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无机材料学报

无机材料学报

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晶内型Al2O3—SiC纳米复合陶瓷的制备

王宏志; 高濂; 归林华; 郭景坤   

  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:1997-03-25 修回日期:1997-05-12 出版日期:1997-10-20 网络出版日期:1997-10-20

Processing and Microstructure of Intragranular Al2O3-SiC Nanocomposites

WANG Hongzhi; GAO Lian; GUI Linhua; GUO Jingkun   

  1. The State Key Lab on High Performance Ceramics and Suprefine Microstructure; Shanghai Institute ofCeramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-03-25 Revised:1997-05-12 Published:1997-10-20 Online:1997-10-20

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摘要： 研究了沉淀法制备Al2O3－SiC纳米复合陶瓷的工艺过程，利用Al2O3从，γ相到α相的蠕虫状生长过程，使大部分纳米SiC颗粒位于Al2O3晶粒内．用沉淀法制得的、含有5vol％SiC的Al2O3－SiC纳米复合陶瓷，其强度为467MPa，韧性为4．7MPa·m1/2，与一般的Al2O3陶瓷相比有较大的提高，显示了沉淀法制备Al2O3－SiC纳米复合陶瓷的优点．

关键词: 沉淀法, 纳米复合陶瓷, 氧化铝

Abstract: Al2O3-5vol% SiC nanoscale composite powder was prepared by the precipitation method.Al2O3-SiC nanocomposites were made by HP sintering. The strength of Al2O3-SiC nanocomposites is 467MPa, toughniess is 4. 7MPa.m1/2. Nano SiC particles were located in Al2O3 grains because of the transformation of Al2O3 from γ phase to α phase. This intragranular microstructure is effective in improving mechanical properties. Therefore, the precipitation method is a good way to fabricate Al2O3-SiC nanocomposites.

Key words: precipitation mothod, nanocomposites, alumina