Abstract
Thermal barrier coatings (TBCs) are widely used on turbine engines. The failure of TBCs will lead to financial losses or even life hazards, thereby necessitating the employment of non-destructive testing (NDT) methods to ensure structural integrity and safety. The smaller size of defects that can be detected, the more likely it is to prevent potential risks. If multi-defects can be detected simultaneously, the maintenance cycles and costs will be reduced. However, current NDT methods are difficult to detect tiny debonding defects with high accuracy, and there are few methods that can detect multi-defects at the same time. To address this challenge, in this paper, combined with calculation and experiment, an electromagnetic driven based multi-physics fusion detection method is proposed for the first time. This method realizes the precise and fast detection of interfacial debonding with diameter 0.7mm within 0.8 second and the detection of substrate cracks simultaneously. To better simulate the actual debonding defects in real working conditions, the specimens with debonding defects fabricated by salt dissolution method are firstly used for the detection. The multi-physics fusion method leads to the combination of multiple NDT methods, which provides ideas for further improving the detection accuracy and efficiency of multilayer coatings.