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

M. Sayar, K. Ogawa, T. Shoji

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publicationReview of Progress in QuantitativeNondestructive Evaluation
Pages1536-1542
Number of pages7
DOIs
Publication statusPublished - 2008 Mar 24
Event34th Annual Review of Progress in Quantitative Nondestructive Evaluation - Golden, CO, United States
Duration: 2007 Jul 222007 Jul 27

Publication series

NameAIP Conference Proceedings
Volume975
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other34th Annual Review of Progress in Quantitative Nondestructive Evaluation
CountryUnited States
CityGolden, CO
Period07/7/2207/7/27

Keywords

  • Microwave NDE
  • Thermal Barrier Coating
  • Thermally Grown Oxide
  • Thickness

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • 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 (pp. 1536-1542). (AIP Conference Proceedings; Vol. 975). https://doi.org/10.1063/1.2902618