Development of a nondestructive evaluation technique for degraded thermal barrier coatings using microwave

M. Sayar; K. Ogawa; T. Shoji

doi:10.1063/1.2902618

Development of a nondestructive evaluation technique for degraded thermal barrier coatings using microwave

M. Sayar, K. Ogawa, T. Shoji

ENG - Fracture and Reliability Research Institute

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Thermal barrier coatings have been widely used in gas turbine engines in order to protect substrate metal alloy against high temperature and to enhance turbine efficiency. Currently, there are no reliable nondestructive techniques available to monitor TBC integrity over lifetime of the coating. Hence, to detect top coating (TC) and TGO thicknesses, a microwave nondestructive technique that utilizes a rectangular waveguide was developed. The phase of the reflection coefficient at the interface of TC and waveguide varies for different TGO and TC thicknesses. Therefore, measuring the phase of the reflection coefficient enables us to accurately calculate these thicknesses. Finally, a theoretical analysis was used to evaluate the reliability of the experimental results.

Original language	English
Title of host publication	Review of Progress in QuantitativeNondestructive Evaluation
Pages	1536-1542
Number of pages	7
DOIs	https://doi.org/10.1063/1.2902618
Publication status	Published - 2008 Mar 24
Event	34th Annual Review of Progress in Quantitative Nondestructive Evaluation - Golden, CO, United States Duration: 2007 Jul 22 → 2007 Jul 27

Publication series

Name	AIP Conference Proceedings
Volume	975
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	34th Annual Review of Progress in Quantitative Nondestructive Evaluation
Country/Territory	United States
City	Golden, CO
Period	07/7/22 → 07/7/27

Keywords

Microwave NDE
Thermal Barrier Coating
Thermally Grown Oxide
Thickness

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.2902618

Cite this

Sayar, M, Ogawa, K & Shoji, T 2008, Development of a nondestructive evaluation technique for degraded thermal barrier coatings using microwave. in Review of Progress in QuantitativeNondestructive Evaluation. AIP Conference Proceedings, vol. 975, pp. 1536-1542, 34th Annual Review of Progress in Quantitative Nondestructive Evaluation, Golden, CO, United States, 07/7/22. https://doi.org/10.1063/1.2902618

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title = "Development of a nondestructive evaluation technique for degraded thermal barrier coatings using microwave",

abstract = "Thermal barrier coatings have been widely used in gas turbine engines in order to protect substrate metal alloy against high temperature and to enhance turbine efficiency. Currently, there are no reliable nondestructive techniques available to monitor TBC integrity over lifetime of the coating. Hence, to detect top coating (TC) and TGO thicknesses, a microwave nondestructive technique that utilizes a rectangular waveguide was developed. The phase of the reflection coefficient at the interface of TC and waveguide varies for different TGO and TC thicknesses. Therefore, measuring the phase of the reflection coefficient enables us to accurately calculate these thicknesses. Finally, a theoretical analysis was used to evaluate the reliability of the experimental results.",

keywords = "Microwave NDE, Thermal Barrier Coating, Thermally Grown Oxide, Thickness",

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AU - Sayar, M.

AU - Ogawa, K.

AU - Shoji, T.

PY - 2008/3/24

Y1 - 2008/3/24

N2 - Thermal barrier coatings have been widely used in gas turbine engines in order to protect substrate metal alloy against high temperature and to enhance turbine efficiency. Currently, there are no reliable nondestructive techniques available to monitor TBC integrity over lifetime of the coating. Hence, to detect top coating (TC) and TGO thicknesses, a microwave nondestructive technique that utilizes a rectangular waveguide was developed. The phase of the reflection coefficient at the interface of TC and waveguide varies for different TGO and TC thicknesses. Therefore, measuring the phase of the reflection coefficient enables us to accurately calculate these thicknesses. Finally, a theoretical analysis was used to evaluate the reliability of the experimental results.

AB - Thermal barrier coatings have been widely used in gas turbine engines in order to protect substrate metal alloy against high temperature and to enhance turbine efficiency. Currently, there are no reliable nondestructive techniques available to monitor TBC integrity over lifetime of the coating. Hence, to detect top coating (TC) and TGO thicknesses, a microwave nondestructive technique that utilizes a rectangular waveguide was developed. The phase of the reflection coefficient at the interface of TC and waveguide varies for different TGO and TC thicknesses. Therefore, measuring the phase of the reflection coefficient enables us to accurately calculate these thicknesses. Finally, a theoretical analysis was used to evaluate the reliability of the experimental results.

KW - Microwave NDE

KW - Thermal Barrier Coating

KW - Thermally Grown Oxide

KW - Thickness

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Development of a nondestructive evaluation technique for degraded thermal barrier coatings using microwave

Abstract

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Keywords

ASJC Scopus subject areas

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