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2008
Conference Paper
Titel
Die Rolle der Phasenumwandlung beim Verschleiß von DLC Schichten
Abstract
The low coefficient of friction and the high wear resistance of DLC coatings is usually attributed to a transfer film on the counter part and a phase transformation within the coating. In ball indentation, sliding and rolling contact experiments the formation of the transfer film, the phase transition and the wear and friction behaviour of a-C:H coatings was examined. The wear increased linear with the time and the initial roughness. The forming of the transfer film seems to be linear as well and is accompanied by a reduction of the sp3 content of the coating within the contact zone. Molecular dynamic simulation show, that the increase in sp2 portion in not due to a grafitisation of the a-C:H, but due to the forming of more amorphous sp2 bondings, which leads to a reduction of interatomic contacts to the counterpart.
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