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

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

    研究成果: ジャーナルへの寄稿学術誌査読

    9 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)991-997
    ページ数7
    ジャーナルJournal of Thermal Spray Technology
    16
    5-6
    DOI
    出版ステータス出版済み - 12月 2007

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 表面、皮膜および薄膜
    • 材料化学

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