MoS2-based Ti composite coatings were deposited on the AISI 4118 alloy and gears using an RF magnetron sputtering (RFMS) system. While MoS2 coating had been coated on the silicon substrate. The coatings structures were compared to each other to find the effect of Ti. The composite coatings have been performed by a ball-on-disk tribometer to investigate tribological behavior at various conditions. The structure of the coatings has been extensively studied by a variety of techniques, including X-ray diffraction (XRD) and scanning electron microscopy (SEM), etc, respectively. The composite coatings were also applied the gears of a reduction gearbox. The efficiencies of uncoated and coated gear with MoS2 based Ti coatings were measured and compared at various input rotating speed under absorption oil film condition. It was found that the efficiency of gear had significantly improved after MoS2-based Ti composite coatings deposition.

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