| 共沉淀法制备Al_2O_3-YAG复相陶瓷及其显微结构研究 |
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| 引用本文： | 王宏志,高濂,李炜群,Koichi Niihara.共沉淀法制备Al_2O_3-YAG复相陶瓷及其显微结构研究[J].无机材料学报,2001,16(1). |
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| 作者姓名： | 王宏志 高濂 李炜群 Koichi Niihara |
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| 作者单位： | 1. 中国科学院上海硅酸盐研究所
2. 日本大阪大学产业科学研究所, |
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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．
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| 关 键 词： | YAG 共沉淀 复合材料 显微结构 |
Preparation and Microstructure of Al_2O_3-YAG Composites |
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| WANG Hong-Zhi,GAO Lian,LI Wei-qun,Hirokazu Kawaoka,Koichi Niihara.Preparation and Microstructure of Al_2O_3-YAG Composites[J].Journal of Inorganic Materials,2001,16(1). |
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| Authors: | WANG Hong-Zhi GAO Lian LI Wei-qun Hirokazu Kawaoka Koichi Niihara |
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| 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 1000C. Dense bodies could be got by hot-pressing at 1550C. Bending strength and fracture toughness of Al2O3-5vol%YAG and Al2O3-25vol%YAG composites were 604 MPa and 5.0MPa1/2, 611MPa and 4.5MPa1/2 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 (100200nm) 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. |
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| Keywords: | YAG coprecipitation composites microstructure |
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