Device and method for preparing spherical metal powder

Abstract

The invention belongs to the technical field of powder metallurgy, and particularly relates to a device and method for preparing spherical metal powder. The device comprises a metal bar, at least one plasma gun and a rotating disk; the metal bar is arranged in the center of the top of a furnace for preparing powder; the plasma guns are arranged around the metal bar, and predetermined angles are formed between the plasma guns and the metal bar; the rotating disk is arranged under the metal bar; the furnace for preparing the powder is filled with inert gas. According to the preparation method, plasma arcs generated by the plasma guns are adopted to melt the metal bar, generated metal droplets fall on the rotating disk rotating at a high speed, the metal droplets are thrown out and scattered through centrifugal force, and the metal powder with the fine particle size is formed after the metal droplets are cooled. According to the device and method for preparing the spherical metal powder, the structure is simple, the running cost and energy consumption are low, and the spherical metal powder prepared through the method is high in degree of sphericity, fine in particle size and high in purity.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a device and method for preparing spherical metal powder. Background technique [0002] High-quality spherical metal powder is an important raw material necessary for the production fields of powder metallurgy near net shape, injection molding, thermal spraying, 3D printing and electronic packaging, and is an important basis for the quality of the final product. With the rapid development of injection molding, thermal spraying, 3D printing and other technologies, the performance requirements for the particle size, purity and shape of metal powder raw materials in the above fields have gradually increased, and the powder preparation has been promoted to high purity, narrow particle size distribution and Development in the direction of low cost. [0003] At present, the preparation of spherical metal powder mainly adopts atomization technology, including gas ...

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Problems solved by technology

[0004] Among them, gas atomization uses high-speed airflow to break the liquid metal flow into small liquid droplets and solidify into powder. However, the metal powder prepared by gas atomization has a wide particle size distribution, and there are many hollow powders and satellite particles. The equipment is huge. Large gas consumption and high production cost

[0005] The centrifugal atomization method is to use the centrifugal force generated by the rotation to throw out the molten liquid droplets and condense them to obtain a spherical powder. There are mainly plasma rotating electrode atomization and rotating disc atomization powder making technologies. The front end of the high-speed rotating metal rod melts, and then rely on the centrifugal force of the high-speed rotation of the metal rod to throw out the molten droplets, and atomize and cool it into powder. Due to the limitation of the speed of the metal rod, the metal powder prepared by this technology has a relatively coarse particle size, generally More than 100μm; the rotating disk atomization powder making technology is to pour the molten metal droplets onto the high-speed rotating disk, and then use the high-speed rotating disk to generate centrifugal force to throw off the metal droplets and atomize the powder, but in this technology First of all, the molten metal flow must be prepared. At present, induction melting is mostly used to obtain molten metal, which consumes a lot of energy and is mostly used to prepare low-melting point metal powder.

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