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无机材料学报

无机材料学报

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高温等静压烧结碳化硅基复相陶瓷的强化与增韧

董绍明; 江东亮; 谭寿洪; 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:1998-04-13 修回日期:1998-05-21 出版日期:1999-02-20 网络出版日期:1999-02-20

Strengthening and Toughening of Hot Isostatically Pressed SiC Based Composites

DONG Shao-Ming; JIANG Dong-Liang; TAN Shou-Hong; GUO Jing-Kun   

  1. State Key Lab of high Pedermance Ceramics and Superfine Microstructure; Shanghai Institute ofCeramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-04-13 Revised:1998-05-21 Published:1999-02-20 Online:1999-02-20

PDF (PC)

889

被引次数

22

摘要： 本文通过Si3N4、TiC及SiC晶须补强SiC基复相陶瓷的高温等静压烧结，研究了复相陶瓷的显微结构与力学性能，探讨了晶须及第二相颗粒对复相陶瓷的强化与增韧机理．结果表明，不同的补强颗粒及晶须在基体中的作用也不同，Si3N4的引入将在基体与第二相颗粒之间产生径向压应力，阻碍裂纹的扩展，TiC的引入将在基体与第二相颗粒之间产生径向张应力，诱导裂纹的偏转；SiC晶须的引入也将产生阻碍裂纹扩展的机制，从而达到SiC基复相陶瓷强化与增韧，改善其力学性能．

关键词: 高温等静压, 复相陶瓷, 强化与增韧, 显微结构, 力学性能

Abstract: Si3N4, TiC and SiC whisker reinforced SiC matrix composites were Hot Isostatically Pressed, and the microstructure and mechanical
properties were studied. The strengthening and toughening mechanisms are different depending on the incorporation of second phase. Si3N4 in
the matrix may induce the radius compressive force because of the difference of thermal expansion coefficient and elastic modulus. As
a result, the crack propagation will be hindered. TiC in the matrix will induce the radius tension force so that the crack will be deflected.
The incorporation of SiCW can produce the composed strengthening and toughening mechanism such as crack deflection, pull out, so that both
of the strength and fracture toughness will be improved.

Key words: hot isostatic pressing, composite, strengthening and toughening, microstructure, mechanical properties

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