Ammonium Paratungstate Preparing Coarse Spherical Tungsten Powder （Ⅰ）

Tungsten is being widely applied in the modern science and industry, especially tungsten alloy, tungsten carbide and other tungsten heavy alloy which is of high wear resistance and high corrosion resistance. Among which coarse spherical tungsten powder is an important material for preparing coarse tungsten carbide powder. Coarse spherical tungsten powder is of higher density and hardness which is widely applied in mining tools, oil drills, cutting tools, etc.

Nowadays the main tungsten powder preparing method is calcinating ammonium paratungstate into blue tungsten oxide or yellow tungsten oxide and then process through hydrogen reduction. Tungsten powder prepared by this method is of regular multi crystal and grain size is between 2-5um. In 1980s, adding alkali metal salts in tungsten oxide and process mid-temperature reduction method will enlarge the grain size of tungsten powder. Adding Na and Li together will maximize the property of tungsten powder.


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