The Study on the Improvement of the Strength and the Thermal Shock Resistance of <TEX>$Al_2O_3-ZrO_2$</TEX> Composites

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J. Korean Ceram. Soc. > Volume 25(3); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(3): 225.

$Al_2O_3-ZrO_2$ 복합체의 강도 및 열충격 저항의 향상에 관한 연구

황규홍, 배원태, 최명덕, 오기동¹, 김경운², 김환²

경상대학교 재료공학과
¹부산대학교 무기재료과
²서울대학교 무기재료과

The Study on the Improvement of the Strength and the Thermal Shock Resistance of $Al_2O_3-ZrO_2$ Composites

ABSTRACT

The strength and thermal shock resistance of $Al_2O_3-ZrO_2$ composites have been studied. The tetragonal $ZrO_2$ powder containing 1 mol.% $Y_2O_3$ and monoclinic $ZrO_2$ powder were prepared by coprecipitation method and subsequently mixed with $Al_2O_3$ powder and granulated by sieving. Duplex composites were prepared by dry mixing matrix agglomerate with 15 to 30 vol.% of dispersion agglomerate, followed by pressing and sintering at 1$600^{circ}C$ for1 hr. These $Al_2O_3-ZrO_2$ 2 composites having heterogeneous structure showed improved thermal shock behaviors because of the microcracking and pores in dispersed granules, and compressive stresses around dispersed granules resulting from $ZrO_2$ transformation.