Tribological Characteries of MoS2 and DLC film in Sliding Contacts under Different Lubrication Conditions

The objective of this study is to investigate the effect of solid and liquid lubrication on friction and wear performance of selected solid lubricating coatings, comparative experiments have been carried out on magnetron sputtered MoS2 coatings and chemical vapor deposited hydrogenated diamond-like carbon (DLC) films against Si3N4 ball using a ball-on-disk tribo-tester under the conditions of room temperature and different lubrication condition. The friction coefficient (COF) of solid films also was analyzed. It was shown that the friction be greatly reduced when the MoS2 and DLC solid film lubricated with oil and grease simultaneously compared to lubricated singly at the start-up or under boundary lubrication conditions.