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Effect of Liquid Content on the Abnormal Grain Growth of Alumina

2001; Wiley; Volume: 84; Issue: 7 Linguagem: Inglês

10.1111/j.1151-2916.2001.tb00883.x

1551-2916

Seong‐Hyeon Hong, Doh‐Yeon Kim,

Aluminum Alloys Composites Properties

Alumina specimens with small amounts of CaO and TiO 2 were prepared and their microstructural evolution during sintering was investigated. Because of the appearance of a liquid phase during sintering, a duplex microstructure of a few abnormal grains and fine matrix grains was obtained when the CaO + TiO 2 content was small (≤0.04 wt%). When the CaO + TiO 2 content was relatively high (≥0.1 wt%), many grains grew and impinged upon each other. As a result, a rather uniform and homogeneous microstructure was observed.