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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Ln-α-Sialon-AlN-多型体(Ln=Y,Y+Sm and Sm)复相陶瓷微观结构的研究

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:1999-05-13 修回日期:1999-07-21 出版日期:2000-06-20 网络出版日期:2000-06-20

Microstructures of Ln-α-Sialon-AlN-Polytypoid (Ln=Y, Y+Sm and Sm)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; Shanghai 200050; China
  • Received:1999-05-13 Revised:1999-07-21 Published:2000-06-20 Online:2000-06-20

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摘要： 研究了以Y，Y＋Sm和Sm分别作为α－Sialon形成离子、组份为90wt％α－Sialon（m=1，n=1.7）＋10wt％12H的样品在1650～1800℃热压条件下微观结构变化．结果表明，不同稀土离子对材料中。α-Sialon的晶粒形貌、微观结构的均匀性等都有较明显的影响，α－Sialon在三个组份中都为长柱状晶粒，但长径比不同．因此，改变材料中稀土的种类可能会为材料显微结构设计提供新途径．

关键词: 稀土元素, Ln－α－Sialon－AlN-多型体复相陶瓷, 微观结构

Abstract: The microstructures of Ln-α-Sialon-AlN-polytypoid(Ln=Y, Y+Sm and Sm)dual-phase ceramics, with a overall composition 90wt%α-Sialon(m=1, n=1.7)+10wt%12H,
hot-pressed in the range of 1650～1800℃, were studied by SEM. The results show that in all compositions, α-Sialon grains are small at 1650℃ and part of them exhibits elongated morphology at 1800℃.
The morphologies of α-Sialon grains are slightly varied with different rare-earth elements. Sm-α-Sialon exhibites the finest microstructures
with the aspect ratio of elongated grains of 7～9. In Y-composition, α-Sialon is coarsest grains with the aspect ratio of elongated grains of 2～3. There is
agglomerated AlN-polytypoid in all compositions, and which shows fiber-like morphology. The extent of non-uniform distribution of AlN-polytypoids in these
composite ceramics decreases in the sequence of Y-, Y+Sm- and Sm-composition. These differences of microstructure may be attributed to the effect of different
rare-earth elements on the formation kinetics of Ln-α-Sialon-AlN-polytypoid dual-phase ceramics.

Key words: rare-earth elements, Ln-α-Sialon-AlN-polytypoid dual-phase ceramics, microstructures

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