Device and method for preparing superfine spherical metal powder by dropwise centrifugal atomization method

Abstract

The invention provides a device and method for preparing superfine spherical metal powder by a dropwise centrifugal atomization method. The device comprises a shell body, a crucible and a powder collection area. The crucible and the powder collection area are arranged in the shell body. The device is characterized in that a rotating disc arranged in the powder collection area is of a mosaic structure, a material with poor thermal conductivity is selected as the base body part of the rotating disc, metal materials which have a wetting angle with a drop being less than 90 degrees are selected tobe inlaid in a main body part to serve as an atomization surface of the rotating disc, and a ventilating hole is formed in the rotating disc. The method for preparing the superfine spherical metal powder through the dropwise centrifugal atomization method is disclosed, a uniform droplet injection method and the centrifugal atomization method are mainly combined, a traditional metal division pattern is broken, molten metal shows fibrous division so that the superfine spherical metal powder which has a narrow distribution section of a grain size, high sphericity, good liquidity, good spreadingability, an uniform and controllable size and no satellite droplet can be efficiently prepared, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of ultrafine spherical microparticles, and in particular relates to a device and method for preparing ultrafine spherical metal powder by a droplet-by-droplet centrifugal atomization method. Background technique [0002] Metal additive manufacturing technology has been widely used in many fields such as energy and military due to its wide range of forming and the ability to process parts of various complex shapes. The spherical metal powder is used as the raw material for molding, and its quality has a great influence on the quality of the finished product. The requirements of metal powder for additive manufacturing technology include narrow particle size distribution, low oxygen content, high sphericity, average particle size less than 50 μm, and no satellite droplets. However, the quality of metal powders currently on the Chinese market is not high, and there is a large gap with foreign tec...

AI Technical Summary

Problems solved by technology

Although the powder making efficiency of the atomization method is very high, the size dispersion of the prepared powder is large, and the powder that meets the particle size requirements must be obtained through multiple screenings, which greatly reduces the production efficiency, especially when there are strict requirements on the size; atomization The method is easy to produce satellite droplets, which make the surface of the powder adhere to the satellite droplets, reduce the fluidity and spreadability of the powder, and are easy to be mixed with magazines during the production process, which cannot meet the requirements of 3D printing powder.

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