Effect of Intergranular Phase on Mechanical Properties of Si3N4-Si2N2O Composites

Kazuo NAKAMURA; Yasuharu OKASHIRO; Masayoshi OHASHI; Kiyoshi HIRAO; Takaaki NAGAOKA; Koji WATARI; Masaki YASUOKA; Shuzo KANZAKI

doi:10.2109/jcersj.100.1169

Effect of Intergranular Phase on Mechanical Properties of Si₃N₄-Si₂N₂O Composites

Kazuo NAKAMURA, Yasuharu OKASHIRO, Masayoshi OHASHI, Kiyoshi HIRAO, Takaaki NAGAOKA, Koji WATARI, Masaki YASUOKA, Shuzo KANZAKI

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Keywords: Si₃N₄, Si₂N₂O, Intergranular phase, Fracture toughness, Flexural strength

JOURNAL FREE ACCESS

1992 Volume 100 Issue 1165 Pages 1169-1171

DOI https://doi.org/10.2109/jcersj.100.1169

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Abstract

Ce/Si ratio increased with the formation of Si₂N₂O in Ce-doped Si₃N₄ based ceramics with SiO₂ addition. The intergranular liquid remained as a glass on cooling until the ratio exceeded a certain level when the intergranular liquid crystallized as cerium nitrogen apatite (Ce₅(SiO₄)₃N-Ce_4.67(SiO₄)₃O) during cooling. There were large differences in flexural strength, fracture toughness between the specimens with the intergranular glassy phase and the ones with the intergranular crystalline phase. Mechanical properties of the bulk bodies depended on those of the intergranular phases.

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