Blue tungsten oxide WO2.90 was prepared by reduclion of nanosclae WO3 at 500℃ for 40 min in hydrogen. Subsequently, the resulted blue tungsten oxide was reduced at a series of temperatures for 60 min to get tungsten powders.

 

The average particle size of tungsten powder reduced at 720℃ is 19 nm, which is much less than that of conventional tungsten powder. The particle size of tungsten powder increases with increasing the reduction temperature. In addition, the tungsten powder reduced at 680℃ is so fine that it self-ignited after taken out from the reduction furnace. Nanoscale tungsten powders reduced at 720℃ and 780℃ keep stable in the air. Therefore, 680℃ can not be applied as a reduction temperature. The nanoscale tungsten powder should be stored in vacuum bags or bags filled with inert gas.

 

 

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