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不同稀土元素对α-Sialon-AlN-多型体复相陶瓷生成动力学的影响

陈卫武; 孙维莹; 严东生   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050
  • 收稿日期:1999-01-28 修回日期:1999-03-23 出版日期:2000-04-20 网络出版日期:2000-04-20

Effect of Rare Earth Elements on Formation Kinetics of α -AlN-Polytypoids Dual-Phase Ceramics

CHEN Wei-Wu; SUN Wei-Ying; YAN Dong-Sheng   

  1. State key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050; China
  • Received:1999-01-28 Revised:1999-03-23 Published:2000-04-20 Online:2000-04-20

摘要: 研究了以Y,Sm以及复合稀土Y+Sm分别作为α-Sialon的形成离子,组份为 90wt% α-Sialon(= 1,= 17)+10wt%12H的样品在 1450~1800℃热压条件下的致密化和反 应过程.结果表明,添加Y+Sm复合稀土对致密化最有利,不同的稀土元素对反应过 程有较大的影响,即在 Sm-组份中 α-Si很快消失, α-Sialon与 AIN-多型体同时形成而 Y- 组份中α-Si4消失较慢,α-Sialon的形成受到AlN一多型体的抑制.

关键词: α-Sialon, AlN一多型体, 复相陶瓷, 稀土元素, 反应过程

Abstract:

The densification and reaction sequence of 90wt%R-α' +10wt%12H (R=Y, Sm, Y+Sm) dual-phase ceramics hot-pressed in the temperature range of 1450~1800℃ were studied. The results show that the dual elements Y+Sm promote densification more effectively than Y-and Sin-element. In Sm-composition, Si3N4 disappears quickly and α-Sialon appears simultaneously with 12H--AIN--polytypoides. In Y--composition, however, Si3N4 dissolves slowly and 12H- AlN-polytypoid inhibits the formation of α-Sialon.

Key words: α -AlN-polytypoids dual-phase ceramics, rare earth elements, reaction sequence

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