Mechanical Properties of <TEX>$beta$</TEX>-Sialon Prepared from Wando Pyrophyllite

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J. Korean Ceram. Soc. > Volume 23(4); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(4): 17.

완도납석으로부터 제조된$beta$-Sialon의 기계적 성질

이홍림, 장병국

연세대학교 요업공학과

Mechanical Properties of $beta$-Sialon Prepared from Wando Pyrophyllite

ABSTRACT

$beta$-Sialon powders were prepared by the reduction-nitridation reaction from the mixture of Wando-pyrophyllite and graphite at 135$0^{circ}C$ in $N_2-H_2$ atmosphere. The $beta$-Sialon powders were sintered at 175$0^{circ}C$ by the pressureless sintering for 90min and the hot-pressing for 60 min respectively. All the sintered bodies showed their relative densities higher than 94% The values of M.O.R fracture toughness(KIC) and hardness showed 32.9kpsi 2.9MN/$m^{1.5}$ , 12.1GN/$m^2$ for the pressure-less sitnered bodies and 48.6kpsi, 4.6 MN/4m^{1.5}$ 15.3GN/$m^2$ for the hot-pressed bodies respectively.