Portal de Periódicos da CAPES

Effect of the Liquid‐Forming Additive Content on the Kinetics of Abnormal Grain Growth in Alumina

2003; Wiley; Volume: 86; Issue: 8 Linguagem: Inglês

10.1111/j.1151-2916.2003.tb03486.x

1551-2916

Jung‐Hyuck Ahn, Je‐Hun Lee, Seong‐Hyeon Hong, Nong‐Moon Hwang, Doh‐Yeon Kim,

Aluminum Alloy Microstructure Properties

Alumina specimens with various amounts of CaO and SiO 2 (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.