Nano particle size violet tungsten oxide for ceramic microsphere may be used to produce tungsten powder. Researchers have observed the effect of violet tungsten oxide raw material on tungsten powder product. And they found that:
The morphology of violet tungsten oxide under low-magnification SEM is characterized by uneven surface of the violet tungsten oxide aggregate with many fine micropores. The morphology of violet tungsten oxide in high-magnification SEM is characterized in that the aggregates are mainly composed of acicular or columnar multi-grains with staggered distribution. These crystal grains are uneven in thickness and mutually staggered bridge structures. And the ratio of length to diameter is large. This structure causes a lot of voids inside the violet tungsten oxide aggregate. This is very beneficial for the entry of hydrogen and the volatilization of water vapor during the reduction process. The reaction can be carried out both internally and on the surface. Therefore, the reaction speed is fast, and the growth of the tungsten powder particles can be suppressed to a certain extent, so that the finally obtained tungsten powder is obtained with finer particle size.
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