Kinetics and mechanism of isothermal oxidation of compositionally graded yttria stabilized zirconia (YSZ) based thermal barrier coating

Subhasisa Nath, Indranil Manna, Jyotsna Dutta Majumdar

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    Abstract

    The present study concerns studying the isothermal oxidation behavior of compositionally graded thermal barrier coating (TBC) consisting of 100% CoNiCrAlY as bond coat developed by high velocity oxyfuel (HVOF) spraying on Inconel 718 substrate followed by several layers of CoNiCrAlY and YSZ in the weight ratios of 70:30, 50:50, 30:70, and 0:100 by plasma spraying. The kinetics of growth of the thermally grown oxide (TGO) layer developed due to oxidation of compositionally graded TBC was compared to the same grown during oxidation of conventional duplex TBC. The mechanism of oxidation was established. The residual stress developed on the surface before and after oxidation was studied in details.
    Original languageEnglish
    Pages (from-to)10-22
    Number of pages13
    JournalCorrosion Science
    Volume88
    Early online date11 Jul 2014
    DOIs
    Publication statusPublished - Nov 2014

    Keywords

    • A: Ceramic
    • A: Superalloys
    • B: XRD
    • B: SEM
    • C: Oxidation

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