Investigation of tribological performances of EP oil additive with gelatin and PVA coated nanoparticles

Abstract

In this study, the effect of the lubricant prepared by adding EP and silver nanoparticles (AgNP) coated with different ligands to the ethylene glycol (EG) liquid on the tribological performance of the bearing material made of CuSn10Zn tin bronze was investigated. For the tribological analysis of EP additive, the optimum EP ratio was determined by carrying out wear tests in dry medium, pure EG and lubricant media prepared by adding volume of 5%, 10%, 15% EP to EG liquid. Optimum AgNP concentration and ligand material were determined by using volume of 2%, 5% and 8% AgNP coated with different ligands together with the determined optimum EP. In both stages, where optimum EP and AgNP concentrations were determined, the experiments were carried out with a reciprocating tribometer (ball on plate) with a load of 20 N and a speed of 40 rpm. Experiment results were analyzed by comparing friction coefficient, wear volume values with SEM and 3D topography images. According to the analysis results, it was determined that the friction coefficient and wear volume values obtained in EG + 5% EP environment were lower than 10% and 15% concentrations. According to the results obtained from the interaction of EG + 5% EP with AgNP, the optimum AgNP concentration was determined as 2%, and the optimum ligand material was determined as gelatin (Gel). In EG + 5% EP + 2% AgNP_Gel conditions, the friction coefficient was reduced by 18.70% and the volume loss by 16.94% compared to EG.