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无机材料学报

• 研究论文 • 上一篇    下一篇

SiC颗粒尺寸对Al2O3-SiC纳米复合陶瓷的影响

王宏志; 高濂; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷; 超微结构开放实验室 上海 200050
  • 收稿日期:1998-08-31 修回日期:1998-09-29 出版日期:1999-08-20 网络出版日期:1999-08-20

Silicon Carbide Particle Size Effects in Al 2O 3 SiC Nanocomposites

WANG Hong-Zhi , GAO Lian, GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-08-31 Revised:1998-09-29 Published:1999-08-20 Online:1999-08-20

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摘要： 采用非均相沉淀法制备含有不同粒径 Ｓｉ Ｃ 颗粒的 Ａｌ２ Ｏ３-Ｓｉ Ｃ 复合粉体， 粉体呈 Ａｌ２ Ｏ３ 包裹 Ｓｉ Ｃ 的形貌， 经热压烧结获得致密烧结体通过 Ｓ Ｅ Ｍ 观察， Ａｌ２ Ｏ３ 基体晶粒尺寸随着加入 Ｓｉ Ｃ 颗粒粒径的减小而减小但减小的趋势比 Ｚｅｎｅｒ 模型预测的弱力学性能随着加入 Ｓｉ Ｃ 颗粒粒径的减小而得到改善， 这主要同 Ｓｉ Ｃ 颗粒对基体的弱化作用减弱及基体粒径变小有关

关键词: 纳米复合陶瓷, 颗粒尺寸, 氧化铝, 碳化硅, 力学性能

Abstract: Al2O3-SiC composite powders including different size SiC particles were prepared by the heterogeneous precipitation method. The TEM
morphology of Al2O3 coating SiC particles was observed. Dense bodies were obtained by hot pressing. SEM observation showed, the Al2O3
matrix grain size became smaller with the addition of smaller size SiC particles, but the reduction trend was not as strong as Zener expected. The mechanical properties
of nanocomposites increased when the size of SiC inclusion became smaller, which was relative to smaller weakening effect of SiC particles on matrix
grain and smaller matrix grain size.

Key words: nanocomposites, particle size, alumina, silicon carbide, mechanical propertie

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