Kinetics of Self-Crack-Healing of Alumina/Silicon Carbide Composite Including Oxygen Partial Pressure Effect
Kinetics of Self-Crack-Healing of Alumina/Silicon Carbide Composite Including Oxygen Partial Pressure Effect
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DOI：
10.1111/j.1551-2916.2009.02992.x
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发表时间：
2009-04-01
影响因子：
3.9
通讯作者：
Ando, Kotoji
中科院分区：
文献类型：
--
作者：
Osada, Toshio;Nakao, Wataru;Ando, Kotoji
在具有低氧分压P-O2的燃烧气体气氛下的自裂纹愈合行为对于实现陶瓷燃气轮机是重要的，但迄今为止仅研究了空气中的自裂纹愈合行为。在这项研究中，我们研究了裂纹愈合行为在1273-1773 K下的几个水平的P-O2。在P-O_2>= 50.0 Pa的气氛中裂纹愈合引起裂纹试样的强度完全恢复，这是被动氧化的结果。基于所获得的结果，通过自裂纹愈合的强度恢复的动力学被表示为愈合温度、TH（K）和P-O2（Pa）的函数。裂纹完全愈合的强度恢复率H-nu（s（-1））可表示为H-nu =6.95 × 10（5）exp（-4.65 × 10（4）/T-H）P-O 2（0.835）。利用该速率方程，可估算燃气涡轮机中在燃烧气体下完全恢复强度的愈合时间。
Self-crack-healing behavior under a combustion gas atmosphere with a low oxygen partial pressure, P-O2, is important for actualizing ceramic gas turbines, but to date only self-crack-healing behavior in air has been investigated. In this study, we investigated crack-healing behaviors at 1273-1773 K under several levels of P-O2. Crack-healing in atmospheres with P-O2 >= 50.0 Pa gave rise to the complete strength recovery of cracked specimens, resulting from passive oxidation. Based on the obtained results, the kinetics for strength recovery by self-crack-healing was expressed as a function of healing temperature, TH (K), and P-O2 (Pa). The strength recovery rate for complete crack-healing, H-nu (s(-1)), could be expressed asH-nu=6.95 x 10(5)exp(-4.65 x 10(4)/T-H)P-O2(0.835)Using this rate equation, one can evaluate the healing time for complete strength recovery under combustion gas in a gas turbine.