Title

Evaluation of thickness, porosity and pore shape of plasma sprayed TBC by electrochemical impedance spectroscopy

Authors

Authors

J. Zhang;V. Desai

Comments

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Abbreviated Journal Title

Surf. Coat. Technol.

Keywords

impedance spectroscopy; porosity; thickness; plasma spraying; zirconium; oxide; thermal barrier coating; THERMAL BARRIER COATINGS; YTTRIA-STABILIZED ZIRCONIA; ORGANIC COATINGS; NONDESTRUCTIVE EVALUATION; AC-IMPEDANCE; BOND-COAT; NICKEL; ELECTRODEPOSITION; PASSIVATION MECHANISM; ELECTRICAL-PROPERTIES; ELECTRONIC TRANSPORT; Materials Science, Coatings & Films; Physics, Applied

Abstract

An equivalent circuit of electrochemical impedance spectroscopy (EIS) was suggested to model the morphological structure of nonexposure thermal barrier coating (TBC). The morphological properties of as-coated air plasma sprayed (APS) TBC were correlated with the EIS parameters. A linear relationship between TBC topcoat thickness, D-c, and ceramic resistance, R-c, has been found particularly When the TBC have the same porosity. The TBC porosity, P, shows to be a function of ceramic thickness, D-c, and porosity, P; in particular, it shows a proportional relationship with ceramic capacitance, C-c, when ceramic thickness, D-c, is kept unchanged. The pore size and shape in the TBC topcoat can be assessed by the pore resistance, R-p, as measured by EIS. The results indicate that electrochemical impedance spectroscopy can be used for quality assurance of TBC and, in particular, to evaluate TBC ceramic topcoat thickness, porosity and kinds of defects. (C) 2004 Elsevier B.V. All rights reserved.

Journal Title

Surface & Coatings Technology

Volume

190

Issue/Number

1

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

98

Last Page

109

WOS Identifier

WOS:000225305300014

ISSN

0257-8972

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