Effects of the Colloid/Interface Variables on Densification and Pore Elimination of Zirconia

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J. Korean Ceram. Soc. > Volume 27(2); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(2): 169.

콜로이드/계면변수가 Zirconia의 치밀화와 기공제거에 미치는 영향

장현명, 한규호, 이기강¹, 정한남²

포항공과대학 재료·금속공학과
¹경기대학교 공과대학 재료공학과
²산업과학기술연구소 에너지 연구부

Effects of the Colloid/Interface Variables on Densification and Pore Elimination of Zirconia

ABSTRACT

The sintering characteristics of ZrO2 were analyzed in terms of pore microstructure and kinetics of pore elimination. The pore structue of the ZrO2 sample prepared from colloid suspension was characterized by three distinct types of pores ; intradomain, interdomain, and intergglomerate pores. Sintering data at 1600$^{circ}C$ showed that pores larger than a certain critical size(∼3$mutextrm{m}$) were difficult to remove, and this was analyzed in terms of the interagglomerate pore formed from the suspension under the condition of low kinetic stability, that is, the stability ratio smaller than its critical value. A theoretical equation for densification rate was derived and was applied to the densification rate of the ZrO2 polycrystalline body containging both the matrix(the 1st-generation) pores and the interagglomerate (the 2nd-generation) pores under the condition of slow grain growth.