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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REFERENCES
Ermakov, S.F., Tribologiya zhidkokristallicheskikh nanomaterialov i sistem: monografiya (Tribology of Liquid Crystalline Nanomaterials and Systems: Monograph), Minsk: Belarusskaya Navuka, 2012.
Mori, S. and Iwata, H., Relationship between tribological performance of liquid crystals and their molecular structure, Tribol. Int., 1996, vol. 29, pp. 35–39.
Nevskaya, G.E., Tomilin, M.G., and Chigrinov, V.G., Liquid crystals and their practical use, Zhidk. Krist. Ikh Prakt. Ispol’z., 2009, no. 1 (27), pp. 5–23.
Akhmatov, A.S., Molekulyarnaya fizika granichnogo treniya: monografiya (Molecular Physics of Interface Friction: Monograph), Moscow: Fizmatgiz, 1963.
Fuks, G.I., Adsorption and lubricity of oils, Trenie Iznos, 1983, vol. 4, no. 3, pp. 398–414.
Kupchinov, B.I., et al., Effect of liquid crystals on friction of solids, Trenie Iznos, 1987, vol. 8, no. 4, pp. 614–619.
Voronin, S.V., Development of tribophysical foundations of lubricity of liquid-crystal additives to base oils, East.-Eur. J. Enterprise Technol., 2015, vol. 3, no. 7, pp. 53–57.
Tishchenko, V.G. and Cherkashina, R.M., Molecular structure and mesomorphism of steroid derivatives, in Kholestericheskie zhidkie kristally (Cholesteric Liquid Crystals), Novosibirsk: Inst. Teor. Prikl. Mekh., 1976, pp. 26–34.
Vinarskii, M.S. and Lur’e, M.V., Planirovanie eksperimenta v tekhnologicheskikh issledovaniyakh (Experiment Planning in Technological Studies), Kiev: Tekhnika, 1975.
Voronin, S.V., Suranov, A.V., and Suranov, A.A., The effect of carbon nanoadditives on the tribological properties of industrial oils, J. Frict. Wear, 2017, vol. 38, no. 5, pp. 359–363.
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Translated by K. Lazarev
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Voronin, S.V., Stefanov, V.A., Onopreichuk, D.V. et al. Effect of Concentration and Type of Liquid Crystal Additive on Tribological Characteristics of Industrial Oils. J. Frict. Wear 41, 365–369 (2020). https://doi.org/10.3103/S1068366620040133
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DOI: https://doi.org/10.3103/S1068366620040133