Ammonium Paratungstate Preparing Submicron Spherical Tungsten Powder Process

Ammonium paratungstate preparing submicron spherical tungsten powder process: Violet tungsten oxide is prepared with pure ammonium paratungstate in argon gas. Tungsten powder is obtained from violet tungsten oxide through deoxidation in hydrogen gas (rate of purity:99.99%, dew point: -40℃), and tungsten powder is oxidized in the air. Tungsten oxide is reduced to tungsten powder in hydrogen gas. The samples are characterized with the laser particle size distribution measuring instrument and the electron probe scan instrument.

The results show that submicron tungsten powder can be obtained through circulatory oxidation twice and reduction three times. The percentage of the particle size distribution of submicron spherical tungsten powder is 95.73% between 0.1um and 1.0um, and its BET is 1.082 m2/g.




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