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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

SiO2-Si3N4复合材料的力学性能及其增韧机理

姚俊杰; 李包顺; 黄校先; 郭景坤   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1996-01-05 修回日期:1996-01-29 出版日期:1997-02-20 网络出版日期:1997-02-20

Mechanical Properties and Toughening Mechanism of SiO2-Si3N4 Composite

YAO Junjie; LI Baoshun; HUANG Xiaoxian; GUO Jingkun   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-01-05 Revised:1996-01-29 Published:1997-02-20 Online:1997-02-20

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摘要： 采用热压工艺制备了SiO2－Si3N4复合材料，其抗弯强度和断裂韧性达到143MPa和1.7MPa·m1／2.比基体SiO2材料分别提高107％和70％.复合材料性能的改善是由于高弹性模量的Si3N4引入以及SiO2和Si3N4热膨胀系数不匹配导致的残余应力.

关键词: 石英, 氮化硅, 复合材料, 增韧机理

Abstract: SiO2-Si3N4 composites were prepared by hot pressing process. Their flexural strength and fracture toughness obtained are 143MPa and 1.7MPa.m1/2, which are 107% and 70% higherthan those of the SiO2 matrix material respectively. The addition of higher elastic modulus Si3N4 particulates and the residual stress caused by the difference in thermal expansion coefficient of Si3N4 and SiO2 are the main reason responsible for the improvement of mechanical properties of the composites.

Key words: silica, silicon nitride, composite, toughening mechanism