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为了跟踪和记录热障涂层缺陷产生、发展直至脱落的过程,对热障涂层试片组进行热循环实验,在实验前和不同实验阶段分别对各个试片进行闪光灯激励红外热像检测;对发现的可疑区进行了解剖分析,识别出微裂纹;利用含有自然缺陷和人工缺陷的试片对红外热像检测的检测能力进行了评价。结果表明:闪光灯激励红外热像检测技术能够检测出直径小于0.5mm的脱粘缺陷,还能够识别出微裂纹态,这种状态用肉眼从涂层表面无法识别;闪光灯激励红外热像检测技术不仅可用于热障涂层的缺陷检测,还有希望用于热障涂层的寿命评估。
In order to track and record the thermal barrier coating defects, develop until the process of falling off, the thermal barrier coating thermal test was carried out on the thermal barrier coating, and the flash thermal imaging was performed on each test specimen before and at different experimental stages. Anatomical analysis of the suspect areas was carried out to identify microcracks. The ability of detecting infrared thermal images was evaluated using test strips containing both natural and artificial defects. The results show that flash-activated infrared thermal imaging can detect debonding defects with diameter less than 0.5mm, and also can identify microcrack state, which can not be identified from the surface of the coating with the naked eye. The flash-activated infrared thermal imaging detection technology not only Can be used for thermal barrier coating defect detection, but also hope for thermal barrier coating life assessment.