Research on damage behavior of thermal barrier coatings based on acoustic emission technology

Wen, Feijuan; Long, Zhang; Xing, Zhiguo; Guo, Wenyue; Huang, Yudong

doi:10.1080/10589759.2022.2066665

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…As the core component of the aircraft, the engine works at an internal temperature of more than 1600 • C and even up to 2000 • C during operation [1]. Therefore, the blades of the engine need to be made of special materials, which can withstand high temperatures and high pressure and have good stability.…”

Section: Introductionmentioning

confidence: 99%

Combined Terahertz Pulsed Imaging and Optical Coherence Tomography Detection Method for Multiple Defects in Thermal Barrier Coatings

Luo,

Zhong,

Huang

et al. 2024

Coatings

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While thermal barrier coatings (TBCs) are being sprayed onto aero-engine turbine blades, or while the engine blade is working, high temperatures and strong impact forces will damage TBCs under thermal cycles, resulting in the coating peeling off from the blades. The current method of using ECT, IRT, or another method alone cannot achieve the real-time detection of coating defects with both high precision and high penetration power. Two detection methods, namely, terahertz pulsed imaging (TPI) and optical coherence tomography (OCT), were combined to evaluate typical defects observed in TBCs (including internal debonding cracks, surface high-temperature cracks, and surface etched cracks). The results showed that the OCT system successfully obtained the micron-level axial resolution, but the detection depth of the OCT system was limited. The TPI system achieved a higher penetration depth than OCT—hence, it can be used for the nondestructive detection and evaluation of the internal debonding defects in the sample—but its resolution needs to be improved. Following this conclusion, a method is proposed using TPI and OCT concurrently for the nondestructive testing and quantitative evaluation of TBCs on etched cracks, thus achieving progress both in terms of depth and resolution. In our experiment, defects with a depth of 519 μm and a width of 100 μm were measured. The proposed method is suitable for situations where multiple defects in TBC samples of blades need to be detected simultaneously during the working process. When there are defects deep inside the sample, more small cracks on the surface can be evaluated to achieve a combination of depth and accuracy.

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Section: Introductionmentioning

confidence: 99%