Effect of Yttria and Ceria on Mechanical Properties and Oxidation Behaviors of <TEX>$alpha$</TEX>-Sialon Ceramics

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J. Korean Ceram. Soc. > Volume 30(11); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(11): 941.

$alpha$-Sialon 세라믹스의 역학적 성질과 산화거동에 미치는 $Y_2O_3$ 및 $CeO_2$의 첨가영향

이은복, 이홍림, 조덕호¹, 박원철²

연세대학교 세라믹공학과
¹요업기술원
²한국유리공업 주식회사

Effect of Yttria and Ceria on Mechanical Properties and Oxidation Behaviors of $alpha$-Sialon Ceramics

ABSTRACT

The powder mixture of Si3N4-AlN-Y2O3, Si3N4-AlN-CeO2 and Si3N4-AlN-Y2O3-CeO2 system was hot-pressed at 175$0^{circ}C$ for 2h in N2 to prepare $alpha$-Sialon ceramics. The mechanical property and oxidation behaviour of the prepared $alpha$-Sialon ceramics were investigated. At 120$0^{circ}C$, oxidation resistance was best for the Y2O3 added $alpha$-Sialon ceramics and oxidation rate increased when the amount of CeO2 increased. But when the mixture of Y2O3 and CeO2 added $alpha$-Sialon ceramics showed a good oxidation resistance. Fracture toughness of (Y2O3＋CeO2) added $alpha$-Sialon ceramics was higher than Y2O3 added $alpha$-Sialon ceramics.