Microstructures and Drying of the Alumina Green Body by the Gel-Casting Method

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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(12): 1467.

Gel-Casting으로 제조한 알루미나 성형체의 건조와 미세구조

오창준, 이홍림

연세대학교 공과대학 세라믹공학과

Microstructures and Drying of the Alumina Green Body by the Gel-Casting Method

ABSTRACT

The effects of the dispersion, drying, and binder burning-out on the green-microstructures of gelcasted alumina were studied. The slip consisting of 55 vol% alumina powder and 5 wt% organic materials was well-dispersed by adding 0.28 wt% polyelectrolyte polymer. Green bodies were dried at >85% relative humidity at room temperature. Green-microstructures were observed to be depended on the heating rate during binder burnout. Constant drying rate was not observed in drying process of gelcasted alumina. Sintered body showed its relative density higher than 99% when it was sintered at 1$600^{circ}C$ for 2 hours.