Effects of exposure to 40MPa hydrogen on DLC films

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    This paper describes the behaviors of DLC (diamond-like carbon) films exposed to high pressure hydrogen. Two types of DLC, i.e. a-C:H (hydrogenated amorphous carbon) and ta-C (tetrahedral amorphous carbon) DLC films, were exposed to 40 MPa hydrogen at 373 K for 20 and 200 hours. Reciprocating sliding experiments were conducted with the exposed specimens. The specimens after the exposure and those after sliding tests were observed and analyzed with scanning Auger microprobe, Raman spectroscopy, dynamic-mode secondary ion mass spectroscopy and X-ray photoelectron spectroscopy. It was found that the two DLCs were partly or totally fractured at the film-substrate interface after the exposure to high pressure hydrogen. The results of the surface analyses suggested that hydrogen permeated, diffused and accumulated in the DLC films, which might be the cause of the film failure. It was also found that wear of ta-C DLC was reduced by the exposure to high pressure hydrogen.

    Original languageEnglish
    Pages (from-to)848-856
    Number of pages9
    JournalToraibarojisuto/Journal of Japanese Society of Tribologists
    Issue number12
    Publication statusPublished - 2009

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces


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