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KR: Fachgruppe Kristallographie

KR 5: Poster - Crystallography

KR 5.3: Poster

Mittwoch, 13. März 2013, 15:00–17:30, Poster B2

Structure, mechanical, and tribological properties of C:Ni nanocomposite films grown by IBAD — •S. Gemming^1,2, M. Krause^1,3, T. Kunze^1,3, A. Mücklich¹, M. Fritzsche¹, R. Wenisch¹, M. Posselt¹, A. Schneider¹, and G. Abrasonis¹ — ¹HZ Dresden-Rossendorf, D-01314 Dresden — ²TU Chemnitz, D-09107 Chemnitz — ³TU Dresden, D-01062 Dresden

The mechanical and tribological properties of nanostructured carbon:nickel films on silicon substrates are investigated by a multi-scale experimental and theoretical approach. The C:Ni nanostructures comprising either tilted columns or three-dimensionally self-organized nanopatterns are grown by ion-beam assisted deposition (IBAD). Complex layer architectures were obtained by sequential deposition by rotating the substrate in relation to the assisting ion beam after each deposition step. Atomic composition of the films was determined by ion beam analysis. The phase structure of carbon was analyzed by Raman spectroscopy, that of nickel by X-ray diffraction. The microstructure of the films was determined by high resolution transmission electron microscopy. The films show good adhesion as probed by scratch tests. The film hardness is about 20 GPa, and the elastic modulus 200 GPa. Friction coefficients on the order of 0.1 are found for oscillating wear conditions under ambient conditions. Atomistic computer simulations assist the experimental findings for dry and liquid contacts. The simulation shows a complex behaviour for the carbon-carbon interaction, e.g. resulting in the formation of a tribo-layer. Support by the ECEMP excellence cluster is acknowledged.