Anti-wear (AW) and extreme-pressure (EP) behavior of jojoba oil dispersed with green additive CaCO3 nanoparticles

Abstract

Lubricating approaches involving nanoparticles have a significant role in reducing friction and wear. Reducing friction is crucial for preserving energy, minimizing emissions, and protecting the environment. The present experimental study investigates green nano-lubricants prepared by dispersing various concentrations of CaCO3 nanoparticles in jojoba oil. The aim of the study is to assess the usability of a bio-sourced alternative nanolubricant to depleting conventional lubricants. The role of nanoparticle concentration and thermo-physical properties in improving the lubrication properties of jojoba oil was thoroughly investigated in the present study. The anti-wear and extreme-pressure behavior of jojoba oil dispersed with CaCO3 nanoparticles were evaluated as per the ASTM D4172 and ASTM D2783 test standards. The coefficient of friction, wear scar diameter, last non-seizure load, initial seizure load, weld point load, and load wear index of each sample were assessed. Compared with pure jojoba oil, the addition of CaCO3 nanoparticles in jojoba oil revealed remarkable anti-wear and extreme-pressure properties with significant improvements in the last non-seizure load, initial seizure load, weld point load, and load wear index, the average friction coefficient and the average wear scar diameter of the steel balls decreased by as much as 34.1% and 40.2%, respectively.