Improving the characteristics of engine oil using nanofluid as coolant in combat vehicles

Nanoparticles can be used as an additive in the engine oil to improve its lubrication properties to reduce wear and friction of the engine. In this research MoS2 nanoparticles are added to engine oil 20 W40 and Tribological properties are investigated. Samples were prepared of varying percentage of MoS2 nanoparticles in engine oil (0.2, 0.1, 0.5 and 0.025 wt%). The wear and friction tests were carried on four balls Testing Machine and the tests were performed with varying load, speed and varying concentration of nanoparticles in engine oil. The obtained results show that MoS2 nanoparticles added in engine oil exhibits good friction reduction and anti-wear properties and also decreased the coefficient of friction by 15.3% at 0.025 wt% concentration respectively, as compared with standard engine oil without MoS2 nanoparticles. This tribological behavior is closely related to the deposition of nanoparticles on the rubbing surfaces. In addition, the topography of worn surfaces was analyzed by using Scanning Electron Microscopy (SEM). Finally we check the characteristics of nanofluid with nanoparticle as additive and without additives.