A detection method of cmas in thermal barrier coatings based on terahertz spectroscopy

Abstract

The invention provides a detection method of CMAS in thermal barrier coatings based on terahertz spectroscopy, comprising: preparing a group of thermal barrier coating samples that are not corroded by CMAS and N groups of thermal barrier coating samples that are corroded by CMAS in different degrees, and N is at least 2 and N is a positive integer; select one of the thermal barrier coating samples for terahertz spectrum testing; calculate the optical characteristic parameters of the thermal barrier coating samples in the terahertz frequency band; repeat the above steps for the remaining thermal barrier coating samples , analyze the change law of the optical characteristic parameters of the thermal barrier coating samples not corroded by CMAS and those corroded by CMAS with different degrees in the terahertz frequency band; repeat the above steps for the sample to be tested, and judge whether the sample to be tested is affected by CMAS Corrosion and degree of corrosion. The invention can realize high-efficiency non-destructive detection of CMAS in the thermal barrier coating, and has the advantages of not destroying or polluting samples, simple and convenient data processing process, high detection result precision, no radiation in the detection process, and safety to human bodies.

Description

technical field [0001] The invention relates to the field of detection of CMAS in thermal barrier coatings, in particular to a detection method for CMAS in thermal barrier coatings based on terahertz spectroscopy. [0002] technical background [0003] Thermal barrier coatings are widely used in the protection of hot-end parts of aero-engines and gas turbines. With the continuous improvement of the thrust-to-weight ratio of aero-engines and the efficiency of gas turbines, plasma spraying and electron beam physical vapor deposition of yttrium oxide partially stabilized zirconia (YSZ) thermal barriers Coatings have become a key technology in the manufacture of high-temperature components in advanced aero-engines and gas turbines. During the flight of the aircraft, the engine inevitably inhales Ca, Mg, Al, and Si mixed oxide particles (CMAS) from the outside, and adheres to the surface coating of the blade, melts and penetrates into the ceramic layer at high temperature, making ...

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Problems solved by technology

[0011] Data processing in terahertz technology has certain complexity. It is not clear whether the terahertz detection results are affected by the degree of corrosion of CMAS, and there is no technology that uses terahertz technology to detect CMAS

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