| 引用本文: | 何箐， 吴鹏， 汪瑞军， 王伟平.模拟服役环境下热障涂层损伤趋势的红外原位检测技术[J].中国表面工程,2013,26(4):19~26 |
| HE Qing, WU Peng, WANG Rui-jun, WANG Wei-ping.Infrared Thermography In-situ Inspection for Damage Trend of TBCs in Simulated Service Environment[J].China Surface Engineering,2013,26(4):19~26 |
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| 摘要: |
| 热障涂层会显著提高航空发动机和燃气轮机的运行温度和热效率，其服役工况复杂，一旦失效后会严重影响热端部件的服役性能，甚至引发事故，因而对热障涂层内部损伤进行无损检测是十分必要的。文中利用红外热成像技术，在燃气加热、高温度梯度和冷热交替循环的模拟服役环境下对多组热障涂层的损伤趋势进行了原位检测，提出了利用红热辐射差异水平参数ΔTR表征了热障涂层内部缺陷的扩展趋势的方法。涂层内部缺陷的寿命周期可分为稳定阶段（<50%~60%热循环寿命）、热异常扩展阶段和加速失稳阶段（>80%~90%热循环寿命），在热异常扩展阶段可预判失效区域和剩余寿命，而加速失稳阶段可确定缺陷区域即将剥离失效。 |
| 关键词: 红外热成像 热障涂层 热循环 原位检测 失效预判 |
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| Infrared Thermography In-situ Inspection for Damage Trend of TBCs in Simulated Service Environment |
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HE Qing, WU Peng, WANG Rui-jun, WANG Wei-ping
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Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083
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| Abstract: |
| Thermal barrier coatings (TBCs) can increase the operating temperature and efficiency for aero engine and gas turbine, which are used under complex service conditions, and the failure of coating may result in serious damage for hot section parts. A nondestructive method for damage determination is necessary for TBCs. Damage trend for TBCs is in-situ inspected by infrared thermography in simulated service environment with high thermal gradient and heating-cooling cycle. The parameter of diversity factor of infrared radiation (ΔTR) is used to characterize the expansion trend of internal defects of TBCs. Thermal cycle life of defects in coating consists of steady stage (<50%-60% total cycles), thermal anomaly extend stage and acceleration unstable stage (>80%-90% total cycles). During the period of 50%-60% cycle life of defect, the spallation area and remaining life can be predicted. Acceleration unstable stage can be determined to be stripped of the area with defects. |
| Key words: infrared thermography thermal barrier coating thermal cycling in-situ inspection failure prediction |
