Device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation

Abstract

The invention discloses a device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation. The device comprises area array pulse laser, a thermal infrared imager, an industrial control computer, a lead screw, a sliding rail, a plate clamping device, an infrared thermal imager clamping device, a human-computer interaction interface, a thermal-dissipating air box and a switch. The method adopts the low-power area array pulse laser to conduct thermal excitation on a to-be-detected coating part, a small-size coating part serves as an object, temperature information of the to-be-detected coating part is collected through the thermal infrared imager, the surface temperature change function is fitted in the computer, then the coating thickness anddefect situations are calculated, meanwhile, the human-computer interaction interface is utilized to control the lead screw and the sliding rail to realize free moving and precise positioning of thethermal infrared imager in the three-dimensional direction, and non-destructive detection precision is greatly improved. The device and method adopt area array pulse laser excitation, short-cycle pulse heating is formed on the surface of the TBC surfaces, and detecting is conducted in the mode of not damaging the material surface, and meanwhile, the device and method have the advantages that non-contact performance is achieved, the scanning speed is high, the efficiency is high, the beam radiation angle is small, adjusting of liftoff is more accurate, positioning shooting of the thermal infrared imager is more accurate, operation is more convenient and quick, the safety is higher, and the price is low.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal wave non-destructive testing, and in particular relates to a device and method for detecting a thermal barrier coating surface based on an area array pulsed laser excitation. Background technique [0002] Thermal Barrier Coating (TBCs for short) is one of the most advanced high-temperature protective coatings at present. It has good heat insulation effect and oxidation resistance, and is widely used in gas turbine hot passage parts such as turbine blades and combustion chambers. Waiting for surface protection. Thermal barrier coatings generally have a double-layer structure, consisting of a surface ceramic layer and an inner metal bonding layer. The thickness is a key technical indicator characterizing the quality of thermal barrier coatings, which is related to the service life, bonding strength, and Evaluation and calculation of uniform internal stress and manufacturing cost, etc. The...

AI Technical Summary

Problems solved by technology

The power of semiconductor laser can reach very high, but the output of semiconductor laser is generally a point light source, the power density is very high, and it is easy to damage the surface of the material, so it is not suitable to be directly used as a thermal excitation source for infrared thermal wave nondestructive testing technology

[0006] In summary, there are many problems in the existing non-destructive testing technology of thermal barrier coatings, and the detection speed cannot be improved very well. It is urgent for scientific and technological workers to research and develop a non-destructive testing of thermal barrier coatings with higher intelligence and more convenient operation. , the safety is guaranteed, the detection speed is faster, and the price is cheaper

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