Impedance spectroscopy study of plasma sprayed and EB-PVD thermal barrier coatings

P. S. Anderson, X. Wang, P. Xiao

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Impedance spectroscopy (IS) and SEM/EDX were used to characterise a range of isothermally heat-treated plasma sprayed (PS) and electron beam physical vapour deposited (EB-PVD) thermal barrier coatings (TBCs). Nyquist (imaginary (Z″) vs. real (Z′) impedance) and Bode plots (phase angle (θ) vs. frequency (f)) were used to investigate the effect of variation of Ag electrode size on electrical responses, and to compare PS and EB-PVD TBCs. Various observed electrical responses relating to the Ag electrode size effect, the thickness, continuous nature and purity of the TGO layer, and YSZ coating thickness, were explained using Circuit modelling. © 2004 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)106-119
    Number of pages13
    JournalSurface and Coatings Technology
    Volume185
    Issue number1
    DOIs
    Publication statusPublished - 1 Jul 2004

    Keywords

    • Electron beam physical vapour deposition (EB-PVD)
    • Impedance spectroscopy
    • Plasma sprayed (PS)
    • Thermal barrier coating (TBC)

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