粒径の異なるβ窒化ケイ素を出発粉末としたα-SiAlONの合成

概要

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β-Si_3N_4 powders with different particle size, AlN and Y_2O_3 were used as starting materials to fabricate α-SiAlON by hot-pressing. Five mass% of commercial α-SiAlON powder was also added as seeds to these mixtures to increase the formation rate of α-SiAlON. No significant increase in the α-SiAlON content was found by seed addition when coarse β-Si_3N_4 powder was used. However, in samples sintered from fine β-Si_3N_4 powder, the addition of seeds promoted α-SiAlON formation and a content of 100 mass% (compared to the 60 mass% without seed) could be achieved. When the starting powder β-Si_3N_4 was coarse, large α-SiAlON and β-Si_3N_4 grains were obtained, the residual β-Si_3N_4 phase being located within the α-SiAlON grains also could be found. In principle fine-grained β-Si_3N_4 and α-SiAlON could both form from fine β-Si_3N_4 powder, residual β-Si_3N_4 was hardly deserved within α-SiAlON grains.
社団法人日本セラミックス協会の論文
2000-03-01