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Exploring the potential of Raman spectroscopy for the identification of silicone oil residue and wear scar characterization for the assessment of tribofilm functionality

2015; Elsevier BV; Volume: 90; Linguagem: Inglês

10.1016/j.triboint.2015.04.046

1879-2464

W. Österle, Andrea Mario Giovannozzi, Thomas Gradt, Ines Häusler, Andrea Mario Rossi, Bernd Wetzel, G. Zhang, А. И. Дмитриев,

Diamond and Carbon-based Materials Research

We applied a combination of Raman spectroscopy (RS) and cross-sectional transmission electron microscopy (X-TEM) to identify silicone oil residues and tribofilms at steel disc surfaces after tribological testing. Neither chemical cleaning nor mechanical removal of a 50 µm thick surface layer produced a surface without any silicone residue. Nevertheless, long-term tribological properties are not affected due to silicone degradation which has been proved by Raman spectroscopy. Excellent anti-wear and anti-friction properties of a nanocomposite at severe stressing conditions correlated with the formation of a silica-based tribofilm containing amorphous and graphite-like carbon nanoparticles. Since reliable carbon quantification by analytical TEM is difficult, RS is a useful complementary method for carbon identification at wear scars.