Sintering is the final process of tungsten carbide rods forming, which directly affects the densification and uniformity of the chemical properties of products. It is closely related to product performance and accuracy. Currently, the sintering of tungsten carbide rods is often conducted by adopting the methods of vacuum sintering, hot isostatic pressure (HIP) and low-pressure sintering.
The density and bending strength of tungsten carbide rods will be significantly improved and service life be greatly extended if it is put in a hot isostatic press at a pressure of 80 ~ 150MPa and a temperature of 1320 ~ 1400 ℃ and its porosity will be also reduced to 1/20~1/100 or even lower. Methods of vacuum sintering plus hot isostatic pressing can improve product quality more effectively than adopting HIP only. It is why it has become the primary means of producing high-quality cemented carbide rods.
Advantages of low pressure sintering technology is that it can effectively reduce micro-porosity, balance cobalt layer thickness, eliminate cobalt pool to a large extent, and prevent polycrystalline phenomenon caused by high-pressure technologies, while its cost is much lower than that of high-pressure technologies.
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