Effect of hydrogen on flaking of carbon films on Mo and W

K. Heinola, T. Ahlgren, W. Rydman, J. Likonen, L. Khriachtchev, J. Keinonen, C. H. Wu

    Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

    2 Citations (Scopus)


    Flaking of carbon film was studied by depositing hydrogen doped carbon films on tungsten and molybdenum substrates. Topographies of the carbon coatings were analyzed with scanning electron microscopy and three-dimension profilometer. Secondary ion mass spectrometry and Raman spectra analysis was used to determine the hydrogen concentration and the number of sp3 bonds in the films, respectively. Carbon film properties varied from tetrahedral amorphous carbon (ta-C) to hard hydrogenated amorphous carbon (a-C:H). Carbon coatings hold large residual stresses, which are released during or after deposition. Typical stress relief patterns were observed. In most samples buckling started at some dislocation or at the edge of the film and adhesion energy was deduced from the sizes of the stress relief patterns. It was observed, that carbon films were more adherent to tungsten than to molybdenum and that codeposited hydrogen had a significant effect to flaking propagation in the carbon films.

    Original languageEnglish
    Pages (from-to)63-67
    Number of pages5
    JournalPhysica Scripta T
    Publication statusPublished - 1 Dec 2004
    MoE publication typeNot Eligible
    EventInternational Topical Conference on Hydrogen in Condensed Matter - Helsinki, Finland
    Duration: 25 Jun 200328 Jun 2003


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