Blue Tungsten Oxide Cycle Redox Method Influence Tungsten Powder Particle Size

Tungsten powder is an important raw material for cemented carbide making. The large crystal grain size will cause cracks or breakage during use carbide. The large crystal grain size is mainly crease by coarse tungsten powder particles.

Therefore, in order to improve the performance of cemented carbide tungsten powder producing becomes very important process. Tungsten powder for the preparation becomes even more important. Blue tungsten oxide producing tungsten powder continues to mature, and is widely used in industry. Currently circulating reducing blue tungsten oxide method to control tungsten powder particle size has been widespread concern.

Firstly blue tungsten obtained from calcine extra virgin ammonium paratungstic in argon, and then after that we found the blue tungsten oxide particle size distribution uneven and also there has large cracks on the practical, but the cracks in favor of hydrogen into the interior of blue tungsten and make reduction which provides favorable conditions for refine tungsten powder particle size. The first time for Blue tungsten oxide reduction we cam obtain tungsten powder particle size between 5-15um. The first reduction of tungsten powder oxidized in the air became tungsten trioxide, and then making a second time reduction which we get tungsten powder particle size between 3-10um. From this we can see that the tungsten powder particle size reduction through the loop once and oxide twice was significantly better than using blue tungsten oxide reduction of tungsten powder for only once.

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