Nano blue tungsten oxide for thermal insulation thin film can be used to produce fine grain size tungsten powder. And it is reported that blue tungsten oxide is the most widely used raw material for preparing tungsten powder. When tungsten powder is prepared by hydrogen reduction method using blue tungsten oxide as a raw material, the change of particle size of tungsten powder is mainly related to the following factors, including reduction temperature, reduction time, loading amount, hydrogen flow rate, degree of dryness of furnace atmosphere, and so on.
Before blue tungsten oxide was used to prepare fine tungsten powder, researchers recommended tungstic acid. Although tungstic acid is suitable for production of fine tungsten powder due to its fine and uniform particle size, the production cost is relatively expensive because of its high purity. After that, researchers were searching the most suitable material for producing ultrafine tungsten powder. And it was found that blue tungsten oxide is a suitable material for preparing fine tungsten powder after the efforts of researchers.
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