Ultrafine tungsten powder produced from different phase tungsten oxides by hydrogen reduction techniques

In this article five kinds of tungsten oxide materials of hydrogentungsten bronze (H 0.33 WO 3),ammonium tungsten bronze((NH 4) 0.5 WO 3),violent tungsten γ oxide (WO 2.72 ),tungstenyellow oxide(WO 3), mixtureof tungsten β oxideandtungsten γ oxide were selected to study the influence of raw materials on producing ultrafine and homogenous tungsten powder. Researching results show that ultrafine and homogenous tungsten powder can be produced from one phase tungsten oxide; and because of the special pore structure among WO 2.72 particles, the homogenous and ultrafine tungsten powder has loose structure which is more suitable for the ultrafine hard metals than the powders from the other TBO materials selected in this paper.[