Violet Tungsten Oxide Microstructure Influence Tungsten Powder and Tungsten Carbide Powder

Violet tungsten oxide observed its morphology characterized by low magnification SEM found: violet tungsten oxide surface aggregates is not flat, there are a lot of small pores. On the other hand observed in high-powered SEM found, the aggregates mainly composed of needle-like or columnar grains with scattered distribution. These grains thickness are uneven and length, diameter rate larger than normal which is scattered bypass structure and this structure makes violet tungsten oxide aggregate has many voids inside, which is good for hydrogen get into particle and water volatize. And reduction process can happens at interior as well as surface of violet tungsten oxide then the reaction speed increased, and also can inhibit tungsten powder particles grow up.  The most important tungsten powder particle size is smaller and uniform.

Violet tungsten oxide is reduced to tungsten powder, its original acicular or columnar grains have fused into a short rod, or a chain formed by a plurality of single crystal particles which are more uniform and particle size between 0.1 ~ 1um. That is, the appearance of powder didn’t changes a lot during restoration process. It just deprived oxygen by hydrogen so that the particles microscopic volume shrinks. Tungsten powder grains are uniform and scattered distribution which is conducive to the next step of carbonization.

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