Effect of the liquid-forming additive content on the kinetics of abnormal grain growth in alumina

被引:60
|
作者
Ahn, JH [1 ]
Lee, JH
Hong, SH
Hwang, NM
Kim, DY
机构
[1] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151744, South Korea
[2] Seoul Natl Univ, Ctr Microstruct Sci Mat, Seoul 151744, South Korea
关键词
D O I
10.1111/j.1151-2916.2003.tb03486.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Alumina specimens with various amounts of CaO and SiO2 (1:2 ratio) were prepared, and their abnormal grain growth (AGG) kinetics were investigated. A plot of the area fraction covered by abnormal grains versus log (sintering time) had a sigmoidal shape with an apparent incubation period before the onset of AGG. The overall kinetics of AGG was similar to that of a phase transformation controlled by nucleation and growth. The incubation time and the end point of AGG were strongly dependent on the amount of liquid-forming additives. Correspondingly, the final microstructure was affected by the liquid content: a large grain size and a high aspect ratio at low liquid content and a small grain size and a low aspect ratio at high liquid content.
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页码:1421 / 1423
页数:3
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