Berlin 2005 – scientific programme

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M: Metallphysik

M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)

M 32.16: Poster

Monday, March 7, 2005, 14:30–16:30, Poster TU B

Dry sliding of copper tested by microtribometers in air and in vacuum — •Y. Liu, M. Gubisch, M. Himmerlich, S. Krischok, M. Scherge, and J.A. Schaefer — Institut für Physik und ZMN, TU Ilmenau, 98684 Ilmenau

At low speed and low load, mild wear was found in sliding tests of copper and its alloys. The mild wear is usually related to the formation of oxide films and influenced by the hardness of the substrates. If the oxide film remains after slider passes, and the substrate is hard enough to support the oxide film, the sliding occurs between the oxides, and thus a low wear and low coefficient of friction are expected. We examined this scenario by dry sliding tests of pure copper using microtribometers in air and in vacuum. The oxide films in the wear tracks were studied with scanning electron microscopy and photoelectron emission microscopy combined with locally resolved photoelectron spectroscopy. The deformation band underneath the wear tracks was revealed by conventional metallographic method and was observed by orientation imaging microscopy. The effect of the surface finishing and the atmospheric pressure on the coefficient of friction was examined, and discussed with reference to the formation of oxide films and the development of deformation band.