Abstract
This paper considers the mechanism of formation and structure of boundary lubricating films on the metal surface in the presence of different types of additives, namely fatty acids and cholesteric-type mesogens, whose molecules have a phenanthrene skeleton. The results of laboratory studies of the tribological properties of industrial oil I-30A supplemented with the indicated types of additives in various concentrations are presented. The studies were carried out on a four-ball friction machine according to the standard method, and the main indicators of the lubricating ability of oil samples with additives, such as the diameter of the wear spot, critical load, scoring index, and welding load, were determined. According to the obtained results, it was found that the greatest positive effect on the lubricating ability of industrial oils is exerted by a liquid crystal additive, when compared to fatty acid, and the maximum anti-wear effect is observed at concentrations lying within the studied range. These data indicate the presence of a region of rational concentration of the liquid crystal additive in industrial oil.
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