Mitigation of Platinum Depletion in Platinum Diffused Single Phase Bond Coat on CMSX-4 Superalloy

Mingwen Bai, Ying Chen, Yongle Sun, Ping Xiao

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    1 Citation (Scopus)
    74 Downloads (Pure)

    Abstract

    Pt-diffused bond coat with a mixture of γ/γ’ phase has just been developed in the recent decades as a cheaper alternative to the Pt-enriched β-phase Aluminide bond coat that contains a higher content of Al. However, concerns are raised on the inevitable depletion of Pt near the coating interface that may endanger the component after long-term service. In this study, modified Pt-diffused bond coats with a single phase (γ or γ’) were made by applying selective etching on CMSX-4 single crystal superalloys prior to the electroplating of Pt. The single-phase bond coats show distinctive diffusion behaviour in comparison with the conventional γ/γ’ bond coat. Surprisingly, Pt remains more stable in the γ’-phase bond coat with significantly less depletion after diffusion, which implies a potential in saving a considerable amount of Pt. On the other hand, however, the depletion of Pt is more severe in the γ-phase bond coat. The mechanism that governs the diffusion behavior of Pt in the γ and γ’-phase was also discussed that mainly concerns with thermodynamic and kinetic factors.
    Original languageEnglish
    Article number669
    Number of pages13
    JournalCoatings
    Volume11
    Issue number6
    DOIs
    Publication statusPublished - 31 May 2021

    Bibliographical note

    This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

    Keywords

    • bond coat
    • platinum
    • diffusion
    • thermodynamic
    • thermal barrier coatings
    • Platinum
    • Bond coat
    • Thermal barrier coatings
    • Diffusion
    • Thermodynamic

    ASJC Scopus subject areas

    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces

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