Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Poster: Tribology and Misc.
O 85.3: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Indication of worn WC/C surface locations of a dry-running twin-screw rotor by the oxygen incorporation in tungsten-related Raman modes — •Henning Moldenhauer1, Jörg Debus1, Janina J. Schindler1, Philipp Waldkirch1, Sebastian Goeke2, Andreas Brümmer3, Dirk Biermann2, and Manfred Bayer1 — 1Experimental Physics 2, TU Dortmund University, 44227 Dortmund, Germany — 2Institute of Machining Technology, TU Dortmund University, 44227 Dortmund, Germany — 3Chair of Fluidics, TU Dortmund University, 44227 Dortmund, Germany
Enhancing the lifetime of mechanical parts in industrial processes is a major goal. The key to enhancement is a tribological layer of several tens of namometer thickness that forms at the surface of the mechanical part. These surface changes during wearing have to be understood. This is done by identifying the composition of the tribological layer and determining its spatial distribution by using confocal Raman microscopy. Using this technique we study a tungsten-carbide/carbon (WC/C) surface of a dry-running twin-screw rotor, where worn and untouched locations are compared. Only at worn locations we observe tungsten-oxide Raman modes. Furthermore, several Raman lines are changed significantly in frequency and width, indicating mechanical distortion that occured during the wearing process. Specifically the Raman line at 680 cm−1 is enhanced, which corresponds to an incipient oxidation of the WC stretching mode. Given these findings, our results may be exploited to characterize the degree of wear of coated surfaces and to identify signatures of a tribological layer.