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The present research deals with study of pongamia oil methyl ester as a lubricant by blending with anti-wear additive ZDDP. The experimental work carried in this work aims to investigates the friction and wear characteristics by blending zinc diakyldithio phosphates (ZDDP) with pongamia oil methyl ester as lubricant under various loading conditions and temperatures. The coefficient of friction and wear scar depth were determined using pongamia biodiesel blended with 0.3%, 0.6% and 1 % ZDDP by concentration through high frequency reciprocating wear testing machine for 2 h duration. The reciprocating wear tests were performed on an engine liner-piston ring contact under the loads of 40 N, 60 N and 80 N for 2 h duration at temperatures of 100°C, 125°C 150° C with 10 Hz oscillation frequency. The addition of ZDDP with pongamia biodiesel showed marginal reduction in friction coefficient and wear scar depth under all loads and temperatures.

The present work compares the tribological properties of ZnO (Zinc Oxide) nanoparticle based lubricant with ZDDP (zinc dialkyl dithiophosphate) based lubricant. The nanolubricant was prepared by mixing the nanoparticles in base oil followed by ultrasonification and ZDDP based lubricant was prepared by mixing ZDDP and stirring with base oil. Base oil used was mineral base oil. Both the lubricants were tested at three different temperatures, loads and roughness values. The test was carried out on AISI 52100 steel samples prepared by wire cutting and were grinded to three different levels of surface roughness. Friction and wear tests were performed using a reciprocating sliding tribo-tester at three different loads and temperatures. Taguchi orthogonal array was used to reduce the number of experiments. SEM, EDS and AFM analysis were carried out to study the surface wear phenomenon.