Failure detection of thermal barrier coatings using impedance spectroscopy

N. Q. Wu, Kazuhiro Ogawa, Minking Chyu, Scott X. Mao

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


Electrochemical impedance spectroscopy and microstructural evolution of thermal barrier coatings have been studied. The results of impedance spectroscopy measurement were fit to an idealized model circuit, which represents the physical behavior of thermal barrier coatings. Impedance spectroscopy was sensitive to defects such as cracks within yttria-stabilized zirconia coatings, and growth of thermally grown oxide film between the top coating and the bond coating. The experimental results provide a basis for the application of impedance spectroscopy in non-destructive evaluation of thermal barrier coatings.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalThin Solid Films
Issue number2
Publication statusPublished - 2004 Jun 15


  • Coatings
  • Corrosion
  • Electrical properties and measurements
  • Oxidation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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