Nondestructive testing method and system for internal cracks of thermal barrier coating

Abstract

The invention discloses a nondestructive testing method and system for internal cracks of a thermal barrier coating. The nondestructive testing method comprises the following steps of: acquiring an angle set of X-rays irradiated to the thermal barrier coating; and determining internal crack positions of the thermal barrier coating according to a lattice change state of the thermal barrier coating at different angles. According to the nondestructive testing method and the system for the internal cracks of the thermal barrier coating, the internal cracks of the thermal barrier coating are subjected to nondestructive testing by adopting an X-ray method, and the problems that the ultrasonic testing accuracy is not high, a magnetic testing method is limited by a thermal barrier coating material, and a penetration testing method cannot detect the crack state in the coating are solved.

Description

technical field [0001] The invention relates to the technical field of crack detection, in particular to a method and system for non-destructive detection of internal cracks in a thermal barrier coating. Background technique [0002] Thermal barrier coating is a layer of ceramic coating, which is deposited on the surface of high-temperature resistant metals or superalloys. The thermal barrier coating acts as a heat insulator for the base material and reduces the temperature of the base, making devices made of it (such as engines Turbine blades) can operate at high temperatures and can increase the thermal efficiency of devices such as engines to over 60%. Non-destructive testing refers to the use of changes in thermal, sound, light, electricity, magnetic and other reactions caused by abnormal internal structures or defects of materials without damaging or affecting the performance of the tested object and the internal organization of the tested object. , by means of physica...

AI Technical Summary

Problems solved by technology

Ultrasonic testing uses the action of ultrasonic waves and defects to detect, and the coating system itself is a porous structure, no matter the coating prepared by APS or the coating prepared by Electron Beam-Physical Vapor Deposition (EB-PVD), Its structure contains a large number of cracks or holes, so the accuracy of ultrasonic detection of coating cracks is not high

The magnetic detection method requires the sample to be magnetic, but the most commonly used yttria stabilized zirconia (Yttria Stabilized Zirconia, YSZ) thermal barrier coating itself is not magnetic enough to meet the detection conditions.

Penetration testing is mainly used when there are cracks on the surface, and the state of cracks in the coating cannot be detected.

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