Compaction and Sintering Behavior of Zirconia Powders : II. Sintering Behaviour

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J. Korean Ceram. Soc. > Volume 30(6); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(6): 449.

지르코니아 분말의 치밀화와 소결거동 : II. 소결거동

박홍채, 김겸, 김영우, 이윤복, 오기동, Frank L. Riley¹

부산대학교 무기재료공학과
¹영국 리즈대학교 요업과

Compaction and Sintering Behavior of Zirconia Powders : II. Sintering Behaviour

ABSTRACT

Sintering behaviour of zirconia powders prepared by different processing treatment was discussed. About >99% densities of theoretical were obtaiend on sintering at 140$0^{circ}C$ for 2h in case of 300MPa uniaxially cold-pressed compact. But the lower densities were obtained on sintering above this temperature due to abnormal grain growth enabling the tetragonal to monoclinic phase transformation during cooling resulted in microcracks. All kinds of different dried powders exhibited nearly the same shrinkage behaviour with end-point shrinkage between 19 and 20%, and had maximum shrinkage rate (0.99~1.27%/min) around 120$0^{circ}C$. During whole sintering process densification was mainly governed by grain growth and rearrangement of agglomerates. Heterogeneous abnormal grain growth and abrupt decrease in shrinkage were observed when continuous interagglomerate pore collapsed into isolated pores.