Tungsten powder is one of most important raw material for production of tungsten carbide, tungsten alloy, pure tungsten and the properties of it strongly affect performance of subsequent products .The geometrical properties of tungsten powder includes grain size, specific surface area, morphology of tungsten powder, etc.

Grain size

The grain size of tungsten powder heavily influence the process of powder forming, sintering, machining and the performances of Final products. For instance grain size of tungsten carbide is mostly determined by the grain size of tungsten powder which is an raw material of tungsten carbide . Dry sieving method and Fisher method are commonly used in measuring tungsten powder’ grain size which often dived into 5 levels:

Ultracoarse particle: Average grain size＞30μm;

Coarse particle: Average grain size 10-30μm;

Medium particle: Average grain size 3-10μm;

Fine particle: Average grain size 0.5-3μm;

Ultrafine particle: Average grain size ＜0.5μm.

 

Specific surface area

Specific surface area of tungsten powder directly determines the powder’s surface activation energy, which often used for evaluate powder’s average grain size. Commonly BET method for measuring specific surface area are applied for tungsten powder.