Migration of Grain Boundary Phases in AlN Ceramics by Heating in Reduced Atmosphere
Open Access
- 1 January 1989
- journal article
- Published by Ceramic Society of Japan in Journal of the Ceramic Society of Japan
- Vol. 97 (1131) , 1372-1378
- https://doi.org/10.2109/jcersj.97.1372
Abstract
The AlN ceramics containing 5 and 10wt% Y2O3 were densif ied at 1800°C for 1h in N2 gas, and annealed at 1900°C for 1, 3, 6 and 24h in N2 gas and reducing carbon gas atmospheres. The grain boundary phases, containing both Y4Al2O9 and Y2O3 or Y2O3 only, decreased with increasing annealing time. Y4Al2O9 decomposed into Y2O3 and Al2O3, which migrated towards the surface of the sintered body, and were nitrided on the surface to form a surface layer of YN and AlN. Shrinkage of the sintered body occurred during annealing with the elimination of the grain boundary phases from sintered body, and pore-free bodies were formed.Keywords
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