A Study on the Initial Stage of Sintering and the Grain Growth of ZnO in ZnO-Bi2O3 System

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J. Korean Ceram. Soc. > Volume 26(4); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(4): 505.

ZnO-Bi2O3계의 소결초기단계와 입자성장에 관한 연구

성건용, 강을손, 김종희

한국과학기술원 재료공학과

A Study on the Initial Stage of Sintering and the Grain Growth of ZnO in ZnO-Bi2O3 System

ABSTRACT

The sintering behavior and grain growth of ZnO in 99.0mol% ZnO-1.0mol% Bi2O3 which are the basic compositions of ZnO varistor were studied. The microstructrual observation confirmed that the final sintered density was mainly determined at the initial stage of sintering, i.e. grain rearrangement and grain growth which were induced by the penetration of eutectic melts formed at eutectic temperature(74$0^{circ}C$). But when the liquid penetration was terminated, the grain growth did not promote further densification. Activation energy of the grain growth of ZnO in the system of 99.0mol% ZnO-1.0mol% Bi2O3 was 44.8$pm$1.8Kcal/mol.