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Volume 13
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10.3390/coatings13020376
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Communication

Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy

by
Wenhan Zhao
1,
Shibin Wang
2,
Lin’an Li
2,
Delin Liu
2,
Chuanwei Li
2,* and
Zhiyong Wang
2,*
1
Department of Mechanics, Tianjin University, Tianjin 300072, China
2
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing 100094, China
*
Authors to whom correspondence should be addressed.
Coatings 2023, 13(2), 376; https://doi.org/10.3390/coatings13020376
Submission received: 9 January 2023 / Revised: 30 January 2023 / Accepted: 2 February 2023 / Published: 7 February 2023
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Abstract

This paper presents a method to simultaneously measure the thickness and refractive index of the thermally grown oxide (TGO) in thermal barrier coating (TBC) by using a reflective terahertz time-domain spectroscopy (THz-TDS) system. First, an optical transmission model of THz radiation in the multilayer structure of TBC is established. Owing to the different structures of TBC before and after forming the TGO layer, two different transmission models are established, respectively. Then, the experimental signals from the samples after different thermal cycles are obtained by the THz-TDS system. By fitting the experimentally measured reflected THz signals from the TBC samples to the proposed optical model using an optimization algorithm, the thickness and refractive index of the TGO are determined. In this work, four samples with different thicknesses of TGO layers are analyzed. The results of thickness of TGO layer are verified by SEM observation, and a reasonable agreement is obtained.
Keywords: non-destructive; thermal barrier coatings; terahertz time-domain spectroscopy; thermally grown oxide; optimization algorithm; SEM observation non-destructive; thermal barrier coatings; terahertz time-domain spectroscopy; thermally grown oxide; optimization algorithm; SEM observation

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MDPI and ACS Style

Zhao, W.; Wang, S.; Li, L.; Liu, D.; Li, C.; Wang, Z. Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy. Coatings 2023, 13, 376. https://doi.org/10.3390/coatings13020376

AMA Style

Zhao W, Wang S, Li L, Liu D, Li C, Wang Z. Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy. Coatings. 2023; 13(2):376. https://doi.org/10.3390/coatings13020376

Chicago/Turabian Style

Zhao, Wenhan, Shibin Wang, Lin’an Li, Delin Liu, Chuanwei Li, and Zhiyong Wang. 2023. "Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy" Coatings 13, no. 2: 376. https://doi.org/10.3390/coatings13020376

APA Style

Zhao, W., Wang, S., Li, L., Liu, D., Li, C., & Wang, Z. (2023). Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy. Coatings, 13(2), 376. https://doi.org/10.3390/coatings13020376

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