Microstructure control of thermally sprayed co-based self-fluxing alloy coatings by diffusion treatment

Kazunori Sakata, Kosuke Nakano, Hirofumi Miyahara, Yasuhiro Matsubara, Keisaku Ogi

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    11 Citations (Scopus)


    This article describes microstructure control aimed for wear-resistance improvement of Co-based (Co-Cr-W-B-Si) self-fluxing alloy coating by diffusion treatment. The diffusion treatments of thermally sprayed Co-based self-fluxing alloy coating on steel substrate were carried out at 1370-1450 K for 600-6000 s under an Ar gas atmosphere. Microstructural variations of the coating and the interface between the substrate and the coating were investigated in detail. A proper diffusion treatment precipitates two kinds of fine compounds in Co-based matrix. X-ray diffractometer (XRD) and electron probe microanalyzer (EPMA) analysis revealed these precipitates to be a chromium boride dissolving cobalt and a tungsten boride containing cobalt and chromium. The size of each precipitate became larger with increasing treatment temperature and time. A coating with the proper size borides showed a superior wear-resistance.

    Original languageEnglish
    Pages (from-to)991-997
    Number of pages7
    JournalJournal of Thermal Spray Technology
    Issue number5-6
    Publication statusPublished - Dec 2007

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Materials Chemistry


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