氮化硅陶瓷烧结过程中的致密化与相变^①

来源期刊：中国有色金属学报1996年第4期

论文作者：杨海涛 汤宇凌 徐润泽 黄培云

文章页码：153 - 155

关键词：氮化硅； 致密化； 相变

Key words：Si₃N₄;　densification;　phase transformation

摘    要：讨论了Si₃N₄-MgO-CeO₂陶瓷常压烧结过程中的致密化与相变。指出:对于Si₃N₄-MgO-CeO₂陶瓷，在1500~1550℃为快速致密化阶段，在1 550℃致密化过程已接近完成，α-Si₃N₄→β-Si₃N₄的相转变过程滞后于致密化过程，在1550~1600℃为β相转变百分数急剧增加阶段，在1600℃，α→β相变接近完成。α→β相变与其致密化并无直接、必然的关系。

Abstract: The effect of pressureless sintering on the densification and phase transformation of Si₃N₄-MgO-CeO₂ ceramics was studied. For the Si₃N₄-MgO-CeO₂ ceramics, the densification process took place rapidly from 1500 to 1550℃and nearly completed at 1550℃;　the phase transformation fromα-Si₃N₄toβ-Si₃N₄　took place rapidly from 1550 to 1600℃and nearly completed at 1600℃. The phase transformation process is behind the densification process and does not necessarily promote the densification of the Si₃N_4-MgO-CeO₂ceramics.