Preparation and Properties of Na-Ca-Si-O-N System Oxynitride Glasses

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J. Korean Ceram. Soc. > Volume 30(2); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(2): 85.

Na-Ca-Si-O-N계 Oxynitride Glass의 제조 및 특성

이종호, 이용근, 최세영

연세대학교 세라믹공학과

Preparation and Properties of Na-Ca-Si-O-N System Oxynitride Glasses

ABSTRACT

Oxynitride glasses in Na-Ca-Si-O-N system were prepared by melting at 135$0^{circ}C$ for 2 hours in N2 gas. The effects of Si/Na mole ratio and the various Si3N4 contents were investigated. Stable oxynitride glasses can be obtained up to 9wt.% Si3N4 content in case the Si/Na mole ratio was 2.12 and 1.62, but $beta$-Si3N4 was precipitated at 9wt.% Si3N4 content in case the Si/Na mole rtio was 1.12. Density (p), chemical durability, hardness (Hv), and fracture toughness (KIC) increased with increasing Si3N4 content. In cae the Si/Na mole ratio was 1.12, the increment of properties was remarkable but hardness and fracture toughness did not increase no longer owing to precipitation of $beta$-Si3N4.