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无机材料学报

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非均相沉淀法制备Al2O3-YAG复相陶瓷

王宏志; 高濂; 李炜群   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构开放实验室, 上海 200050
  • 收稿日期:1999-01-15 修回日期:1999-03-08 出版日期:2000-02-20 网络出版日期:2000-02-20

Preparation of Al2O3-YAG Composite by the Heterogeneous Precipitation Method

WANG Hong-Zhi; GAO Lian; LI Wei-Qun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute ofCeramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-01-15 Revised:1999-03-08 Published:2000-02-20 Online:2000-02-20

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摘要： 本文测量了ＹＡＧ粉体的ξ电位，通过调节ｐＨ值获得均匀分散的ＹＡＧ水悬浮液．采用非均相沉淀方法获得ＹＡＧ分布均匀的Ａｌ２Ｏ３－ＹＡＧ复合粉体．通过热压烧结得到致密烧结体，ＹＡＧ的加入对烧结温度的影响不大．Ａｌ２Ｏ３－５ｖｏｌ％ＹＡＧ复相陶瓷的抗弯强度为４８５ＭＰａ,断裂韧性为４．２ＭＰａ·ｍ１／２，均高于单相Ａｌ２Ｏ３陶瓷，数据的重复性好于球磨混合所制备的样品．通过ＴＥＭ观察，ＹＡＧ颗粒均匀分布于整个样品中，表明通过非均相沉淀制粉可以获得ＹＡＧ颗粒分布均匀的Ａｌ２Ｏ３－ＹＡＧ复相陶瓷．

关键词: 非均相沉淀法, YAG, Al2O3, 复相陶瓷

Abstract: Zeta potential of YAG powder was measured, and well-dispersed YAG aqueous suspension could be obtained through regulating pH value. Al2O3-YAG
composite powder containing uniformly distributed YAG was prepared by using the heterogeneous precipitation method. Sintered bodies were gotten by hot-pressing,
and addition of YAG influenced little on sintering temperature. Bending strength and fracture toughness of Al2O3-5vol%YAG composite were 485MPa and
4.2MPa·m1/2 respectively. Both were higher than those of monolithic Al2O3 ceramics, and the reliability of values was also better than that of
Al2O3 ceramics. Through TEM observation, it could be seen that YAG particles were uniformly distributed throughout materials. It indicated that Al2O3-YAG
composite with good YAG dispersion could be obtained by using the heterogeneous precipitation method.

Key words: YAG, Al2O3, powder, precipitation, composite

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