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无机材料学报

无机材料学报

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共沉淀法制备Al2O3-YAG复相陶瓷及其显微结构研究

王宏志1; 高濂1; 李炜群1; Hirokazu Kawaoka2; Koichi Niihara2   

  1. 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; 2. 日本大阪大学产业科学研究所, 大阪 567-0047
  • 收稿日期:1999-12-23 修回日期:2000-02-29 出版日期:2001-01-20 网络出版日期:2001-01-20

Preparation and Microstructure of Al2O3-YAG Composites

WANG Hong-Zhi1; GAO Lian1; LI Wei-Qun1; Hirokazu Kawaoka2; Koichi Niihara 2   

  1. 1.State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • Received:1999-12-23 Revised:2000-02-29 Published:2001-01-20 Online:2001-01-20

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摘要： 用共沉淀法制备了Ａｌ２Ｏ３－ＹＡＧ复合粉体，ＹＡＧ的结晶温度在１０００℃左右．共沉淀法 制备的Ａｌ２Ｏ３－ＹＡＧ复合粉体经１５５０℃热压烧结，获得致密烧结体，ＹＡＧ的加入量对烧结温度 的影响不大． Ａｌ２Ｏ３－５ｖｏｌ％ＹＡＧ复合材料的抗弯强度为６０４ＭＰａ，断裂韧性为５．０ＭＰａｍ１／２； Ａｌ２Ｏ３－２５ｖｏｌ％ＹＡＧ复合材料的抗弯强度为６１１ＭＰａ，断裂韧性为４５ＭＰａｍ１／２．所有这些数据 都高于单相Ａｌ２Ｏ３陶瓷的力学性能，说明ＹＡＧ的加入有利于Ａ１２Ｏ３陶瓷力学性能的提高． 通过显微结构观察发现：大的ＹＡＧ颗粒位于Ａｌ２Ｏ３晶界上，小的ＹＡＧ颗粒位于Ａｌ２O３晶粒 内．在 Ａｌ２Ｏ３－５ｖｏｌ％ＹＡＧ复合材料中，许多小的白色区域存在于 Ａｌ２Ｏ３晶粒内，这可能和较低 的Ｙ２Ｏ３含量有关．

关键词: YAG, 共沉淀, 复合材料, 显微结构

Abstract: Polycrystalline Al2O3-YAG composites were obtained by using the coprecipitation method. After calcining at different temperatures, the crystallization
of YAG was found at about 1000℃. Dense bodies could be got by hot-pressing at 1550℃. Bending strength and fracture toughness of Al2O3-5vol%YAG
and Al2O3-25vol%YAG composites were 604 MPa and 5.0MPa·m1/2, 611MPa and 4.5MPa·m1/2 respectively. It indicated that the incorporation of
YAG improved the mechanical property of Al2O3 ceramics. Through TEM observation, large YAG particles (about 1mm) located on the grain boundaries of Al2O3 were seen, and some small YAG particles (100-200nm)
was among Al2O3 grains in both composites. A lot of white areas were found in Al2O3-5vol% YAG composite, which maybe result from the low concentration of yttrium.

Key words: YAG, coprecipitation, composites, microstructure

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