The effect of the nanodisperse phase of magnetic oils on their lubricating properties
A.N. Bolotov, O.O. Novikova
Tver State Technical University
DOI: 10.26456/pcascnn/2022.14.545
Original article
Abstract: The work is devoted to the study of processes occurring in the boundary lubricant layer, in which nanodisperse magnetic particles play a decisive or significant role. The friction between metal surfaces with lubricated oils of different concentrations of the magnetic nanodisperse phase was studied. The dispersion medium of magnetic oils consisted of liquids with various physico-chemical properties: dioctylsebacinate, triethanolamine, polyethylsiloxane. It has been shown that the wear intensity of surfaces with a hardness higher than that of nanoparticles monotonically increases with increasing the particle concentration, and wear is abrasive in nature. The wear rate of softer materials passes through a minimum at a particle concentration of about 2 vol.%. Magnetic separation of large agglomerates in oil allows for some time to reduce the abrasive wear until they are formed again under friction conditions. It was not possible to identify the regularities of the influence of nanodispersed particles on the friction force, it is probably insignificant. Several examples of the indirect effect of nanodispersed particles on the boundary friction are considered. In all the examples, the determining role plays huge area of the active surface of particles per unit volume of oil. For example, under conditions of friction, atomic hydrogen can be actively formed during the chemical interaction of fatty acids with the surface. Atomic hydrogen accumulates in the subsurface pores and is crystallized there. The increased pressure in the pores created by hydrogen molecules leads to an increase in wear by the peeling mechanism. The established regularities of the influence of nanodispersed particles on the rate of formation of the boundary lubricant layer and the corrosion wear of surfaces caused by surface-
active additives in magnetic oil are of scientific interest.
Keywords: nanodisperse particles, magnetic oil, grease, friction, wear
- Alexander N. Bolotov – Dr. Sc., Professor, Head of the Applied Physics Department, Tver State Technical University
- Olga O. Novikova – Ph. D., Docent, Docent of the Applied Physics Department, Tver State Technical University
Reference:
Bolotov, A.N. The effect of the nanodisperse phase of magnetic oils on their lubricating properties / A.N. Bolotov, O.O. Novikova // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2022. — I. 14. — P. 545-560. DOI: 10.26456/pcascnn/2022.14.545. (In Russian).
Full article (in Russian): download PDF file
References:
1. Kole M., Khandekar S. Engineering applications of ferrofluids: A review, Journal of Magnetism and Magnetic Materials, 2021, vol. 537, art. no. 168222, 12 p. DOI: 10.1016/j.jmmm.2021.168222.
2. Uhlmann E., Spur G., Bayat N., Patzwald R. Application of magnetic fluids in tribotechnical systems, Journal of Magnetism and Magnetic Materials, 2002, vol. 252, pp. 336-340. DOI: 10.1016/S0304-8853(02)00724-2.
3. Li-jun W., Chu-wen G., Ryuichiro Y., Yue W. Tribological properties of Mn-Zn-Fe magnetic fluids under magnetic field, Tribology International, 2009, vol. 42, issue 6, pp. 792-797. DOI:10.1016/j.triboint.2008.10.009.
4. Bolotov A.N., Novikova O.O., Novikov V.V. Magnitnye siloksanovye nanozhidkosti adaptirovannye dlya uslovij granichnogo treniya [Silicone magnetic nanofluids adapted for the conditions of boundary friction], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2020, issue 12, pp. 546-556. DOI: 10.26456/pcascnn/2020.12.546. (In Russian).
5. Bolotov A.N., Novikova O.O. Smazochnye svojstva magnitnyh nanozhidkostej na osnove efirov karbonovyh kislot [Lubrication properties of magnetic nanoliquids based on carboxylic acids], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2019, issue 11, pp. 555-563. DOI: 10.26456/pcascnn/2019.11.555. (In Russian).
6. Kashcheev V.N. Abrazivnoe razrushenie tverdyh tel [Abrasive destruction of solids], Moscow, Nauka Publ., 1970, 247 p. (In Russian).
7. Sheinman E.L. Abrazivnyj iznos. Obzor amerikanskoj pechati [Abrasive wear. Review of the American press], Journal of Friction and Wear, 2005, vol. 26, issue 1, pp. 100-111. (In Russian).
8. Medvedeva V.V., Skotnikova M.A., Breki A.D., Krylov N.A., Fadin Yu.A., Gvozdev A.E. Ocenka vliyaniya razmera chastic i koncentracii poroshkov gornyh porod na protivoiznosnye svojstva zhidkih smazochnyh kompozicij [Evaluation of the influence of particle size and concentration of powders of rocks on the antiwear properties of liquid lubricant compositions], Izvestiya TulGU, Tekhnicheskie nauki, 2015, issue 11, part 1, pp. 57-65. (In Russian).
9. Fuks I.G. Dobavki k plastichnym smazkam [Grease additives], Moscow, Khimiya Publ., 1982, 248 p. (In Russian).
10. Joly-Pottuz L., Vacher B., Ohmae N., Martin J.M., Epicier T. Anti-wear and friction reducing mechanisms of carbon nano-onions as lubricant additives, Tribology Letters, 2008, vol. 30, issue 1, pp. 69-80. DOI: 10.1007/s11249-008-9316-3.
11. Huang H.D., Tu J.P., Gan L.P., Li C.Z. An investigation on tribological properties of graphite nanosheets as oil additive, Wear, 2006, vol. 261, issue 2, pp. 140-144. DOI: 10.1016/j.wear.2005.09.010.
12. Zou T., Tu J., Huang H., Lai D., Zhang L., He D. Preparation and tribological properties of inorganic fullerene-like MoS2, Advanced Engineering Materials, 2006, vol. 8, issue 4, pp. 289-293. DOI: 10.1002/adem.200500218.
13. Huang H.D., Tu J.P., Zou T.Z., Zhang L.L., He D.N. Friction and wear properties of IF-MoS2 as additive in paraffin oil, Tribology Letters, 2005, vol. 20, issue 3-4, pp. 247-250. DOI: 10.1007/s11249-005-8552-z.
14. Wu Y.Y., Tsui W.C., Liu T.C. Experimental analysis of tribological properties of lubricating oils with nanoparticle additives, Wear, 2007, vol. 262, issue 7-8, pp. 819-825. DOI: 10.1016/j.wear.2006.08.021.
15. Damdinov B.B., Mitypov Ch.M. Vliyanie dobavok melkodispersnyh chastic metallov na harakteristiki smazochnyh materialov [Influence of finely dispersed metal particles additives on lubricants characteristics], Vestnik Buryatskogo gosudarstvennogo universiteta. Khimiya. Fizika, 2021, issue 1, pp. 28-42. (In Russian).
16. Orlov D.V., Mikhalev Yu.O., Myshkin N.K. Magnitnye zhidkosti v mashinostroenii [Magnetic fluids in mechanical engineering]. Moscow: Mashinostroenie Publ., 1993, 272 p. (In Russian).
17. Kurapov P.A. Magnitnye zhidkosti v kachestve smazochnyh materialov [Magnetic fluids as lubricants], Trenie i iznos [Friction and wear], 1994, vol. 15, issue 5, pp. 849-855. (In Russian).
18. Breki A.D., Tyurikova I.A., Shatulsky A.A., Gvozdev A.E., Kutepov S.N. Vliyanie magnitnyh nanochastic Fe3O4 na trenie i iznos stali 10H17N13M2T v rezhime vercheniya v srede smazochnogo masla [Influence of Fe3O4 magnetic nanoparticles on friction and wear rate of 10X17H13M2T steel at spinning mode in lubricating oil environment], Vestnik Rybinskoj gosudarstvennoj aviatsionnoj tekhnologicheskoj akademii im. P.A. Solov'eva, 2018, issue 4, pp. 103-111. (In Russian).
19. Huang W., Wang X., Ma G., Shen C. Study on the synthesis and tribological property of Fe3O4 based magnetic fluids, Tribology Letters, 2009, vol. 33, issue 3, pp. 187-192. DOI: 10.1007/s11249-008-9407-1.
20. Bajburtskij F.S. Magnitnye zhidkosti: sposoby polucheniya i oblasti primeneniya [Magnetic fluids: production methods and applications]. Available at: www.url: http://magneticliquid.narod.ru/autority/008.htm (accessed 18.06.2019).
21. Bolotov A.N., Novikov V.V., Novikova O.O. Studying tribotechnical properties of nanostructured lubricating oils with various dispersive media, Journal of Friction and Wear, 2017, vol. 38, issue 2, pp. 121-125. DOI: 10.3103/S1068366617020040.
22. Bolotov A.N., Novikova O.O., Novikov V.V. Pribornoe i metodicheskoe obespechenie nestandartnyh issledovanij magnitnyh nanodispersnyh smazochnyh masel [Instrumental and methodological support of the non-standard researches of the magnetic nanodispersed oils], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2017, issue 9, pp. 108-113. DOI: 10.26456/pcascnn/2017.9.108. (In Russian).
23. Gureev A.A., Fuks I.G., Lashkhi V.L. Khimmotologiya [Chemmotology], Moscow, Khimiya Publ., 1986, 368 p. (In Russian).
24. Garkunov D. N., Melnikov E. L., Gavrilyuk V. S. Tribotekhnika [Tribotechnics], Moscow, KNORUS Publ., 2017, 408 p. (In Russian).
25. Bolotov A.N., Lochagin A.N., Mikhalev Yu.O. Role of magnetic field in friction of surfaces lubricated by magnetic oil, Soviet Journal of Friction and Wear, 1988, vol. 9, no. 5, pp. 80-86.