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Microstructure, mechanical properties and friction behavior of magnetron-sputtered V-C coatings

Stoyanov, Pantcho; Schneider, Johannes; Rinke, Monika; Ulrich, Sven; Nold, Eberhard; Dienwiebel, Martin; Stüber, Michael

Abstract:
This study describes reciprocating sliding friction experiments of three types of magnetron-sputtered vanadium carbide/amorphous carbon nanocomposite coatings, VC1 − x/a-C, against alumina counterparts under unlubricated conditions. It links micro- to macroscale tribology in order to provide a better understanding of the sliding mechanisms of these nanocomposite coatings with varying constitution and microstructure (i.e. by varying the C/V concentration ratio between 1.2 and 2.9). Correspondingly, the volume fraction of the amorphous carbon phase (a-C) increases with increasing the carbon content as shown by electron microprobe studies, X-ray diffraction and Raman spectroscopy; simultaneously, the volume fraction of nanocrystalline vanadium carbide (VC1 − x) decreases, and the crystallite size and crystallinity of the thin films decrease with increasing carbon content. These constitution and microstructure changes have an impact both on the mechanical and the tribological properties of the coatings. Mechanical properties characterization shows that the indentation hardness (H) and the reduced modulus (Er) of the coatings decrease wi ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1016/j.surfcoat.2017.04.050
ISSN: 0257-8972, 1879-3347
KITopen ID: 1000069561
HGF-Programm 43.22.01; LK 01
Erschienen in Surface and coatings technology
Band 321
Seiten 366-377
Schlagworte Vanadium carbide, Carbon-based composites, Non-reactive d.c. magnetron sputtering, Microtribology, Third bodies, Velocity accommodation modes
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