Tribological properties of Ti/Pb-MoS 2 -Graphene composite films under high environment temperature

For purpose of enhancing the tribological properties of molybdenum disulfide (MoS 2 ) films, Ti/Pb doping and graphene dripping have been synchronously introduced to restrain the oxidation and wear under the environment temperature of 25, 100, 200, 300 and 400 °C. The MoS 2 , Ti-MoS 2 , Pb-MoS 2 and Ti/Pb-MoS 2 films have been prepared on the GCr15 steel substance by magnetron sputtering; and then graphene has been doped on the surface of the MoS 2 -based films to investigate the synergistic effects of graphene and MoS 2 -based films on the tribological performances tested by the UMT multifunctional friction and wear tester. Experimental results show the friction coefficient and wear rate of the MoS 2 -based films increase with the rising of the environment temperature. Wear mechanisms of tested under various temperatures are the co-action of oxidation wear and abrasive wear. Comparing the MoS 2 -graphene composite film, the Ti, Pb or Ti/Pb doped MoS 2 -graphene composite films tested under the environment temperature of below 400 ℃ show a low friction coefficient (less than 0.1) and a low wear rate, which is owing to the redox reaction of graphene and metal (Ti and Pb).