Room-temperature hard coating of ultrananocrystalline diamond/nonhydrogenated amorphous carbon composite films on tungsten carbide by coaxial arc plasma deposition

Hiroshi Naragino, Mohamed Egiza, Aki Tominaga, Koki Murasawa, Hidenobu Gonda, Masatoshi Sakurai, Tsuyoshi Yoshitake

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    5 Citations (Scopus)

    Abstract

    Ultrananocrystalline diamond (UNCD)/nonhydrogenated amorphous carbon (a-C) composite films were deposited on unheated WC containing Co by coaxial arc plasma deposition. The hardness of the film is 51.3 GPa, which is comparable with the highest values of hard a-C films deposited on nonbiased substrates. The deposited film is approximately 3 ?m thick, which is one order larger than that of hard a-C films. The internal compressive stress is 4.5 GPa, which is evidently smaller than that of comparably hard a-C films. The existence of a large number of grain boundaries in the UNCD/a-C film might play a role in the release of the internal stress.

    Original languageEnglish
    Article number030302
    JournalJapanese journal of applied physics
    Volume55
    Issue number3
    DOIs
    Publication statusPublished - Mar 2016

    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Physics and Astronomy(all)

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