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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Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South KoreaKorea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea
Park, CW
Yoon, DY
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Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South KoreaKorea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea