Tungsten Carbide Button Low Pressure Hot Isostatic Pressing

After tungsten carbide button sintering process, there can be some pores inside button which will affect its property. Thus reducing pores in the button is an effective way to promote its property. In 1960s, Kennametel Corp in America firstly applied hot isostatic pressing method into producing tungsten carbide button. This method reduces a lot of pores in the tungsten carbide button; enhance its density and tenacity, prolong its service life.

However, hot isostatic pressing method requires expensive equipment; it is of low efficiency which increases producing cost. In order to solve these problems, some researchers combine vacuum sintering with hot isostatic pressing which is called low pressure hot isostatic sintering method. It can fully improve property of tungsten carbide button which decreases pores in the button and refined tungsten carbide grain size. It eliminates the coarse tungsten carbide grain on the surface of button and prevents gradients from alternating on the surface of tungsten carbide button. Thus increase its mechanical property.


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