Non-destructive microwave detection of layer thickness in degraded thermal barrier coatings using K- and W-band frequency range

M. Sayar, D. Seo, K. Ogawa

研究成果: Article査読

33 被引用数 (Scopus)

抄録

Thermal barrier coatings have been widely used in gas turbine engines in order to protect the substrate metal alloy against high temperature and to enhance turbine efficiency. To monitor thermal barrier coating (TBC) integrity over its lifetime, the detection of top coat (TC) and thermally grown oxide (TGO) thicknesses was carried out using a microwave non-destructive technique. The results showed a good resolution of 1° change in phase for 15 μm TC thickness when a rectangular waveguide operating at relatively high frequency was applied. 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.

本文言語English
ページ(範囲)398-403
ページ数6
ジャーナルNDT and E International
42
5
DOI
出版ステータスPublished - 2009 7月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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