Title

Post-Exposure Evaluation Of Thermal Barrier Coatings By Electrochemical Impedance Spectroscopy

Abstract

High temperature behavior of air plasma sprayed (APS) thermal barrier coatings (TBC) was investigated in this study by electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM) was used to examine cross-sectional morphology of exposed TBC. It was found that characteristic EIS spectra were obtained effectively to differentiate variant post-exposed TBC such as isothermal oxidation and cyclic oxidation. In addition, the type and length of high temperature exposure were qualitatively discernible from the EIS data. A model of an EIS alternative current (AC) equivalent circuit was proposed quantitatively to relate the EIS parameters to the morphological properties of the exposed TBC and functional relationships have been established between them. From the results, EIS has been identified capable of monitoring the microstructure of post-exposed TBC and evaluating TBC damage. © 2001 Materials Research Society.

Publication Date

12-1-2001

Publication Title

Materials Research Society Symposium Proceedings

Volume

645

Number of Pages

37-42

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

34249895903 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34249895903

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