Debonding defect rapid detection line laser scanning thermal wave imaging method for TBC

Abstract

The present application discloses a debonding defect rapid detection line laser scanning thermal wave imaging method for TBC. The method comprises: optimizing and designing fast-moving line laser line as a linear heat source, carrying out scanning excitation on the surface of a TBC sample by using the linear heat source, carrying out large range linear rapid scanning on the sample surface at a coarse scanning detection stage, collecting to obtain the thermal infrared image at the coarse scanning detection stage, and carrying out thermal infrared image analysis; and carrying out fine scanning on the defect-suspected micro-region to obtain the thermal infrared image at the fine scanning detection stage. With the method of the present invention, the debonding defect of TBC can be detected, the high precision is provided, damage on the TBC during the detection can not be generated, the operation is simple, the high efficiency is provided, and the image collected by the system can be post-treated.

Description

technical field [0001] The application relates to the technical field of non-destructive testing and image processing in experimental mechanics, and in particular relates to a line laser scanning thermal wave imaging method suitable for rapid detection of TBC debonding defects. Background technique [0002] Turbine blades are usually made of directionally solidified alloys and single crystal alloys, and the service temperature can only reach 1000°C, which cannot meet the operating temperature requirements of modern engines. In response to this situation, people have developed TBC to protect the metal base. The engine turbine blades coated with TBC can operate at a high temperature of 1600 ° C, improve the thermal efficiency of the engine by more than 60%, and effectively increase the thrust-to-weight ratio. TBC-coated turbine blades are a typical multi-layer structure system, usually composed of a substrate, an intermediate transition layer, and a ceramic layer. Each layer h...

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Problems solved by technology

[0006] One step closer, regarding the infrared thermal imaging non-destructive testing system of thermal barrier coatings, the invention and creation name of Chinese patent application number 201420723314.7 (publication number CN204203143U, the publication date is March 11, 2015) is: New thermal barrier coating structure Optical infrared thermal wave detection device, the application discloses a new type of optical infrared thermal wave detection device with thermal barrier coating structure, using high-energy flash pulse heating lamp as thermal excitation, infrared thermal imager to collect images, but does not propose detection defects Sensitivity and resolution issues, and did not mention the post-processing method of the collected images

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