Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629801 | Journal of the European Ceramic Society | 2005 | 6 Pages |
Abstract
Sintering behavior of three different compositions in the AlN-Al2O3 system using Y2O3 as a sintering aid was investigated. Samples with various ratios of AlN/Al2O3 were sintered in nitrogen atmosphere using a gas pressure furnace in the temperature range 1750-1950 °C. The densification of the samples was studied by shrinkage and relative density measurements. Results showed that samples containing 1 and 70 wt.% alumina were sintered to near theoretical density at 1800 °C; whereas the sample with 20 wt.% alumina never reached densities higher than 93% in the temperature range considered. It was found that the AlN/Al2O3 ratio and the sintering temperature had a great influence on the microstructure and crystalline phases present in the samples, namely, AlN, γ-AlON, 27R, and YAG. In the sample with 20 wt.% alumina, porosity formation prevented further densification. These porosities were probably due to the release of oxygen during sintering.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A. Maghsoudipour, M.A. Bahrevar, J.G. Heinrich, F. Moztarzadeh,