Mechanical Properties of the Ceramics of the System Al2O3-ZrO2-Y2O3 Prepared by the Precipitation Method

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J. Korean Ceram. Soc. > Volume 25(4); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(4): 364.

침전법에 의한 Al2O3-ZrO2-Y2O3계 세라믹스의 기계적 특성

김준태, 이홍림

연세대학교 공과대학 요업공학과

Mechanical Properties of the Ceramics of the System Al2O3-ZrO2-Y2O3 Prepared by the Precipitation Method

ABSTRACT

The mechanical properties and microstructure of ceramics of the system Al2O3-ZrO2-Y2O3 sintered at 1$650^{circ}C$ for 2h after powder preparation by the precipitation method from Al2(SO4)3.18H2O, ZrOCl2.8H2O and YCl3.6H2O were investigated. The Al2O3-ZrO2-Y2O3 ceramics sintered at 1$650^{circ}C$ for 2h after mixing alpha-Al2O3 and ZrO2-Y2O3 powders, both were separately precipitated and calcined, were found to have the relative density higher than 97.5% so that the strengthening and toughening mechanisms could be explained mainly as the stress-induced phase transformation. On the other hand, the sintered bodies prepared by co-precipitating the three starting materials were measured to have the relative density lower than 85% so that the degradation of strength were observed above 15 vol% ZrO2 contents due to the high porosity by which the effect of stress-induced phase transformation was assumed to be depressed.