Time-dependent deformation in an enhanced SiC/SiC composite

被引:0
|
作者
Shijie Zhu
Yutaka Kagawa
Jian-Wu Cao
Mineo Mizuno
机构
[1] University of Tokyo,the Institute of Industrial Science
[2] Japan Fine Ceramics Center,undefined
[3] Shanghai Jiaotong University,undefined
[4] the Japan Fine Ceramics Center,undefined
来源
Metallurgical and Materials Transactions A | 2004年 / 35卷
关键词
Material Transaction; Creep Test; Stress Exponent; Glassy Phase; Creep Strain Rate;
D O I
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中图分类号
学科分类号
摘要
Time-dependent deformation in an enhanced SiC/SiC composite has been studied under constant load at high temperatures of 1200 °C, 1300 °C, and 1400 °C. Creep damage evolution was evaluated by a Young’s-modulus change of partial unloading and microscopic observation. The addition of the glassy phase in the matrix is very effective for protecting the composite from oxidation. The transient creep is dominant in creep life at all the temperatures. An empirical equation is proposed to describe creep behavior of the composite. It is found that creep activation energy increases with creep time at stresses lower than matrix cracking stress, but the activation energy remains constant at stresses higher than the matrix cracking stress. The creep strain rate of the composite is considered to be controlled by creep of fibers based on examining the time, strain, stress, and temperature dependencies of creep strain rates.
引用
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页码:2853 / 2859
页数:6
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