69 results about "Stir casting" patented technology

The invention relates to a graphene enhanced magnesium-based composite and a preparing method thereof, and belongs to the technical field of composites. In the inert atmosphere, graphene with a certain lamella size and pure magnesium particles are subjected to ball-milling treatment, and meanwhile peeling of a graphene lamella and mixing between the graphene lamella and the pure magnesium particles are achieved; an ultrasonic dispersing and mechanical stirring technology is adopted, the peeled graphene lamella is further dispersed in a liquid phase, the pure magnesium particles are inserted in the parts among graphene layers in the stirring process, and the solid phase interval and sufficient mixing between the pure magnesium particles and the graphene layers are achieved; the compactness of graphene/pure magnesium particle composite powder is enhanced through a thermal extrusion technology, a magnesium-based precursor containing graphene is obtained, and the graphene enhanced magnesium-based composite is finally obtained through an alloy component blending and stirring casting method. The method technology is simple and convenient to conduct, environment friendliness is achieved, and sufficient dispersing of graphene in a magnesium base body is achieved. The graphene/magnesium-based composite with the enhanced mechanical performance is obtained, and wide application prospects are achieved in the fields such as aerospace, automobiles and electronics.

The invention relates to the technical field of a brake disc and particularly relates to a preparation method for a silicon carbide/aluminium alloy composite material for a brake disc. The technical scheme of the preparation method is as follows: aluminium casting alloy ZAlSi8MgBe is selected and used as matrix alloy, alpha-SiC particles are selected and used as silicon carbide, and the preparation method comprises the following specific steps of: (1) reshaping of the SiC particles; (2) chlorohydric acid pickling; (3) high-temperature oxidation; (4) nitrate sensitization; (5) stir casting; and (6) T6 thermal treatment. The silicon carbide/aluminium alloy composite material prepared by the invention has the advantages of light weight, high specific strength and specific stiffness, low coefficient of thermal expansion, good thermal conductivity and wear-resistant abrasive resistance, more easiness in preparation and low cost; and the reinforced phases of the silicon carbide/aluminium alloy composite material are dispersively distributed in the matrix and have isotropy so that the silicon carbide/aluminium alloy composite material is suitable for various complex stress states.

The invention discloses a graphene and reaction in-situ nano magnesium oxide particle composite enhanced magnesium-based composite material and a preparing method thereof, relates to a graphene enhanced magnesium-based composite material and a preparing method thereof, and aims at solving the problems that in existing composite materials, graphene and magnesium matrix wettability is poor, graphenedispersibility is poor, and the interface bonding strength is low. The composite material is prepared through three raw materials including oxide, graphene and a magnesium matrix. The method comprises the steps that firstly, stirring casting or powder metallurgy is conducted; and secondly, heat deformation is conducted, and a cast-state composite material or a sintered-state composite material issubjected to hot extrusion or rolling deformation. The interface position of the composite material prepared through the method is free of holes and impure phases, graphene and matrix wettability isgood, and the interface interaction between graphene and a matrix is high. The graphene and reaction in-situ nano magnesium oxide particle composite enhanced magnesium-based composite material and thepreparing method thereof are used in the magnesium-based composite material field.

The invention relates to the technical field of preparation of rare metal materials, and concretely relates to a method for preparing a SiCp/Al composite material. The method for preparing the SiCp/Al composite material comprises the following steps: 1, preparing SiC-Al composite powder: filing a ball milling pot with SiC powder and Al powder, and carrying out ball milling according to a ball to powder ratio of 20:1 to obtain the SiC-Al composite powder; and 2, preparing a cast body: heating pure aluminum ingots to melt the pure aluminum ingots, degassing the molten pure aluminum ingots, removing slag from the degassed molten pure aluminum ingots, adding the ball-milled composite powder, stirring above materials, heating the obtained mixture to 700DEG C, and carrying out cast molding 20min later. The method for preparing high-performance composite powder by adopting a powder metallurgy technology avoids the problems of poor wettability of a reinforcement material and a matrix and poor dispersibility of ultrafine particles of traditional stirring dispersion methods by uniformly dispersing silicon carbide ultra-micro fine particles difficultly uniformly dispersed in aluminum melt in large aluminum particles, and is in favor of displaying the advantages of low cost and shape diversification of the prepared material of stirring casting methods.

The invention discloses a method for casting an aluminum-base composite material by adding ceramic nanoparticles. The method comprises the following steps: premixing SiO2 and Al in a mass ratio of 1:5 or TiO2 and Al in a mass ratio of 1:3, carrying out ball milling uniformly to obtain a mixture, rolling the mixture and a pretreated pure aluminum plate with the thickness of 0.5mm in a mass ratio of 1:8 or 1:12 by using a dual-roll mill, and finally, preparing the aluminum-base nano composite material by a stirring casting process. The aluminum-base nano composite material effectively improves the problems of wettability and dispersity between the ceramic nanoparticles and aluminum alloy melt. The aluminum-base nano composite material has excellent comprehensive mechanical properties: the yield strength, tensile strength and elongation percentage of the SiO2/Al-7Si-0.3Mg are respectively enhanced by 18.8%, 19.1% and 90.7% as compared with the as-cast Al-7Si-0.3Mg alloy; and the yield strength, tensile strength and elongation percentage of the TiO2/Al-7Si-0.3Mg are respectively enhanced by 15.3%, 17.4% and 58.1% as compared with the Al-7Si-0.3Mg alloy.

The invention discloses a metallic titanium particle reinforced magnesium-based composite material and a vacuum stirring casting method and application thereof, and relates to the field of magnesium alloys. The vacuum stirring casting method comprises the steps that carbon dioxide and sulfur hexafluoride mixed protective gas is introduced into vacuum stirring casting equipment, then the magnesium alloys are heated and melted, preheated metal titanium particles are added, uniform stirring is conducted, and then casting forming is conducted. According to the vacuum stirring casting method of the metallic titanium particle reinforced magnesium-based composite material, the scientific problem that a traditional inorganic non-metal ceramic reinforced magnesium-based composite material has high strength and high modulus, but has low plasticity and high brittleness and the technical problems of high cost and high possibility of oxide inclusion existing in a conventional stirring casting and powder metallurgy method for preparing the composite material are solved, so that the metallic titanium particle reinforced magnesium-based composite material with low cost, low oxide inclusion and excellent comprehensive mechanical properties is prepared. The metallic titanium particle reinforced magnesium-based composite material can be widely applied to 3C electronic products and parts for transportation or aerospace.

A method for manufacturing carbon fiber reinforced aluminum composites is provided. Particularly, the method uses a stir casting process during a melting and casting process and reduces a contact angle of carbon against aluminum by inputting carbon fibers while supplying a current to liquid aluminum to induce the carbon fibers to be spontaneously and uniformly distributed in the liquid aluminum and inhibits a formation of an aluminum carbide (Al₄C₃) phase on an interface between the aluminum and the carbon fiber, thereby manufacturing carbon fiber reinforced aluminum composites having excellent electrical, thermal and mechanical characteristics.

The invention provides a method for preparing an enhanced Mg-based composite material by using graphite particles, relates to a method for preparing an enhanced Mg-based composite material, and aims to solve the technical problem that the existing Mg-based composite material does not has high thermal conductivity performance or high damping performance. The preparation method comprises the following steps: 1, preparing semi-solid molten magnesium alloy; 2, preparing a graphite- alloy melt; 3, preparing the enhanced Mg-based composite material by using the graphite particles. According to the enhanced Mg-based composite material by using the graphite particles, the effect that the graphite particles can improve the thermal conductivity performance and the damping performance of the composite material is fully played through stirring casting and control of the volume fraction of the graphite particles, so that the Mg-based composite material with high thermal conductivity performance and high damping performance is obtained. The method is mainly used for preparing the Mg-based composite material.

The invention relates to a preparation method of an in situ synthesized MgO reinforced Mg-based composite material. The preparation method comprises the following steps: 1, melting Mg alloy and heating the Mg alloy to 850-900DEG C under the protect of an inert gas, and keeping the temperature in the subsequent blowing process; 2, blowing SrO powder into the obtained Mg alloy melt, cooling the Mg alloy melt to 700-720DEG C after finishing the temperature keeping blowing, keeping the temperature, and stirring the obtained alloy melt by a graphite rod for 20-40min according to a stirring rate of 200-1000rpm; and 3, removing scum from the surface after stirring, casting in a metal die, and allowing to solidify to obtain the in situ synthesized MgO reinforced Mg-based composite material. According to the invention, above stirring casting process is combined with above in situ reaction process, so the MgO reinforced Mg-based composite material is prepared through the simple in situ synthesis without changing original stirring and casting devices and the original technological flow; the prepared Mg-based composite material has good mechanical and physical properties; and problems of relatively complex operations and easily caused material oxidation and pollution of original methods are avoided.

The invention discloses a preparation technology of a discontinuously reinforced aluminum matrix composite (DRA) thin-wall tube, and belongs to the technical field of the preparation of aluminum matrix composites; according to the technology, a powder metallurgy or stir casting method is used for preparing a DRA billet, and a hot extrusion method is used for preparing a DRA tube blank, and after annealing treatment, the tube blank is put on a bi-roller or multi-roller rolling mill for cold rolling, and the annealing treatment is performed between every two times of cold rolling until the tube is rolled to a required size. After cold rolling, by solid solution treatment and aging treatment of DRA capable of being reinforced by heat treatment, a seamless tube with good performances can be obtained.

The invention relates to a preparation method of a graphene aluminum composite material. The method comprises the following steps: providing graphene aerogel, and forming an aluminum film on the surface of the graphene aerogel by a vacuum evaporation method; stirring the graphene aerogel with an aluminum film formed on the surface to obtain graphene powder with the aluminum film formed on the surface; and compounding the graphene powder with the aluminum film formed on the surface with an aluminum matrix by adopting a stirring casting method. The invention further relates to the graphene aluminum composite material and a cable or an electric wire comprising the graphene aluminum composite material.

The invention discloses a preparation method of a SiC particle reinforced 2024 aluminum-based composite material plate, and relates to a preparation method of a 2024 aluminum-based composite materialplate. The preparation method aims to solve the technical problems that an existing particle reinforced aluminum-based composite material plate is high in production cost and difficult to realize batch production. The preparation method comprises the following steps of 1, preparing a SiC particle reinforced 2024 aluminum-based composite material; 2, carrying out hot extrusion; and 3, carrying outhot rolling. The SiC particle reinforced 2024 aluminum-based composite material thin plate obtained through stirring casting, extrusion and rolling has excellent mechanical properties, and has the advantages of being low in equipment cost, simple to operate and capable of being produced in a large scale.

A preparation process for a forge piece of a discontinuous reinforcement aluminum-based composite is characterized in that through a hot extrusion method, a rodlike or rectangular forging stock is prepared from a composite billet prepared through a powder metallurgy or stir casting method; during extrusion, the extrusion temperature and speed are controlled, and thus the microstructure of an extrusion material (forging stock) is controlled; and the structure and performance of the forge piece are controlled by controlling the temperature, the deformation rate and the final forging temperature of free forging. Through the preparation process, single-pass forging and pressing deformation can be improved, forging cracks are reduced, thus the forging efficiency and yield are improved substantially, and products of different shapes can be obtained through forging. Compared with an isothermal die forging commonly used for difficult-to-form metal, the preparation process for the forge piece of the discontinuous reinforcement aluminum-based composite is lower in cost and wide in application range.

The invention provides a high-strength high-conductivity Cu-Ag-Sc alloy and a preparation method thereof, discloses a method for introducing a silicon carbide particle strengthening phase by designinga composite material middle layer to improve a Mg/Al layer interface, and relates to a preparation method of an aluminum/aluminum-based composite material/magnesium/aluminum-based composite material/aluminum layered material for improving the performance of the magnesium/aluminum interface. The method comprises the steps that firstly, a SiCp strengthened aluminum-based composite material of whichparticles are evenly distributed is prepared by adopting a semi-solid-state stirring casting method, then hot rolling is conducted, and an aluminum-based composite material component plate with the excellent matrix grain refinement performance is obtained; and secondly, hot pressing and annealing are conducted on metal laminated plates stacked according to the aluminum/aluminum-based composite material/magnesium/aluminum-based composite material/aluminum order. According to the method, on the one hand, the dispersion strengthening effect and the fine grain strengthening effect are generated on component layer metal; and on the other hand, the toughness of the interface area is improved, and the comprehensive performance of the composite plate can be significantly improved.

The invention relates to the technical field of cement products, in particular to a preparing method of the cement products. The method comprises the steps of firstly, stirring casting, secondly, primary maintenance, thirdly, secondary maintenance, fourthly, natural molding and fifthly high-temperature calcination; in the primary maintenance stage, microwave radiationcrowave radiation is used for promoting solidification, in the primary maintenance stage and the secondary maintenance stage, a reinforcing agent is sprayed, and pores in the interiors and the surfaces of the cement products can be filled with the agent; through the method, the solidification time of the cement products can be shortened, the obtained cement products have high strength and do not lose roughness, no pores exists, the surfaces are flat and free of sand holes, the whole quality is good, practicability is good, and the method can be suitable for being applied in the field.

The invention discloses a preparation method for a cast soluble magnesium alloy composite fracturing ball surface protection layer, and belongs to the field of unconventional oil and gas equipment manufacturing. A cast floating bead-magnesium alloy soluble composite fracturing ball is prepared by adopting a stir casting method, wherein the fracturing ball is prepared from, by mass, 6%-8% of floating beads, 12%-15% of Al, 1%-3% of Zn, 0.5%-0.8% of Cu, 0.5%-1% of Ni and the balance Mg; the soluble composite fracturing ball blank is subjected to cutting machining by adopting a numerical control machine tool, a Mitsubishi numerical control blade, a dry cutting mode and optimized cutting process parameters; the surface of the machined fracturing ball is subjected to micro-arc oxidation processing by adopting a mixed aqueous solution of Na2SiO3 and KOH as an electrolyte solution and by adopting optimized process parameters; and the fracturing ball obtained after micro-arc oxidation processing is subjected to soaking processing by adopting a (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane-isopropanol fluorination processing mixed solution with the volume fraction of 1% to enable thesurface to achieve a hydrophobic function. The preparation method for the soluble fracturing ball surface protection layer is simple in process and suitable for industrial production.

The invention discloses a light high-strength boron carbide particle reinforced aluminum-based composite material and a preparation method thereof. The light high-strength boron carbide particle reinforced aluminum-based composite material is prepared from the following components in percentage by mass: 8-30% of boron carbide (B4C) particles and 70-92% of an aluminum alloy matrix. The preparation method comprises the steps that copper plating treatment is carried out on the surfaces of the boron carbide particles; the solid aluminum alloy matrix is molten; the treated boron carbide particles are added into the molten aluminum alloy matrix, and are mechanically stirred to uniformly disperse the particles; and the composite material is obtained through casting, hot extrusion and heat treatment. The surfaces of the boron carbide particles are subjected to copper plating treatment, interface reaction is regulated and controlled, the boron carbide particles are prevented from being directly in contact with molten aluminum alloy to be corroded, the composite material is obtained through a stirring casting method, the obtained material is excellent in performance, the preparation method is simple, the cost is low, and industrial production can be achieved.

The invention discloses an electromagnetic multi-cyclone stirring and casting device and relates to the technical field of casting. The electromagnetic multi-cyclone stirring and casting device comprises a water tank; a crystallizer is installed inside the water tank; an electromagnetic device body is installed outside the crystallizer; the electromagnetic device body comprises fixed rods; and themultiple fixed rods are commonly provided and are divided into a plurality of groups. According to the electromagnetic multi-cyclone stirring and casting device, by changing the direction and the strength of a magnetic field, the stirring direction and the stirring strength of molten liquid can be effectively adjusted, the flowing form and the flowing speed of the molten liquid are controlled, the temperature distribution of the molten liquid in the crystallizer is uniform, the uneven thickness of an initial solidified blank shell is inhibited, the delayed solidification and blank shell deformation are reduced, the device has an obvious effect on improving the quality of a continuous casting blank, due to the facts that grains are refined, structures are uniformly distributed, the volumeshrinkage is reduced and the hot cracking tendency is reduced, the shrinkage porosity tendency is basically eliminated, and the mechanical properties of castings are greatly improved.

The invention discloses a preparation method for improving the segregation and structure uniformity of zirconium-containing magnesium-based alloy elements, and belongs to the technical field of magnesium-based alloy preparation. This method mainly uses the steps of press crushing, ball milling, vibrating screen, sand milling, composite ball milling, and cold pressing into a prefabricated body to homogenize the zirconium particles in the magnesium-zirconium master alloy for secondary redistribution and greatly reduce the particle size of the zirconium particles. The size is 1 μm or less, which is added to the magnesium alloy melt, and the zirconium-containing magnesium-based alloy is prepared by a stirring casting method. The preparation method provided by the invention greatly reduces the unmelted zirconium particles in the magnesium alloy ingot, greatly reduces the segregation degree of the Zr element, makes the grain structure more uniform, reduces the difference in mechanical properties between the zirconium-rich region and the zirconium-poor region, and can obtain High-quality zirconium-containing magnesium alloy ingots facilitate the control of the amount of zirconium used in industrial production and reduce the cost of use.

The invention belongs to the technical field of titanium alloy composite metal preparation, particularly relates to a preparation method for metal injection molding of a titanium alloy composite material, and provides the following scheme now to solve the problems that traditional titanium alloy metal materials are mainly subjected to die casting, stirring casting and other methods, but the methods are generally complex in process equipment, high in cost and poor in preparation quality. The preparation method comprises the following preparation steps that S1, raw materials are prepared and treated; S2, the raw materials are preheated and mixed; S3, smelting and impurity removal are performed; S4, injection molding is performed; S5, cooling and demolding are performed; S6, shape machining is performed; and S7, performance detection is performed; the raw materials in S1 include titanium powder, a binder, boron carbide powder, aluminum powder, magnesium powder, copper powder, nickel powder, carbon fiber powder and a modifier. The preparation method is easy and convenient to operate, adopts an injection mode, can realize integral forming, and reduces the preparation difficulty; various metals and fibers are added during preparation, so that the strength and toughness of the composite material can be improved.