Sub-micron tungsten powder

Sub-micron tungsten powder is obtained through oxidation twice and reduction three times. The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). Violet tungsten oxide (VTO) is prepared with ammonium paratungstate (APT) in the argon gas. Tungsten powder is obtained with VTO through deoxidation in the hydrogen gas (Rate of purity: 99.99%, dew point: -40°C), and tungsten powders are oxidized in the air. Tungsten oxide WO3 is reduced into tungsten powders in hydrogen gas again. The routes are repeated. The volume percent content of submicron tungsten powder between 0.1 μm and 1.0 μm is 95.73 %.

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