Ti/MoS 2 /Si/MoS 2 multilayer coating was fabricated by a pulse laser deposition method from a titanium, molybdenum disulphide, and silicon targets, and the coating was deposited in layers on aluminium-silicon substrates, at room temperature. The structural analysis and surface morphology of multilayer Ti/MoS 2 /Si/MoS 2 coating were analysed using X-ray diffraction, Raman spectroscopy, and scanning electron microscopy integrated with energy dispersive X-ray spectroscopy. Nanomechanical tests were performed on Ti/MoS 2 /Si/MoS 2 coating at small loads of 2000 to 6000 μN to study the effect of load on hardness and Young's modulus. Nanoscratch and nanowear tests were conducted on Ti/MoS 2 /Si/MoS 2 coating at a low load of 1000 to 5000 μN and 100 to 500 μN, respectively, to study deformation and failure behaviours of coating/substrate system and also their nanotribological properties.The results show that hardness and Young's modulus of Ti/MoS 2 /Si/MoS 2 coating decrease with increase in load. A low friction coefficient of 0.09 to 0.16 was observed, which proves that the Ti/MoS 2 /Si/MoS 2 coating possesses selflubricating property. The wear rate of Ti/MoS 2 /Si/MoS 2 coating increases 3.3 × 10 −10 to 7.8 × 10 −10 mm 3 /Nm with increase in load. Ti/MoS 2 /Si/MoS 2 multilayer coating shows a smooth wear track with no cracks and debris on the surface, which attributed plastic flow of softer coating material around the wear track.

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Ti/MoS2 coating was deposited by pulse laser deposition technology on Al-Si substrate. The microstructure, elemental analysis, nanotribological behavior of coating was investigated. The coating was composed of Ti, Mo, S, and O with typical diffraction peak around 2θ range from 30 deg to 70 deg. Nanoscratch with ramp loading was performed at low loads. The scratch test with ramp normal loading was analyzed for failure of coating in three ranges, viz., range A, range B, and range C. Scratch test result shows that the peeling of coating occurred at the normal load of 1327.75 μN and the lateral load of 75.96 μN. Nanowear with 2, 4, 6, 8, 10 number of cycles was performed at low load 100 μN. Nanowear results shows that wear rate decreases with increase in wear cycles, which attributed the self-lubricating property of Ti/MoS2 coating. Also, Ti/MoS2 coating display smooth wear path with no debris and cracks, which attributed plastic flow of coating around impression. Thus, mode of wear mechanism is mainly ductile and abrasive.

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