Synthesis of <TEX>$alpha$</TEX>-Sialon from Kimcheon Quartzite

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J. Korean Ceram. Soc. > Volume 24(5); 1987 > Article

Journal of the Korean Ceramic Society 1987;24(5): 491.

김천규석으로부터 $alpha$-Sialon의 합성

이홍림, 서원선, 조덕호¹, 이경원¹

연세대학교 요업공학과
¹국립 공업시험원

Synthesis of $alpha$-Sialon from Kimcheon Quartzite

ABSTRACT

Silicon nitride powder synthesized from Kimcheon quartzite and commercial reagents, AlN and Y2O3 powders were used to prepare the partially and fully stabilized Y-${alpha}$-Sialon ceramics by the pressureless sintering at 1800$^{circ}C$ for 2 hours in N2 atmosphere. Good mechanical properties of the prepared Y-${alpha}$-Sialon ceramics were found over 0.4∼0.6 of the Yttrium solubility range, X, in the equation Yx(Si12-4.5x, Al4.5x)(O1.5x, N16-1.5x). The properties of these prepared Y-${alpha}$-Sialon ceramics were compared with those prepared in the same way from a commercial Toshiba Si3N4 powder.