Investigation on Tribological Performance of Nano Zno and Mixed Oxide of Cu – Zn as Additives in Engine Oil. 2020-01-1095
Lubrication plays an essential role in wear reduction of various mechanisms, eliminating surface to surface contact of components. In the automotive field the lubricants, in the form of oils or greases, are presented in motors, gearboxes, distributors, differentials, pumps, bearings etc. The quality and the condition of lubricants influence the performance through the properties as high pressure resistance, viscosity and viscosity index, anti-wear and anti-corrosion resistance etc. The Proper lubrication augments the efficiency and the reliability of engines and protects against corrosion and wear. In an internal combustion engine, almost 33% of the energy produced by the fuel during combustion was wasted due to very high friction between the moving parts in the engine because the engine oil could not play a effective role during in different operating condition. Nanoparticles used as additives in the engine oil can exhibit good friction reduction and anti-wear behavior. The present study aims to enhance the tribological performance of engine oil SAE(20W-40) by employing nano zinc oxide and mixed oxides of copper and zinc as additives. The zinc oxide and oxides of copper and zinc were prepared using chemical method and characterized using XRD and SEM analysis. The tribological behavior was studied using Four ball tribotester by dispersing varying concentration of zinc oxide and mixed oxides of copper and zinc (0.01wt% - 0.05wt%) separately in the engine oil using surface modifiers. The experimental results revealed that the nano zinc oxide based suspensions showed nearly 19% reduction in the Coefficient of friction values while the Wear scar area and Wear surface diameter showed 64% and 50% reduction respectively in comparisons to the mixed oxides of copper and zinc.