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Perfluoropolyether (PFPE) oil possessing higher oxidation stability than hydrocarbon lubricant is combined with Ti:WS 2  film to construct a solid–liquid composite lubricating system. The results indicate that atomic oxygen (AO) irradiation generates some important effects for the Ti:WS 2 /PFPE composite lubricating system. With an increase of irradiation dose, the molecular structure of PFPE oil experiences carbon chain breakage and appears to be an obvious molecule for cross-linking and polymerization. Meanwhile, Ti:WS 2  film also is oxidized to a different extent to form WO 3 . The changes in the solid–liquid system resulted in greatly different tribological properties of the Ti:WS 2 /PFPE system. The friction coefficient of the system significantly increases with low-dose irradiation, while inversely, the value sharply decreases with high-dose AO, which is related to the presence of WO 3  and formation of a transfer film. Finally, the failure mechanism of Ti:WS 2 /PFPE system under AO irradiation has been revealed.

Effect of Irradiation Dose on the Structure and Tribological Performance of Ti:WS 2 /PFPE Composite Lubricating System in Atomic Oxygen Environment