Determining thermal conductivity of plasma sprayed TBC by electrochemical impedance spectroscopy

    Authors

    J. Zhang;V. Desai

    Comments

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    Abbreviated Journal Title

    Surf. Coat. Technol.

    Keywords

    impedance spectroscopy; conductivity; plasma spraying; sintering; zirconium oxide; thermal barrier coating; ANGLE NEUTRON-SCATTERING; BARRIER COATINGS; BOND-COAT; NONDESTRUCTIVE; EVALUATION; ELECTRONIC TRANSPORT; INTERFACIAL DAMAGE; OXIDATION; STRESSES; SPALLING FAILURE; SINGLE-CRYSTALS; HEAT-TREATMENT; Materials Science, Coatings & Films; Physics, Applied

    Abstract

    Thermal conductivity, K, of free-standing air plasma sprayed (APS) thermal barrier coatings (TBCs) after exposure at temperatures of 1100, 1200, and 1350 degreesC for 3, 10, 17, 24, and 120 h was measured using laser flash (LF) technique and differential scanning calorimeter (DSC), and correlated with the spectra of electrochemical impedance spectroscopy (EIS). High-temperature exposure of TBCs increases the thermal conductivity as well as the electrochemical conductance, C-t(T), with an increase in exposure temperature and exposure time. A linear relationship between thermal conductivity, K, and electrochemical conductance, C-t(T), has been found. The result has demonstrated that electrochemical impedance technique holds the promise enabling to assess and monitor the thermal conductivity of free-standing TBCs. (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

    90

    Last Page

    97

    WOS Identifier

    WOS:000225305300013

    ISSN

    0257-8972

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