アルミナを添加したAlN焼結体の強度
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概要
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The effect of oxygen composition on the crystal phases and flexural strength of AIN hot-pressed under 200 kg/cm<SUP>2</SUP> for one hour at 1600-2100°C was examined. The A1N pseudo-polytype in 2Hδ structure was formed in the specimens hot-pressed at temperatures above 1900°C containing about 2.7 wt% oxygen. In these experiments, specimens from the powder with 2.7 wt% oxygen (97.6 mol% A1N) had the highest strength of 48 kg/mm<SUP>2</SUP>. The oxygen addition enhances densification and increases flexural strength because of forming spinel-type aluminum oxynitride and/or needle-shaped pseudo-polytypes in the grain boundary of A1N. The excess formation of the pseudo-polytype, however, seemed to be undesirable in the attainment of strong material.
- 社団法人 粉体粉末冶金協会の論文
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