Combination of diketone and PAO to achieve macroscale oil-based superlubricity at relative high contact pressures

Shaonan DU; Chenhui ZHANG; Zhi LUO

doi:10.1007/s40544-023-0767-1

Friction 2024, 12(5): 869-883 https://doi.org/10.1007/s40544-023-0767-1

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Open Access | Issue | Published: 12 January 2024

Combination of diketone and PAO to achieve macroscale oil-based superlubricity at relative high contact pressures

Show Author's Information Hide Author's Information Shaonan DU^¹, Chenhui ZHANG^¹(

), Zhi LUO^²(

)

1 State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China

2 Beijing National Laboratory of Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Keywords:

superlubricity, diketone, chelate, oil-based lubricants

Cite this article:

DU S, ZHANG C, LUO Z. Combination of diketone and PAO to achieve macroscale oil-based superlubricity at relative high contact pressures. Friction, 2024, 12(5): 869-883. https://doi.org/10.1007/s40544-023-0767-1

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Abstract

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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Combination of diketone and PAO to achieve macroscale oil-based superlubricity at relative high contact pressures

Show Author's information Hide Author's Information Shaonan DU^¹, Chenhui ZHANG^¹(

), Zhi LUO^²(

)

1 State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China

2 Beijing National Laboratory of Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Abstract

Keywords: superlubricity, diketone, chelate, oil-based lubricants

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Publication history

Received: 04 January 2023

Revised: 28 February 2023

Accepted: 21 March 2023

Published: 12 January 2024

Issue date: May 2024

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Acknowledgements

The work is financially supported by the National Key R&D Program of China (No. 2020YFA0711003), the National Natural Science Foundation of China (No. 51925506), and the XPLORER PRIZE.

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