Micron-sized Ammonium Paratungstate

Compared to traditional tungsten powder, preparation of fine tungsten powder can reduce sintering temperature. If the distribution of grain is close, structure of material after sintering will remain the nano-size.

A lot of researches have been done for super fine tungsten powder, like gas evaporation method, high energy ball milling; other method like control the hydrogen amount, temperature, adding dopant, etc. This method is easy to operate, low cost; the finished product is of high quality. Also yellow tungsten oxide, blue tungsten oxide, violet tungsten oxide is being used as raw materials to produce fine tungsten powder. Electrolyzation of tungsten oxide is also applied in the producing. But it is of high cost and low efficiency.

Ammonium paratungstate prepared by hydrogen reduction used to prepare tungsten powder is feasible. The ammonium paratungstate grain size is between 25-60um, which is not suitable for producing super fine tungsten powder. So the preparation of micron-sized ammonium paratungstate is the key problem.



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