Study of Structure and Tribological Properties in Vacuum of MoS₂-Ti Composite Coatings Deposited by Unbalanced Magnetron Sputtering system

MoS₂-Ti composite coatings are deposited by unbalanced magnetron sputtering system The structure of the coatings has been studied by using SEM , XRD and XRF The tribological behavior of the coatings changed with load , sliding speed and substrate materials 15 studied by using ball-on-disc tester in vacuum simulator The results show that MoS₂-Ti composite coatings are dense and uniform , with the cross-section of which has close columnar structure XRD analysis reveals that the MoS₂ :-Ti composite coatings are strong basal ( 002 ) planes crystal orientation .The Ti content in the coating is 8 wt. % and the atomic ratio of S to Mo is 1 .8 The tribological properties of the coatings are tested in vacuum environment where the pressure is under 5 x 10_-3 Pa and normal temperature .The results show that when test load increases from 5 to ZON , the friction coefficient and wear life of the coatings all decrease When sliding speed increases from 250 to 1 000 r / min , the friction coefficient of the coatings decrease but the wear life of them are almost the same When deposited on different substrate materials , the friction coefficient of the coatings are consistent and the value is as low as 0 .02 .The wear life of the coatings deposited on 9Cr18 ?45 # steel and 4OCr are similar and between 20-25 km The wear mechanism of them appears to be particle wear The wear life of 3OCrMnsi sample 15 only 10.3 km , half of the others .The wear mechanism of it appears to be adhesive wear