Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 23: Postersitzung I

DS 23.35: Poster

Freitag, 4. März 2005, 16:00–18:30, Poster TU B

Raman scattering investigations of friction induced changes in DLC coatings — •Dirk Spaltmann, Thomas Schneider, Klaus Witke, Klaus-Werner Brzezinka, and Mathias Woydt — Bundesanstalt für Materialforschung und -prüfung (BAM), D-12200 Berlin

Diamond like carbon (DLC) coatings are of increasing importance for industrial applications. Therefore, various DLC coatings on 100Cr6 steel discs were tested under dry slip-rolling conditions at initial Hertzian pressures of P0=1.0 GPa. Optical microscope images showed deformations of the samples and alterations in the colouring of the DLC coatings. In order to investigate these changes, Raman scattering spectroscopy was applied. Comparing the changes in the graphite (G) peak and the disordered graphite (D) peak of the Raman spectra taken of the virgin surface and of the surface after the slip-rolling test, a friction induced amorphisation of the coating, a rubbing-off of the coating or the formation of iron oxides could be observed. It depends on the type of DLC coating, which effect dominates.