Abnormal Grain Growth Behaviors of <TEX>$BaTiO_3$</TEX> Ceramics with Controlling of Particle Size Distributjion of Calcined Powder

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J. Korean Ceram. Soc. > Volume 32(2); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(2): 147.

하소분체의 입도조절에 따른 $BaTiO_3$ 요업체의 비정상 입성장거동

이태헌, 김정주, 김남경, 조상희

경북대학교 무기재료공학과

Abnormal Grain Growth Behaviors of $BaTiO_3$ Ceramics with Controlling of Particle Size Distributjion of Calcined Powder

ABSTRACT

Abnormal grain growth behavior of BaTiO3 ceramics with controlling of particle size distribution of calcined powder was investigated. The particle size distribution was controlled by changing the calcining temperature or by using of classification and regrinding process. With broadening of the normallized size distribution in calcined powder, it showeda normal grain growth behavior in sintered body due to an increase of volume fraction of seed grain in the calcined powder. It was supposed that the seed grains could easily contact each other for the rapid grain growth during sintering process and resulted in fast switching-over from abnormal to normal grain growth stage.

Key words: Abnormal grain growth, Particle size distribution, Seed grain normal grain growth