Structure and method for accurately measuring stress in thermal barrier coating

Abstract

The invention relates to a structure and a method for accurately measuring stress in a thermal barrier coating. The structure comprises a high temperature alloy layer, wherein the high temperature alloy layer is coated with a bonding layer; the bonding layer is coated with a piezoelectric ceramic film; the piezoelectric ceramic film is coated with a ceramic layer; the bonding layer is an MCrAlY bonding layer which is oxidized to form an Al2O3 protective layer after being used for a long time; the piezoelectric ceramic film is a lead zirconate titanate (PZT) piezoelectric ceramic film; and theceramic layer is an yttria stabilized zirconia (YSZ) ceramic layer. By the structure and the method, the stress in the thermal barrier coating can be accurately measured, so that the service life of the coating can be predicted, the thermal barrier coating can be timely replaced, and safe accidents are reduced.

Description

technical field [0001] The invention relates to a coating for accurately measuring stress in a thermal barrier coating, belongs to the field of novel coating structures and stress measurement methods, and can be widely used in stress measurement of coatings. Background technique [0002] With the development of aviation gas engines towards high flow ratio and high thrust-to-weight ratio, the single use of existing metal materials can no longer meet the design and use requirements of the gas temperature and pressure of the combustion chamber. Using thermal barrier coatings (thermal barrier coatings, TBCs) can make superalloy blades work at higher temperatures. The thermal barrier coating not only has a good heat insulation effect, but also can increase the operating temperature of the engine and the corrosion resistance of the components, and prolong the service life of the hot end components. Thermal barrier coating technology has become the development direction of high te...

AI Technical Summary

Problems solved by technology

However, during the service of the thermal barrier coating, a layer of Al will be formed between the bonding layer and the ceramic layer. 2 o 3 The protective layer (TGO layer) can protect. As time goes on, the TGO layer will continue to thicken, and a huge thermal stress will be generated in the coating. When the thermal stress reaches a certain level, the coating will peel off and the coating will peel off. It will have a huge impact on the blade. Therefore, accurate measurement of the thermal stress of the coating in the thermal barrier coating system is an important issue to ensure the safe service of the coating. However, so far, no good stress measurement method has been found

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