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Post-Exposure Evaluation of Thermal Barrier Coatings by Electrochemical Impedance Spectroscopy

Published online by Cambridge University Press:  17 March 2011

Jianqi Zhang  and
Vimal Desai
Jianqi Zhang
Affiliation:
Advanced Materials Processing & Analysis Center, University of Central Florida, Orlando, FL 32816-2450, U. S. A.
Vimal Desai
Affiliation:
Advanced Materials Processing & Analysis Center, University of Central Florida, Orlando, FL 32816-2450, U. S. A.
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 645: Symposium M – Thermal Barrier Coatings-2000 , 2000 , M9.2.1
Copyright
Copyright © Materials Research Society 2001

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References

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