Abstract
Using Mg-α-SiAlON powders synthesized by carbothermal reduction-nitridation, fabrication of Mg-α-SiAlON ceramics was attempted through gas pressure sintering method. Furthermore, the effect of Si3N4 addition on densification of the synthesized powders was investigated. As a result, as-synthesized powders were transformed into β-SiAlON and did not densify during firing. On the other hand, in the case of samples with α-Si3N4 powder, it was found that full densification occurred and the Mg-α-SiAlON phase did not change upon gas pressure sintering, namely, dense Mg-α-SiAlON ceramics, composed of fine and uniform grains, could be obtained through firing at 1950°C for 2h.
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