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Selective synergy of 1,3-diketone for different base oil to promote the realization of oil-based superlubricity
Friction
Published: 23 January 2025
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The mixed lubricant prepared by mixing 1-(4-ethylphenyl)-nonane-1,3-dione (0206) and chelate (0206-Fe) in a ratio of 4:6 had better tribological properties than 0206. In this study, it was found that the mixed lubricant prepared by mixing alkane lubricants with 0206-Fe(60%) at a ratio of 2:8 can not only achieve superlubricity, but also reduce the wear scar diameter (WSD) of the friction pairs. The mixed solution prepared by the four polar solutions with 0206-Fe(60%) cannot achieve superlubricity. The results of surface analysis and molecular dynamics (MD) simulation showed that the four polar molecules were preferentially adsorbed on the metal surface, occupying the diketone adsorption sites, and the adsorption layer formed by them cannot produce synergistic lubrication with the chelates.

Open Access Research Article Issue
Combination of diketone and PAO to achieve macroscale oil-based superlubricity at relative high contact pressures
Friction 2024, 12(5): 869-883
Published: 12 January 2024
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1-(4-ethylphenyl)-nonane-1,3-dione (0206) is an oil-soluble liquid molecule with rod-like structure. In this study, the chelate (0206-Fe) with octahedral structure was prepared by the reaction of ferric chloride and 1,3-diketone. The experimental results show that when using 0206 and a mixed solution containing 60% 0206-Fe and 40% 0206 (0206-Fe(60%)) as lubricants of the steel friction pairs, superlubricity can be achieved (0.007, 0.006). But their wear scar diameters (WSD) were very large (532 μm, 370 μm), which resulted in the pressure of only 44.3 and 61.8 MPa in the contact areas of the friction pairs. When 0206-Fe(60%) was mixed with PAO6, it was found that the friction coefficient (COF) decreased with increase of 0206-Fe(60%) in the solution. When the ratio of 0206-Fe(60%) to PAO6 was 8:2 (PAO6(20%)), it exhibited better comprehensive tribological properties (232.3 MPa). Subsequent studies have shown that reducing the viscosity of the base oil in the mixed solution helped to reduce COF and increased WSD. Considering the COF, contact pressure, and running-in time, it was found that the mixed lubricant (Oil3(20%)) prepared by the base oil with a viscosity of 19.7 mPa∙s (Oil3) and 0206-Fe(60%) exhibited the best tribological properties ( 0.007, 161.4 MPa, 3,100 s).

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