Tribological behavior of sputter-deposited MoSX/Ni coatings

AbstractSputtered MoS۲ coatings have been mostly used as a solid lubricant. In this investigation, MoSx/Ni composite coatings with Ni contents varying from ۰ to ۲۲ % were deposited onto steel substrate using a DC magnetron sputter process. The MoS۲/Ni ratio in the coatings was controlled by sputtering the composite targets. The composition, microstructure, and mechanical properties of the coatings were explored using an energy dispersive analysis of X-ray (EDX), Xray diffraction (XRD), nano indentation, and scratch techniques. The tribological behavior of the coatings was investigated using the pin-on-disc test at room temperature. The nickel doping in MoS۲–Nix% coatings improves their mechanical properties, cohesive strength and tribological properties. The films exhibited a steady state friction coefficient from ۰.۱۳ to ۰.۱۹ and the main wear mechanisms of the MoSx/Ni coating in air were abrasive, adhesive, and oxidation wear.Keywords: MoSX/Ni coating; Tribological properties; PVD ; Low friction; Solid lubricant; Low friction; Solid lubricant