight and the like, and is particularly suitable for being applied to a brake system under a high-speed or high-load condition.

The application discloses an aluminum / carbon fiber / diamond composite material with a bonding layer generated in situ under turbulent impact, a heat dissipation sheet and a preparation method thereof, and belongs to the technical field of composite material preparation. The aluminum / carbon fiber / diamond composite material is prepared by the following steps: an AlTiSi / carbon fiber master alloy is prepared by stirring casting; the master alloy is melted and infiltrated into a mold filled with diamonds to obtain a composite material heat dissipation sheet; and high and low temperature heat treatment is carried out under atmosphere protection to obtain the final aluminum / carbon fiber / diamond composite material heat dissipation sheet. Under the combined action of in-situ reaction and turbulent impact, the carbon fiber is completely dispersed to form a uniform and fine heat conduction network. In the heat conduction network formed by the carbon material, the large-size diamond is used as the main body, and the micron-scale carbon fiber network is uniformly distributed in the gap of the diamond network. After the joint addition of Ti and Si, the interface reaction of the composite material is sufficient, the interface thermal resistance is small, and the bonding strength is high. Through the adjustment of the particle size and proportion of the diamond and the carbon fiber, a combination with better thermal conductivity and expansion coefficient can be obtained.

The invention discloses a processing method of a TC4 particle reinforced low-rare-earth magnesium-based composite board, which comprises the following steps: selecting TC4 particles as a reinforcement body, combining a stirring casting process and an asymmetric extrusion processing process, and based on the principles of temperature asymmetry, strain asymmetry and the like, introducing shear stress, constructing an asymmetric stress state in a deformation process, promoting the TC4 particles to flow in multiple directions, and forming the low-rare-earth magnesium-based composite board. The particle dispersion uniformity is improved, crystal grains are further refined, meanwhile, tilting of the crystal grains is promoted, and the basal texture is weakened; and meanwhile, according to the material design, high-plasticity magnesium alloy with low rare earth content is adopted as a matrix, and the low-rare earth magnesium-based composite material plate with the strength remarkably improved and the plasticity maintained is finally prepared through the action of activating a non-basal slip system by rare earth elements.

A method for preparing a lightweight, high thermal conductivity graphite-reinforced magnesium matrix composite material, belonging to the technical field of thermally conductive magnesium matrix composite materials, solves the technical problem of limited thermal conductivity of Mg alloys. The method includes the following steps: graphite pretreatment → Mg-5Zn magnesium alloy matrix refining → ultrasonic-assisted semi-solid stirring pressure casting → homogenization treatment → hot extrusion forming. The graphite-reinforced magnesium matrix composite material proposed in this invention is a novel high thermal conductivity lightweight composite material. All materials used are relatively inexpensive. Its stirring casting process is relatively simple and can produce large-size blocks, which is beneficial for further industrial production and application. The graphite-reinforced magnesium matrix composite rods prepared by this invention have a thermal conductivity as high as 170 W / (m·K) along the extrusion direction and a density of 1.86 g / cm³. 3 The following breakthrough in thermal conductivity was achieved while maintaining the lightweight advantage of Mg alloys.

The invention belongs to the field of metal metallurgy and high homogeneous melt preparation, and relates to a three-dimensional composite stirring casting system and method based on self-adaptive learning control, and the system comprises a furnace body which is used for smelting a metal melt; the three-phase induction coil group is axially arranged on the outer side of the furnace body in a layered manner, is connected with a multi-frequency programmable power supply, supports independent frequency, phase difference and amplitude adjustment, and is used for generating a controllable traveling wave magnetic field to realize longitudinal rolling and stirring of the melt; the permanent magnet rotating device is arranged at the bottom of the furnace body and is used for providing radial turbulent flow to form horizontal flow; the melt flow field monitoring module is used for collecting melt flow velocity and state data in real time; and the intelligent control module is used for dynamically adjusting the frequency, the phase difference and the phase sequence of the three-phase induction coil group and the rotating speed of the permanent magnet rotating device according to monitoring data so as to realize closed-loop optimization of the three-dimensional flow field. Through a multi-dimensional coupling stirring mechanism and intelligent control, the uniformity and stability in the metal smelting process are remarkably improved.