Experimental investigation on Tribological and thermos physical Properties of coconut shell carbon Nanoparticle sae20w40 nanolubricant

Abstract

Primary energy losses in any mechanical systems involving relative newlinemovements are due to friction. It is suppressed with the use of lubricating oils, newlinebut certainly not enough for effectively reducing the friction in the system. newlineTherefore, it is necessary to increase the tribological characteristics of the newlinelubricating oil. To enhance the tribological characteristics, it is necessary for the newlineadditives added to the lube oil have the antioxidant property. Considering this in newlinemind, in the present research work, low cost and environmentally friendly Green newlineAntioxidant (GAO) grafted coconut shell carbon nanoparticles were prepared newline(high-energy ball milling) and the structural and thermal properties were newlinecompletely analyzed using FE-SEM with EDAX, XRD, ATR-FTIR, DLS, BET newlineand TG-DTA images. Based on the study, the milled GAO grafted coconut shell newlinecarbon nanoparticles (27 hours) were found to have larger surface area, nonpolar newlinefunctional group, better crystalline nature and longer thermal stability as newlinecompared to un-milled and milled coconut shell carbon nanoparticles (20 hours). newlineA new nanolubricant: mixture of SAE 20W40 and milled coconut shell carbon newlinenanoparticles was prepared by two step method and its tribological, thermophysical newlineand stability characteristics were investigated. Six concentrations newline(0.05, 0.1, 0.2, 0.3, 0.4 and 0.5 wt.%) of coconut shell carbon nanoparticles were newlinedispersed in the base lubricant for studying the tribological properties, out of newlinewhich 0.05, 0.3 and 0.5 wt.% nanolubricant showed excellent wear reduction of newline108.26%, 131.83% and 125.10% compared to conventional lubricating oil. Also, newlinethe coefficient of friction of 0.05, 0.2 and 0.4 wt% nanolubricant greatly reduced newlineat 257.14%, 338.09% and 242.85% respectively. Therefore, the excellent wear newlinereduction nanolubricant concentrations, 0.05, 0.3 and 0.5 wt.% were selected for newlinefurther investigation of its thermo-physical properties. Except thermal newlineconductivity, all thermo-physical properties got improved with the increase in newlinethe concentration of the nanoparticles newline