Testing for Debonding Defects of Thermal Barrier Coatings Based on Ultrasonic Feature Scan Imaging
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摘要: 基于超声特征扫描成像检测技术，提取铝硅热障涂层与基体粘接面的超声反射波参数，利用相位特征和幅值特征来判断缺陷，判断热障涂层与基体结合面是否脱粘。试验样品的涂层厚度为0.5 mm，基体厚度为1.5 mm。通过人工方法在粘接面处制作人工脱粘缺陷。成像结果表明：结合面脱粘处的回波与正常位置的回波相比，不仅回波幅值增大，相位也发生明显变化；通过相位特征和幅值特征能够准确判断出缺陷并进行成像。最后，通过金相试验验证了超声特征成像技术检测热障涂层粘接的准确性与直观性。Abstract: Based on the ultrasonic feature scan imaging and on the feature parameters of ultrasonic reflection echoes from the adhered surface of Al Si thermal barrier coating and the substrate bonding, the debonding defect of thermal barrier coating and the substrate surface can be determined by using the phase characteristics and amplitude characteristics. Samples with coating thickness of 0.5 mm and substrate thickness of 1.5 mm were under testing. The results show that the amplitude of the echo is increased and the phase is also changed obviously. The phase and amplitude characteristics can accurately determine the defects and can also be used for imaging. At last, the accuracy and the sensitivity of the ultrasonic imaging technology to detect the thermal barrier coatings are verified by metallographic experiments.
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