Violet Tungsten Oxide Producing Refine Tungsten Powder

Tungsten powder not only widely used in the carbide producing, but also is the main raw material for tungsten-based alloy. In order to improve the material performance so that it can produce more excellent performance products, refined powder will be a trend to improve material performance.  Violet tungsten oxide surface cracks is rich, and is composed of loose needle or rod-like particles which making violet tungsten oxide has good air permeability. On one hand it is good for hydrogen reaction start with particle surface as well particles interior, thereby increasing the nucleation rate reduction. On the other hand, it is conducive to discharge water vapor which produces at the reduction process, to avoid form tungsten oxide hydrate --WO2 (OH) 2. WO2 (OH) 2 can cause chemical vapor transport leading to the tungsten powder particle size enlargement.

Tungsten powder particle size is influenced by the amount of loading the boat and hydrogen flow significantly smaller which is produced by violet tungsten oxide. Thus, when suing violet tungsten powder producing refine tungsten powder can be appropriate to increase its installed capacity boat, which reflects its advantages in productivity. And violet tungsten oxide has single phase composition so the tungsten powder particle size which is obtained from violet is small and uniform, narrow particle size distribution, the more important is unstructured gathering clumps.

So violet tungsten oxide compared to other tungsten oxide is more suitable for the producing refine tungsten powder. violet tungsten oxide at a temperature of 650 ~ 800 ℃ for 3 hours to produce refine tungsten powder the average particle size is only 0.08um, and tungsten powder is relatively uniform and well dispersed.

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