Fabrication of ultrananocrystalline diamond/nonhydrogenated amorphous carbon composite films for hard coating by coaxial arc plasma deposition

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

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Ultrananocrystalline diamond (UNCD)/nonhydrogenated amorphous carbon (a-C. composite (UNCD/a-C. films were deposited on cemented carbide (WC-Co. substrates by coaxial arc plasma deposition (CAPD). To suppress the graphitization induced by Co in the WC-Co, the film deposition was carried out on unheated substrates. The hardness and Young’s modulus were 51.3 GPa and 520.2 GPa, respectively. These values are comparable or rather larger than those of UNCD/a-C films deposited on other substrates such as Si, which implies that the graphitization of UNCD/a-C hardly occurs. Surprisingly, UNCD/a-C films could be deposited at the maximum film thickness of approximately 3 μm in spite of the room temperature growth. The internal compress-stress of the film is approximately 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 films, which is structural specific to UNCD/a-C, might play an important role in the release of an internal stress in the film. It was experimentally demonstrated that UNCD/a-C films prepared by CAPD are potential hard coating materials for WC-Co.

    Original languageEnglish
    Pages (from-to)1-5
    Number of pages5
    JournalEvergreen
    Volume3
    Issue number1
    DOIs
    Publication statusPublished - Jan 1 2016

    Fingerprint

    Plasma deposition
    Hard coatings
    Diamond
    Carbon films
    Amorphous carbon
    Composite films
    diamond
    Diamonds
    coating
    plasma
    Fabrication
    carbon
    Graphitization
    graphitization
    Residual stresses
    Substrates
    substrate
    Growth temperature
    Young modulus
    Carbides

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Surfaces, Coatings and Films
    • Management, Monitoring, Policy and Law

    Cite this

    Fabrication of ultrananocrystalline diamond/nonhydrogenated amorphous carbon composite films for hard coating by coaxial arc plasma deposition. / Naragino, Hiroshi; Egiza, Mohamed; Tominaga, Aki; Murasawa, Koki; Gonda, Hidenobu; Sakurai, Masatoshi; Yoshitake, Tsuyoshi.

    In: Evergreen, Vol. 3, No. 1, 01.01.2016, p. 1-5.

    Research output: Contribution to journalArticle

    Naragino, Hiroshi ; Egiza, Mohamed ; Tominaga, Aki ; Murasawa, Koki ; Gonda, Hidenobu ; Sakurai, Masatoshi ; Yoshitake, Tsuyoshi. / Fabrication of ultrananocrystalline diamond/nonhydrogenated amorphous carbon composite films for hard coating by coaxial arc plasma deposition. In: Evergreen. 2016 ; Vol. 3, No. 1. pp. 1-5.
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