The Reduction Process Fromγ-Tungsten Oxide To Tungsten Powder

The process of blue tungsten oxide restore to tungsten powder that the primary phase composition is β- tungsten oxide (WO2.9), γ- tungsten oxide (WO2.72), tungsten dioxide (WO2) and tungsten powder in this process. During reduction process which is from blue tungsten to γ-tungsten oxide, γ- tungsten oxide particle surface becomes rougher, rod-shaped and needle-like shape and irregular arrangement. This form is conduct to facilitate the reaction and to obtain fine tungsten powder. With the further reduction the γ- tungsten oxide transformed into tungsten oxide, and tungsten dioxide particles become denser, shaped like tungsten powder particle morphology. In this process, if works can control the process conditions well, may be can preparing fine or ultrafine tungsten powder by γ- tungsten oxide. In the final stage reduction process of tungsten powder, tungsten dioxide reduction to tungsten powders and the morphology of tungsten powder which is not very different with tungsten dioxide. Where is a tungsten dioxide grains turn into a tungsten powder grains. Therefore, the morphology changing is mainly prior to tungsten dioxide generated. In order to produce good performance and fine tungsten powder well control the technology conditions before generated tungsten dioxide is very important. 
 

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