The Influence of Sintering Process on the Microstructure of Submicron Alumina Fabricated by Gelcasting
Using ultra-fine alumina powders as raw materials, the submicron transparent alumina with relative density more than 99.9% was fabricated by gelcasting and then sintering-HIP process. It was found that only the samples with relative density more than 95% after presintering could obtain fully densification by post-HIP treatment. The final grain sizes increased after post-HIP treatment and were decided by either HIPing temperature or presintering temperature, depending on which one is higher. The maximal strength can reach about 650MPa when grain size is about 1 μm.
Wei Pan and Jianghong Gong
L. H. Qi, J. Shen, W. Pan, "The Influence of Sintering Process on the Microstructure of Submicron Alumina Fabricated by Gelcasting", Key Engineering Materials, Vols. 336-338, pp. 1185-1187, 2007