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首页> 外文期刊>Ceramic Engineering and Science Proceedings >SELF-CRACK HEALING BEHAVIOR UNDER COMBUSTION GAS ATMOSPHERE - Self-crack-healing behavior under combustion gas atmosphere
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SELF-CRACK HEALING BEHAVIOR UNDER COMBUSTION GAS ATMOSPHERE - Self-crack-healing behavior under combustion gas atmosphere

机译：燃烧气体环境下的自裂纹修复行为-燃烧气体气氛下的自裂纹修复行为

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摘要

Self-crack-healing behavior under combustion gas atmosphere with low oxygen partial pressure, P_(O_2), 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 127.3 K - 177.3 K under several levels of P_(O_2). Crack-healing in atmospheres with P_(O_2) ≥ 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, T_H (K) and P_(O_2) (Pa). The strength recovery rate for complete crack-healing, V_H (S~(-1)), could be expressed as V_H=6.95×10~5 exp(-4.65×10~4/T_H)P_(O_2)~(0.835) Using this rate equation, one can evaluate the healing time for complete strength recovery under combustion gas in a gas turbine.
机译：低氧分压P_（O_2）的燃烧气体气氛下的自裂纹修复行为对实现陶瓷燃气轮机很重要，但迄今为止，仅研究了空气中的自裂纹修复行为。在这项研究中，我们研究了在几种P_（O_2）水平下在127.3 K-177.3 K处的裂纹愈合行为。 P_（O_2）≥50.0 Pa的气氛中的裂纹愈合可导致裂纹样品的完全强度恢复，这是由于被动氧化引起的。根据获得的结果，通过自裂纹修复恢复强度的动力学表示为愈合温度，T_H（K）和P_（O_2）（Pa）的函数。完全裂纹修复的强度恢复率V_H（S〜（-1））可以表示为V_H = 6.95×10〜5 exp（-4.65×10〜4 / T_H）P_（O_2）〜（0.835）使用这一速率方程，可以评估燃气轮机在燃烧气体下完全恢复强度的愈合时间。

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