Improving the tribological properties of mineral oils is necessary for energy conservation and enhancing machine efficiency. The antifriction and antiwear properties of 10W40 oil were significantly improved by the addition of small amounts of oxidized graphite flakes. According to the X-ray photoelectron spectroscopy (XPS), this improvement was related to the oxidation of ultrasonicated graphite flakes in an ambient atmosphere accompanied by the adsorption of oxygenated compounds. The oxidation induces the defects which modify the chemical structure in an sp 2 graphite lattice. The dispersion stability of graphite flakes increased in 10W40 oil due to their structural defects and adsorbed oxygen functional groups. This was found to be the main reason behind the improvement of the lubricating properties of graphite flake additives. The formation of transfer films of the graphite structure on the sliding interfaces was shown by the micro-Raman spectroscopy, which explained the improvement of the antifriction and antiwear properties of the mixture by the mechanical reasons.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Myshkin, N.K. and Goryacheva, I.G., Tribology: trends in the half-century development, J. Frict. Wear, 2016, vol. 37, no. 6, pp. 513–516.
Grigoriev, A.Ya., Kovaleva, I.N., and Myshkin, N.K., Friction of brush-like self-assembled monomolecular coatings, J. Frict. Wear, 2008, vol. 29, no. 6, pp. 434–440.
Krasnov, A.P., Naumkin, A.V., Yudin, A.S., Solov’eva, V.A., Afonicheva, O.V., Buyaev, D.I., Tikhonov, N.N., Nature of initial acts of friction of ultrahigh molecular weight polyethylene with steel surface, J. Frict. Wear, 2013, vol. 34, no. 2, pp. 120–128.
Mungse, H.P., Kumar, N., and Khatri, O.P., Synthesis, dispersion and lubrication potential of basal plane functionalized alkylated graphene nanosheets, RSC Adv., 2015, vol. 5, pp. 25565–25571.
Bhavana, G., Panda, K., Kumar, N., Melvin, A.A., Dash, S., and Tyagi, A.K., Chemically grafted graphite nanosheets dispersed in poly(ethylene-glycol) by γ-radiolysis for enhanced lubrication, RSC Adv., 2015, vol. 5, pp. 53766–53775.
Ferrari, A.C. and Robertson, J., Interpretation of Raman spectra of disordered and amorphous carbon, Phys. Rev. B, 2000, vol. 61, pp. 14095–14107.
Dongxing, Y., Aruna, V., Gulay, B., Sungjin, P., Meryl, S., Piner, R.D., Stankovich, S., Jung, I., Field, D.A., Jr., Ventrice, C.A., and Ruoff, R.S., Chemical analysis of graphene oxide films after heat and chemical treatments by X-ray photoelectron and micro-Raman spectroscopy, Carbon, 2009, vol. 47, no. 1, pp. 145–152.
Gorbunov, D.A., Adhesion interaction on the contact at graphite friction, Cand. Sci. (Phys.-Math.) Dissertation, Moscow: State Inst. Graphite-Based Constr. Mater., 1981.
Lin, J., Wang, L., and Chen, G., Modification of graphene platelets and their tribological properties as a lubricant additive, Tribol. Lett., 2011, vol. 41, no. 1, pp. 209–215.
Bhavana, G., Kumar, N., Kozakov, A.T., Kolesnikov, V.I., Sidashov, A.V., and Dash, S., Lubrication properties of chemically aged reduced graphene-oxide additives, Surf. Interfaces, 2017, vol. 7, pp. 6–13.
Original Russian Text © N. Kumar, A.T. Kozakov, V.I. Kolesnikov, A.V. Sidashov, 2017, published in Trenie i Iznos, 2017, Vol. 38, No. 5, pp. 411–417.
About this article
Cite this article
Kumar, N., Kozakov, A.T., Kolesnikov, V.I. et al. Improving the lubricating properties of 10W40 oil using oxidized graphite additives. J. Frict. Wear 38, 349–354 (2017). https://doi.org/10.3103/S1068366617050051
- oxidized graphite
- tribological properties
- antifriction properties
- mineral oils
- transfer films
- micro-Raman spectroscopy
- X-ray photoelectron spectroscopy