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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

(Ca,Mg)-α-Sialon的致密化,形成特性和显微结构

王佩玲; 张骋; 贾迎新; 孙维莹   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷; 超微结构国家重点实验室 上海 200050
  • 收稿日期:1998-08-10 修回日期:1998-09-25 出版日期:1999-08-20 网络出版日期:1999-08-20

Densification, Formation Behavior and Microstructure of (Ca,Mg) a Sialon

WANG Pei-Ling, ZHANG Cheng, JIA Ying-Xin, SUN Wei-Ying   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics Shanghai 200050 China
  • Received:1998-08-10 Revised:1998-09-25 Published:1999-08-20 Online:1999-08-20

PDF (PC)

837

被引次数

4

摘要： 利用热压工艺制备了组份为（ Ｃａ ， Ｍｇ）ｘ Ｓｉ１２ － ３ｘ Ａｌ３ｘ Ｏｘ Ｎ１６ － ｘ （ｘ ＝ ０３ 、０６ 、１０ 和１４） 的（ Ｃａ ， Ｍｇ） α- Ｓｉａｌｏｎ研究结果发现， 当ｘ≥１.０ 时， 材料的主晶相为α Ｓｉａｌｏｎ 和含 Ｍｇ 的 Ａｌ Ｎ 多型体多型体的含量随ｘ 值的增加而变大以复合添加剂取代单一添加剂， 不仅改善了α- Ｓｉａｌｏｎ 的烧结性能， Ｔ Ｅ Ｍ 和 Ｅ Ｄ Ａ Ｘ 的结果还进一步表明添加的 Ｃａ ＋ ＋ 离子进入α-Ｓｉａｌｏｎ ， 而 Ｍｇ＋ ＋ 离子进入 Ａｌ Ｎ-多型体， 为净化氮陶瓷的晶界提供了有效途径.

关键词: Ca, Mg, Sialon, AlN多型体

Abstract: (Ca,Mg)-α-Sialon for the compositions MxSi3-xAlxOxN16-x with x ranging from 0.3 to 1.4 were prepared by hot-pressing technique. The result showed that the
crystalline phase in the sintered material consists of α-Sialon and Mg-containing AlN-polytypoid when x is equal to or greater than
1.0 and the AlN-polytypoid content increases as the x-value increases. By the use of duplex metal oxide CaO/MgO, instead of CaO, as additives
to form α-Sialon, the material possesses a better sintering ability. TEM and EDAX results further revealed that the most of added Mg++ can be incorporated into the Sialon to form magnesium AlN-polytypoid
phase, whereas the most added Ca++ enters α-Sialon structure. The formation of magnesium-containing AlN-polytypoid phase in the composite
materials can provide a new approach to reduce the amount of glassy phase at the grain boundary.

Key words: Ca, Mg, Sialon, AlN-polytypoid

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