Abstract
Powder mixtures of β-SiC-α-Si3N4 in a weight ratio of 1 : 1 containing 5–20 wt% Y-Mg-Si-Al-O-N oxynitride as a sintering additive were liquid-phase sintered at 1800°C for 3 h by hot-pressing. These materials had a microstructure of “in situ-toughened composites” as a result of the α → β phase transformation of Si3N4 during sintering. The introduction of larger amount of additives accelerated the grain growth of elongated β-Si3N4 grains with higher aspect ratio, resulting in the improved fracture toughness and strength. Typical flexural strength and fracture toughness of SiC-Si3N4 composites containing 15 wt% oxynitride glass were 860 MPa and 5.7 MPa · m1/2, respectively.
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