The four steps are applies an axial pressure to the powder, produces plasma for activation of the powder particles through pulse current discharge, with a direct current resistance of the sample is heated up to the required temperature and maintained for a certain time and the stress relief step. The most obvious difference between SPS and PAS is the third step, which SPS is heating by pulse current and it does not use DC as hot source during the whole sintering process.
Compared to common hot pressed sintering, conventional sintering and hot isostatic pressing (HIP), tungsten carbide nozzle plasma activated sintering technology has many advantages. First of all, it uses a DC to heat powder material and a graphite mold directly, and uses switching DC pulse voltage to generate high-temperature plasma among the powder particles or between voids. Therefore, the operation will be more convenient and more precise in carbide cutting inserts sintering energy controlling. And the inside of material has been heated uniformly, the heat transfer efficiency improved, the material densification improved.
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