Tungsten Trioxide Main Phase During Reaction Process

Many studies have shown that tungsten powder largely depends on the final size of the tungsten oxide and reducing conditions. During the reduction process tungsten trioxide (WO3) major phase component has a great influence on the grain size of tungsten powder, to understand the  main phase ingredients of restore process in favor of to choose different raw materials and processing technology to produce different size tungsten powder (WP). After studies found that when the temperature at 500 ~ 600 ℃, the tungsten trioxide reaction occurs as WO3 → β- tungsten oxide → β-W → WP. And there are a small amount of β- tungsten oxide turn into tungsten dioxide (WO2), and then reduced to WP. When the reaction temperature is 600 ~ 800 ℃, the reaction as follow WO3 → β-tungsten oxide → dioxide, →tungsten dioxide → WP. In which a small amount of β- tungsten oxide restore to β-W and then into WP. When the temperature is 770 ~ 900 ℃, the reaction occurs as WO3 →β-tungsten oxide→ γ- tungsten oxide→tungsten dioxide→ WP. Besides after the morphological study found that tungsten trioxide is good for produce coarse particles tungsten powder, γ- tungsten oxide is suitable to obtain fine tungsten powder, β- tungsten oxide is somewhere in between.

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