System and method for testing failure of thermal barrier coating

Abstract

The invention provides a system and a method for testing the failure of a thermal barrier coating. The system comprises a high-temperature and high-thermal-flux circulating thermal inspection device which is used for detecting the thermal impact life of the coating and is provided with a fixing unit for fixing a coating test sample and a heating unit for cyclically heating the coating test sample, an acoustic emission signal detection device which is used for coating failure and is provided with an acoustic emission sensor for detecting an acoustic emission signal in the coating failing process, and an acoustic emission signal processing unit for receiving and processing the acoustic emission signal from the acoustic emission sensor to forecast a coating destroy critical time point in advance. The system is used for dynamically and non-destructively monitoring the failure of the thermal barrier coating in situ, in real time and on line under the condition of high-temperature and high-thermal-flux circulating thermal impact.

Description

technical field [0001] The present invention relates to the field of performance testing of thermal barrier coatings, in particular, to a testing system and method for thermal barrier coating failure, especially to a thermal barrier coating failure test method for high temperature and high heat flux density cycle thermal shock conditions. A combined test system and test method for in-situ dynamic non-destructive real-time online monitoring. Background technique [0002] The failure of thermal barrier coatings under high temperature conditions has always been a key topic in the research of thermal barrier coatings. The research on the failure modes and mechanisms of thermal barrier coatings will help to judge the failure mode and critical point of service failure of thermal barrier coatings. The failure of thermal barrier coatings under high temperature service conditions is a highly nonlinear process. Its failure mode and critical point of destruction are functions of temp...

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Problems solved by technology

[0005] Previous studies on non-destructive characterization of thermal barrier coating failure, especially AE, have mostly focused on normal temperature conditions, such as bending loads (three-point bending, four-point bending, shear), uniaxial loading (tensile Acoustic emission signal detection and analysis under conditions such as heating and compression), the acoustic emission signal detection of coating failure under high temperature conditions is mainly aimed at thermal shock failure in the form of air furnace heating-water quenching, the waveguide rod technology is mainly used to convert the waveguide The rod is welded on the side or back of the tested coating sample, usually a high-temperature alloy or stainless steel substrate, so as to detect the failure process of the coating. The disadvantage of this process is that the length of the waveguide rod is restricted by the experimental device and links, so the acoustic The emission signal will be attenuated and distorted to a certain extent, which brings great difficulties to the analysis of the acoustic emission signal, so it is not easy to judge the "source" information of the coating failure

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