Thermomechanical Properties of <TEX>$beta$</TEX>-Sialon Synthesized from Kaolin

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J. Korean Ceram. Soc. > Volume 24(4); 1987 > Article

Journal of the Korean Ceramic Society 1987;24(4): 349.

카올린으로부터 합성한 $beta$-Sialon의 열적.기계적 성질

이홍림, 임헌진, 김신, 이형복¹

연세대학교 공과대학 요업공학과
¹명지대학교 요업공학과

Thermomechanical Properties of $beta$-Sialon Synthesized from Kaolin

ABSTRACT

${beta}$-Sialon powder was synthesized by the simultaneous reduction and nitridation of Hadong kaolin at 1350$^{circ}C$ in N2-H2 atmosphere, using graphite as a reducing agent. The synthesized ${beta}$-Sialon powder was pressurelessly sintered over 1450-1850$^{circ}C$ in nitrogen atmosphere. The average particle size of ${beta}$-Sialon powder was about 4.5$mutextrm{m}$. The relative density, M.O.R., fracture toughness and micro-hardness of ${beta}$-Sialon ceramics sintered at 1800$^{circ}C$ for 1 hour were 92%, 36 kpsi, 2.8MN/㎥/2 and 13.3 GN/㎡, respectively. The critical temperature difference (ΔT) in water quench thermal shock behavior showed about 375$^{circ}C$ for the synthesized ${beta}$-Sialon ceramics.