Deposition and tribological behaviour of sputtered carbon hard coatings

The exceptional tribological properties of low deposition temperature sputt ered carbon coatings (Graphit-iC coatings) have been recently reported. Thi s paper describes the latest development of these coatings and particularly how, by an optimisation of the deposition parameters, it has been possible to obtain relative soft to very hard coatings with extremely low specific wear rates. The coatings have been deposited in a closed field unbalanced m agnetron sputter ion plating (CFUBMSIP) installation. By applying the appro priate conditions of deposition, carbon coatings with hardness from 1500 to 4000 HV can be routinely deposited. Preliminary analytical results are pre sented in order to characterise such hard coatings: high-resolution transmi ssion electron microscopy, scanning electron microscopy and X-ray diffracti on analysis are some of the different techniques used for this work. Finall y, a number of the applications are reported with tribological test results . (C) 2000 Elsevier Science S.A. All rights reserved.