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Thermal barrier coatings (TBCs) in gas turbine engines are used in expressly harsh environments; thus, assessing TBC integrity status is critical for safety and reliability. However, traditional periodic maintenance involves visual inspections of the TBCs, requiring the gas turbine to be decommissioned and partially dismantled. Most importantly, tiny defects or internal damages that easily cause coating failure cannot be identified. In this work, a new nondestructive evaluation (NDE) technique of TBCs based on quantum dot (QD) anion exchange is first explored internationally. By exchanging anions between the Cl ions and the CsPbBr3 QDs, the degrees of salt corrosion of the TBCs are evaluated. The resultant NDE technique shows that the colour of the TBCs obviously changes from green to blue, accompanied by a large blueshift (~ 100 nm) of the photoluminescence (PL) peak position. In addition, the relationship between the PL peak position and coating thermophysical properties indicates that the precision of this NDE technique may easily identify the μm-level of the thermal growth oxide (TGO) changes inside the TBCs.

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Publication history
Copyright
Acknowledgements

Publication history

Received: 30 August 2023
Revised: 12 November 2023
Accepted: 21 November 2023
Published: 12 January 2024
Issue date: May 2024

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

T. H. acknowleges support form the Science and Technology Innovation Program of Hunan Province (No. 2022RC1098), the Hunan Provincial Natural Science Foundation of China (Nos. 2023JJ30563 and 2019JJ50565), the Scientific Research Fund of Hunan Provincial Education Department (Nos. 22A0580 and 18A461), the Scientific Research Start-up Fund for High-level Talents in Xiangnan University. The work of X. F. Z. is supported by the National Natural Science Foundation of China (Nos. 51801034 and 52172067), the Natural Science Foundation of Guangdong Province (Nos. 2021B1515020038 and 2020B1515020036), and the Guangdong Special Support Program (No. 2019BT02C629). The work of S. F. D. is supported by the Scientific Research Fund of Hunan Provincial Education Department (No. 19C1706) and the Scientific Research Fund of Chenzhou (No. zdyf201907).

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