Tungsten metal with high melting point and high hardness is an important strategic material, which is widely used in the fields of tungsten carbide cutting tool, electric filament, tool steel additive, rocket, space aircraft, nuclear reactor, etc. With the development of science and technology, new special requirements have been put forward for raw tungsten powder. Spherical tungsten powder is required for electronic and filtration materials.
The grain size of tungsten powder used in the production of cemented carbides has been changing in a more and more small direction in recent 20 years. At the same time, as a result of the tungsten powder morphology will also have a great impact on the tungsten material performance, compact rules of spherical tungsten powder, not only good liquidity, and bulk density, sintering narrow, can obtain ideal microstructure of tungsten materials, making people interested in tungsten powder morphology control research is on the increase, the preparation of spherical tungsten powder has become an important direction of tungsten powder research.
With the rapid development of 3D printing technology, porous materials, high-density powder spraying and injection molding, the demand for high-quality spherical tungsten powder is increasing. High quality spherical tungsten powder not only has good fluidity, good sphericity, high bulk density and vibration density, but also has low oxygen content. In recent years, China's powder metallurgy technology has been improving, but there is still a big gap compared with foreign advanced technology. The production and preparation technology of high quality spherical tungsten powder in foreign countries are relatively perfect and have achieved industrial production. However, the technology and process of preparing spherical tungsten powder in China have many disadvantages and are in the stage of small batch research and development.
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