酸窒化ケイ素の反応焼結に及ぼす種子結晶添加の影響

概要

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The relationships among reaction rate, densification behavior and microstructure development were examined for seeded or unseeded silicon oxynitride ceramics prepared from Si_3N_4, SiO_2 and a small amount of CeO_2. The reaction rate of silicon oxynitride without seed crystals was very low during the initial stage, because the nucleation was the rate-determining step for lack of favorable nucleation sites. The formation of silicon oxyrdtride was promoted by seeding. With the addition of seed crystals, the nucleation was almost terminated at the beginning of the reaction. Therefore, the formation of silicon oxynitride proceeded only by the growth of the nuclei originated at the beginning. The addition of a large amount of seed crystals, however, resulted in suppressed densification, because too marry rod-shaped silicon oxynitride grains were formed in the initial stage.
社団法人日本セラミックス協会の論文
1989-05-01