FORMATIVE MECHANISM OF THERMAL SHOCK FATIGUE CRACK OF CERMETS
-
摘要: 研究了金属陶瓷热冲击疲劳特性, 重点探讨了裂纹的形成机制。试验结果表明, 随着循环温度的增高, 裂纹形核孕育期缩短, 裂纹扩展速率增大; 随着金属陶瓷中金属相含量的增加, 裂纹扩展速率降低。热冲击疲劳裂纹的形成与微孔洞的形核、长大和连通有关。研究还发现, 金属陶瓷热冲击疲劳断口中存在疲劳条纹。Abstract: The thermal shock fatigue character of cermets has been studied and the formative mechanism of crack discussed in detail. The results have shown that the incubation period of crack nucleation decreases and the propagation rate of crack increases with increasing the cyclic temperature. The propagation rate of crack also decreases with increasing the binder content of cermets. The crack formation of thermal shock fatigue is related to the nucleation, growth and join of microvoid. The SEM has also denoted that there are some fatigue striae on the fracture surfaces.
-
Key words:
- cermets
-
点击查看大图
计量
- 文章访问数: 1584
- PDF下载量: 1106
- 被引次数: 0
下载:
