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NANOCOAT Résumé de rapport

Project ID: G5RD-CT-2002-00705
Financé au titre de: FP5-GROWTH
Pays: Germany

Coating technology for production of wear resistant Carbon/Carbon multilayer system

A PVD coating technology was developed that allows the deposition of nanostructured carbon coatings for demanding tribological applications. The coating can be deposited by vacuum-arc discharge from graphite sources in dedicated PVD coating machines. There was developed a pulsed arc technique allowing for high-rate deposition of good-quality C/C-ML films in the thickness range 100 nm - 10 µm. The films can be deposited on complex three-dimensional metal substrates as steel components and tools. The periodicity is obtained by periodical change of deposition parameters influencing the energy of depositing carbon species.

The developed Carbon/Carbon multilayer (C/C-ML) is a coating for protecting metallic surfaces from wear and to reduce the friction force under tribological loading. It is a nanostructured amorphous coating consisting of 100% carbon. The layered nanostructure is obtained by periodic variation of chemical bonding state (sp-hybridization) between carbon atoms.

The film is composed of nanometre-layers with dominating sp3-content (diamond bonding) and dominating sp2-content (graphite bonding). Irrespective of partial graphite bonding the overall coating hardness is high (>40 GPa) resulting in extraordinary good wear resistance. The nanostructured C/C-ML is predestined for tribological application under demanding mechanical loading conditions. The films have high potential for low-wear and low-friction application e.g. on components in automotive industry. The special benefit of the coatings is the extremely low friction and wear under dry and mixed lubrication conditions.

Informations connexes


Volker WEIHNACHT, (Group leader)
Tél.: +49-351-2583247
Fax: +49-351-2583300