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Pure MoS2 coating and MoS2-Ti composite coatings with different Ti content (5 15wt.%) have been deposited by HTC 750 unbalanced magnetron sputtering system. The structural and mechanical properties of these coatings as a function of Ti content have been studied. SEM analysis show that the pure MoS2 coating reveals a typical porous and worm-like surface structure, the MoS2 -Ti composite coatings appear densified and compact microstructure and coating porosity decrease with an increase of the Ti content. Nanoindentation test show that the hardness and Young’s modulus of the coatings increase with an increase of the Ti content. Nano-scratch test show that the Ti doped composite coatings improve their adhesion to the substrate apparently. Friction and wear test results show that the pure MoS2 coating appears poor tribological behavior which the friction coefficient is about 0.06 and the endurance life is 5850m. MoS2 -Ti composite coatings not only show low friction coefficient but also low wear rates. The friction coefficient of composite coatings is between 0.02 and 0.04 , and the endurance life of them improve compared to the pure MoS2 coating. PACS: 81.05.-t; 68.55.-a; 68.35.Np; 62.20.Qp.

The effect of Ti content on the structural and mechanical properties of MoS2 Ti composite coatings deposited by unbalanced magnetron sputtering system