The invention provides a method for preparing ultrathin metal powder and belongs to the field of material preparation. The method comprises the steps of smelting, atomization, cooling, solid-liquid separation and the like. In the step of atomization, one or more of water, nitrogen, helium and argon serves/serve as an atomizing medium. According to the method, the metal powder or alloy powder with the grain size smaller than 10 micrometers is basically obtained, the ratio of the metal powder or the alloy powder with the grain size smaller than 10 micrometers is over 50%, the sphericity of the obtained metal powder or the alloy powder is over 90%, the oxygen content is smaller than 100ppm, the gas consumption is small, the cooling efficiency is high, and the requirements for devices are low. The method for preparing the ultrathin metal powder is capable of satisfying the requirements of the metal powder or the alloy powder used for injection forming, thermal spraying, thermal spray welding and 3D printing.

Method for preparing ultrathin metal powder

Multi-stage impurity removing and refining method in production process of secondary aluminum

The invention discloses an aluminum alloy for a wheel hub and a preparation method thereof, and an aluminum alloy wheel hub. The preparation method comprises the following steps: a, melting an aluminum ingot so as to prepare a primary aluminum liquid; b, mixing a slag-clearing agent with the primary aluminum liquid, and discharging molten slag so as to prepare a second-stage aluminum liquid; c, mixing a refining agent with the second-stage aluminum liquid in the presence of nitrogen and then carrying out standing and slagging so as to prepare a third-stage aluminum liquid; d, mixing a refiner and a modifier with the third-stage aluminum liquid so as to prepare a fourth-stage aluminum liquid; E, spreading the slag-clearing agent onto the surface of the fourth-stage aluminum liquid to clear slag so as to prepare a fifth-stage aluminum liquid; and f, spreading the slag-clearing agent on the surface of the fifth-stage aluminum liquid, and carrying out degassing treatment so as to prepare the aluminum alloy for the wheel hub. According to the invention, the contents of hydrogen and impurities in the aluminum alloy for the wheel hub are low, so the aluminum alloy for the wheel hub has excellent fluidity and shrinkage during solidification; therefore, the surface of the aluminum alloy wheel hub prepared from the aluminum alloy used for the wheel hub is free of pin holes and slag holes.

Aluminum alloy for wheel hub and preparation method thereof, and aluminum alloy wheel hub

The invention relates to the technical field of coating preparation, and provides a formula and a preparation method of aluminum alloy high-temperature baking metallic paint and coating varnish of the metallic paint with such basic properties as good flexibility, adhesion, hardness, impact resistance, wearing resistance and the like, and such analog and practical long-term experimental properties as gasoline resistance, dampness resistance, water resistance, thermal resistance, acid-alkali resistance, salt mist resistance, hot water resistance and the like. The formula of metal flicking primary color paint comprises the following components: a thermosetting acrylic resin (self-made), a polyester resin (self-made) sagging additive, a wax liquid, an adherence promoter, a silane coupling agent, an adhesion promoter, an amino resin (Aminoresin), aluminum powder forming agent, aluminum powder and a diluent; the coating varnish comprises the following components: and a thermosetting acrylic resin (self-made), an acrylic resin, an amino resin, a flatting agent, an ultraviolet absorbing agent and a diluent.

Composition and preparation method of lead-free high weather resistance high corrosion resistance aluminum alloy high-temperature baking metallic paint and coating varnish

Method for remelting in-situ particle reinforced aluminum-based composite material

The invention discloses an aluminum alloy wheel hub cutting scrap recycling and smelting process and belongs to the technical field of new materials. The aluminum alloy wheel hub cutting scrap recycling and smelting process includes the following steps: (1) pretreatment: after impurity removal, drying, smashing and magnetic separation, adding cutting scraps produced in the machining process of aluminum alloy wheel hubs in an aluminum scrap recycling furnace for melting; (2) refinement: blowing a refining agent into a melting chamber through nitrogen for refining when the temperature in the furnace reaches 720-750 DEG C; (3) modification and double-refinement: adding aluminum-strontium bars and mixed rare earth in a tempering chamber for compound modification and double-refinement treatment of molten aluminum alloy entering the tempering chamber; (4) degassing: blowing nitrogen into the tempering chamber through a porous plug for degassing; and (5) filtering and deslagging: adding a fluxing medium in molten aluminum for fluxing, and adopting a foamed ceramic filter disc for purifying the molten aluminum alloy flowing to a using chamber and preserving heat for later use.

Aluminum alloy wheel hub cutting scrap recycling and smelting process

The invention discloses a method for manufacturing a hub of a high-performance cross-country recreational vehicle, comprising the following steps of: (1) material preparation: cutting an aluminum alloy rod into blanks; (2) blank cleaning: removing the surface impurities such as oil stains and the like; (3) preheating: preheating the blanks to 400-450 DEG C and preserving the temperature for 1h; (4) rough forging: pre-forging the blanks into cakes under a 800-ton forging machine; (5) mould preheating: preheating the forged moulds to about 300 DEG C; (6) placing the roughly forged blanks into a mould and forging under a 1200-ton forging machine for 2-3 times for the preliminary forming of the blanks; (7) placing the preliminarily formed blanks into a flaring machine for flaring; (8) placing the flared blanks into a horizontal spinning machine for spinning so as to obtain various generatrix-shaped hollow rotator hubs; (9) placing the spun blanks into a numerical control lathe and a processing center for machining; and (10) surface treatment.

Method for manufacturing hub of high-performance cross-country recreational vehicle

The invention discloses an aluminum alloy automobile wheel hub composite reinforcement technology. Trace elements (comprising Mg, Ti, B, RE and the like) are added on the basis of original alloy components to carry out a reasonable component optimization, and effective purification, crystal grain refinement, deterioration treatment and finished product heat treatment are carried out in the melting process to simultaneously guarantee the good casting performance and the better mechanical performances of the alloy. The tensile strength, the yield strength and the elongation rate of aluminum alloy wheel hub products produced through utilizing the technology reach 262MPa, 179MPa and 9% respectively, and exceed strength performance standards in the Chinese wheel hub industry, so the technology has the advantages of certain practical production meaning, heat treatment period shortening, and substantial saving of the production cost.

Aluminum alloy automobile wheel hub composite reinforcement technology

The invention relates to a high-toughness lightweight alloy material used for automobile hubs and a preparation method thereof, and belongs to the field of new materials The formula of the alloy material is as follows: 6-8% of Si, 05-1% of Mg, 003-02% of Cu, 03-04% of Mn, 005-03% of Ti, 002-004% of Ni, 002-005% of Sr, 002-015% of La, 001-01% of Ce, and the balance being Al The preparation method comprises the steps of purification, deterioration, refinement, degasification, slag removal, etc The prepared material is uniform in alloy components, and can significantly enhance the tensile strength of the material A casting member has good internal quality and uniform and fine organizations, has no macroscopic casting defects of shrinkage porosity, shrinkage cavity, slag inclusion and the like on cracking surfaces, and can significantly increases the hardness, tensile strength and elongation percentage of the aluminium alloy hubs

High-toughness lightweight alloy material used for automobile hubs and preparation method thereof

The invention relates to a modification refining process for casting aluminium alloy, and belongs to the technical field of new materials. Gases and impurities can be removed effectively from a casting aluminium alloy solution, by using a refining agent and through a plurality of melting processes comprising slag removal, refining, modification, grain refinement, degassing, filtration to remove slag, etc. Pure degree of the casting aluminium alloy solution is increased; and modification and refining effects are significant. The process can not only decrease alloy getter but also improve the fluidity of the aluminium alloy solution, reduces a series of casting defects such as cracks, cold shuts, slag holes, shrinkages and the like which are easily produced in the casting process of aluminium alloy products, and improves the mechanical properties of the casting products by the aluminium alloy solution.

Zhao Kaizhi

Papers

Aluminum alloy wheel hub cutting scrap recycling and smelting process

Method for manufacturing hub of high-performance cross-country recreational vehicle

Aluminum alloy automobile wheel hub composite reinforcement technology

High-toughness lightweight alloy material used for automobile hubs and preparation method thereof

Modification refining process for casting aluminium alloy