Blue tungsten oxide may be used not only for the production of thermal insulation thin film, but also for the preparation of ultrafine tungsten powder. For example, blue tungsten oxide powder can be used to prepare ultrafine W powder by hydrogen reduction method. Some scholars have studied the producing process of ultrafine tungsten powder using blue tungsten oxide powder as a raw material. They mainly studied the effects of loading capacity, reduction temperature and hydrogen flow rate on the particle size of W powder, and found that:
1.0 The amount of loading should be appropriately reduced if the conditions permit, and the thickness of the layer should be shallow.
2.0 At a lower reduction temperature, the temperature rise process is gentle, and ultrafine tungsten powder can be completely prepared. The higher the reduction temperature, the coarser the tungsten powder particles, which indicates that the reduction temperature is a key factor for producing ultrafine tungsten powder.
3.0 Using hydrogen with less humid and appropriate increase in hydrogen flow, as permitted by other processes, is another important factor for preparing ultrafine W powder.
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