Tungsten Powder Production Process

Tungsten powder is manufactured under strict quality control as raw materials of high density composites, diamond tools, metallizing paste, sintered parts of tungsten, etc. The manufature of tungsten powder is a key step in tungsten metal and alloy production, which significantly affect the properties of the subsequent products.

Production of tungsten powder is accomplished almost exclusively by the hydrogen reduction of tungsten oxides. The hydrogen reduction of tungsten halides and the carbon reduction of the tungsten oxides are presently not applied in industry on a large scale.

The common raw materials of tungsten powder reduction are tungsten trioxide and tungsten blue oxide(TBO), the latter  has been the most widely used material since 1970s. Also, tungstic acid(H2WO4), tungsten yellow oxide and tungsten purple oxide are only used in selected metal grades.

The reduction of tungsten oxides by hydrogen is the essential reaction in tungsten powder production process,which equation and reaction process are shown as follow:

WOX+XH2=W+XH2O

FIGURE1. Reduction process of tungsten oxide

The reduction can produce tungsten powder of grain size between 0.1 and 10μm starting from the same oxide precursor. 

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