Reaction Process form Tungsten Dioxide to Tungsten Powder

In process of tungsten dioxide restore to tungsten powder, with the development of reduction, the oxygen atom of tungsten dioxide further reduce so the oxygen vacancies increase. After studies shown which will make tungsten powder particles denser than normal. However, the tungsten dioxide particle morphology and tungsten powder particle size changed little, which is almost no change. It just from a tungsten dioxide crystal grain turn into a tungsten powder grain, but in this process the tungsten powder has tendency to grow up. Therefore, the appearance of tungsten powder change occurs mainly before tungsten dioxide producing. Tungsten dioxide is not the main factor determining the tungsten powder particle size. So the key to producing ultra-fine tungsten powder is to control the reduction process conditions before tungsten dioxide restore to tungsten powder, such as low dew point of hydrogen, flow rate, amount of loading the boat.

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