Abstract
Abstract Effect of grease constituents such as base oil, thickener, and their interaction on the lubricating film thickness at various speeds has been studied. The rheological properties of greases and impact of thickener, various oil soluble polymers and their molecular weight on these properties are examined. Greases when used in high temperature and high pressure applications result in high friction and wear, how to improve their anti-wear and extreme pressure properties has been investigated. The effect of various additives such as Benzoic acid, polytetrafluroethylene (PTFE), nano titanium dioxide, cerium oxide (CeO2), sulphurized isobutene, carbon nanotubes, graphene nanosheets, on the tribological properties of various greases is studied. This review article aims to present an overview of the role of base oil, thickener, viscosity modifiers, and various additives in grease lubrication and in enhancement of tribological properties of various greases.
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