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无机材料学报

无机材料学报

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YAG- Al2O3纳米复合材料的制备和力学性能

高濂; 李炜群; 王宏志   

  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:1999-11-16 修回日期:2000-03-16 出版日期:2000-12-20 网络出版日期:2000-12-20

Preparation and Mechanical Properties of 25vol%YAG-Al2O3 Nanocomposites

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

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-11-16 Revised:2000-03-16 Published:2000-12-20 Online:2000-12-20

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摘要： 本文介绍用化学共沉淀和在适当温度下煅烧以直接制备ＹＡＧ－Ａｌ２Ｏ３纳米复合粉体的新方法．ＸＲＤ结果表明，所得粉体具纯的ＹＡＧ和α－Ａｌ２Ｏ３相，因此其化学组成符合配料的组分设计．用本方法制备的２５ｖｏｌ％ＹＡＧ－Ａｌ２Ｏ３复合粉体经热压烧结，所得的致密体材料为晶内型纳米复合材料，其抗育强度达 ６１２ＭＰａ，断裂韧性为 ４．５４ＭＰａ·ｍ－１／２，都比单相 Ａｌ２Ｏ３陶瓷有大幅度提高。

关键词: YAG, 纳米, 复合材料

Abstract: 25vol%YAG-Al2O3 nanocomposite powders were prepared by the co-precipitaion method from ytrium nitrate and aluminium nitrate as starting materials.
The XRD pattern for the prepared powder calcined at 1300℃ for 1h shows well-defined peaks whose positions are almost identical
to those of stoichometic YAG and α-Al2O3. The powder compacts by hot-press sintering for 0.5 h at 1400℃ and 300MPa reached
a density close to the thoretical, while the normally reported hot-press sintering temperature for YAG-Al2O3 composites is 1600℃.
The bending strength and fracture toughness of prepared 25vol%YAG-Al2O3 nanocomposite were 612 MPa and 4.54 MP·m-1/2, respectively,
which are much higher than those of monolithic Al2O3 and monolithic YAG, as well as higher than those reported in other studies for YAG-Al2O3
composites. Microstructure studies found that the nano-YAG particles were mainly located within the Al2O3 grains.

Key words: preparation, YAG-Al2O3, nanocomposite

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