Nano particle size violet tungsten oxide for thermal insulation masterbatch can be used to prepare tungsten powder. The violet tungsten oxide powder is reduced to obtain W powder. In this process, the original needle-like or columnar crystal grains of violet tungsten oxide have been melted to form short rods, or a chain composed of a plurality of single crystal particles. The grain size is relatively uniform, and the particle size is at the range of 0.1~1μm.
That is to say, the appearance of the powder particles does not change much throughout the reduction process. While the microscopic volume of the particles is contracted because hydrogen deprives oxygen. The obtained tungsten powder particles are uniform and distributed, which is beneficial to the next step --- carbonization.
It can be seen that the violet tungsten oxide is suitable for the production of ultrafine tungsten powder. Moreover, the tungsten carbide powder prepared by using violet tungsten oxide as raw material has small particle size, uniformity, narrow particle size distribution, and no structural aggregate group. Therefore, ultrafine tungsten carbide with high strength, high hardness and small WC grain size can be prepared by using violet tungsten oxide as a raw material.
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