Abstract
Effect of MoS x content has been studied in TiN–MoS x composite coating deposited by closed-field unbalanced magnetron sputtering (CFUBMS) using separate MoS 2 and Ti target in N 2 gas environment. Pulsed dc power was applied for both the targets as well as for substrate biasing. Crystallographic orientation and structure of the coating was analysed by grazing incidence X-ray diffraction (GIXRD) technique. The surface morphology and coating fractograph were studied with field emission scanning electron microscopy (FESEM) whereas the composition of the coating was determined by energy dispersive spectroscopy (EDS) by X-ray. Scratch adhesion test, Vickers microhardness test and pin-on-disc test with cemented carbide (WC–6%Co) ball were carried out to investigate mechanical and tribological properties of the coating. Increase in MoS x content (from 6.22 wt.% to 30.43 wt.%) was found to be associated with decrease in grain size (from 63 nm to 24 nm). Maximum hardness of 32 GPa was obtained for TiN– MoS x composite coating. Film substrate adhesion was also observed to depend on MoS x content of the composite coating. Significant improvement in tribological properties was observed. With optimal MoS x content, it was possible to achieve low friction ( µ = 0.02–0.04) and wear resistant (wear coefficient = 5.5 × 10 − 16 m 3/Nm) composite solid lubricant coating.
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