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DLC based coatings for tribological applications

 
: Bewilogua, K.; Bialuch, I.; Brand, J.; Keunecke, M.; Ruske, H.; Thomsen, H.; Weber, M.; Wittorf, R.

Ray, N.R. ; Saha Institute of Nuclear Physics -SINP-, Kolkata:
The application of nanocrystalline diamon like carbon materials : IWAncDLC-2006; Nov 28 - Dec 01, 2006
Kolkata, India, 2006
pp.67-75
International Workshop on Application of Nanocrystalline Diamond Like Carbon Materials (IWAncDLC) <2006, Kolkata, India>
English
Conference Paper
Fraunhofer IST ()
diamond-like carbon; DLC; modified DLC; reactive magnetron sputtering; plasma assisted CVD; chemical vapor deposition; friction coefficient; wear; surface energy

Abstract
The present report deals with preparation, properties and typical applications of hydrogenated amorphous carbon (a-C:H) films as well as modified a-C:H films like a-C:H:Me containing metals or a-C:H:X containing other elements. To assess the potential of the different types of modified coatings, we compared them with metal free a-C:H coatings. Metal containing a-C:H:Me coatings were prepared by reactive d.c. magnetron sputter deposition with acetylene as reactive gas and targets from W, WC, Ti, Cr and Nb. The a-C:H:Me films consist of small carbide particles embedded in an amorphous a-C:H matrix. Instead of the mentioned metals, graphite can be used as a target material resulting in metal free a-C:H, also named C-DLC. Today several successful applications of a-C:H and a-C:H:Me coatings for wear and friction reduction are known, e.g. of motor components and forming tools. The necessary adhesion and overload resistance of a-C:H and a-C:H:Me, prepared by reactive DC magnetron sputtering, can be strongly improved applying different interlayer systems. Furthermore, by adding elements like Si, O or F, diamond-like carbon films (a-C:H) can be considerably modified. Such films commonly will be prepares by plasma assisted chemical vapor deposition (PACVD) using suitable precursors containing the elements to be added. For instance silicon containing a-C:H:Si exhibits friction coefficients which are clearly lower than those of pure a-C:H. Highly hydrophobic coatings can be prepared by incorporation of Si and O (a-C:H:Si:O). Such modified films were successful in several applications. However, an optimization of one property mostly leads to a deterioration of other properties. Thus highly hydrophobic films commonly have a low wear resistance. To overcome this relation, multilayer coatings were prepared.

: http://publica.fraunhofer.de/documents/N-51631.html