Abstract
Advanced solid lubricants coatings for vacuum applications have been the subject of considerable development for many years, thanks to the use of the new coating techniques, such as physical and/or chemical vapor deposition processes. The present paper discusses and compares the friction behavior of two kinds of thin film solid lubricants (MoS 2 and hydrogenated Diamond-Like Carbon - DLC ) in ambient air and in vacuum down to 10 −7 Pa. We show how friction is dependent on the environment, and the analogy of the results for the two kinds of coating. The potentiality of DLC coatings used as solid lubricant for space applications is thus highlighted, in comparison with the more extensively used MoS 2 lubricant.
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