热障涂层界面脱粘缺陷的脉冲红外热成像检测

doi:10.7527/S1000-6893.2019.22895

Abstract

Abstract: This paper aims at soloving the nondestructive testing problem of interface debonding defect of thermal barrier coatings. Firstly, a preparing method for specimen with artificial debonding defects is proposed, providing more realistic thermal conduction process and controllable defect size. On this basis, pulsed thermography is employed to detect the coating specimen with artificial debonding defect, and the transient response process of the surface temperatures in debonding region and sound region of coating interface is analyzed. Standard Deviation (SD) and Normalized Contrast (NC) are used as evaluation criteria to quantitatively compare the effects of three typical thermal image reconstruction methods, which are PPT, PCA, and TSR, in the identification of debonding defects. The results indicate that, for YSZ thermal barrier coatings with a thickness of 400 μm, the debonding defects with a minimum diameter of 4 mm can be identified in raw thermal image sequency, while the debonding defects with a minimum diameter of 2 mm can be identified in all three reconstructed image sequences. The identificating ability of debonding defects have significantly improved by three reconstruction algorithms, among which the TSR reconstruction algorithm provided the best noise suppression ability for thermal image sequence.

Key words: thermal barrier coating, interface debonding, pulsed thermography, thermal image reconstruction, thermal signal reconstruction

CLC Number:

V250.2

DONG Lihong, GUO Wei, WANG Haidou, XING Zhiguo, FENG Fuzhou, WANG Bozheng, GAO Zhifeng. Inspection of interface debonding in thermal barrier coatings using pulsed thermography[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(8): 422895-422895.

References 25

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Inspection of interface debonding in thermal barrier coatings using pulsed thermography

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