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Tribological Properties of Oleylamine-Modified Ultrathin WS2 Nanosheets as the Additive in Polyalpha Olefin Over a Wide Temperature Range

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Abstract

Ultrathin WS2 nanosheets modified by oleylamine (OM) were prepared via a solution-phase method at a relatively high temperature of 300 °C. The thermal stability of the as-prepared WS2 nanosheets was evaluated by thermogravimetric analysis. The tribological properties of as-synthesized WS2 nanosheets as the additive in polyalpha olefin (PAO6) were evaluated with a four-ball machine and a reciprocating tribometer over a wide temperature range from room temperature to 200 °C. The morphology and elemental composition of worn steel surfaces were analyzed with a scanning electron microscope, a three-dimensional optical profiler, an energy dispersive spectrometer and an X-ray photoelectron spectroscope. Results show that OM as the modifier is able to improve the dispersibility of WS2 nanosheets in PAO6 base oil. At a mass fraction of 2.0 % in PAO6 base oil, as-synthesized WS2 nanosheets exhibit excellent antiwear and friction-reducing performance over the selected temperature range. This is because as-synthesized WS2 nanosheets as the additive in PAO6 are able to form adsorbed film with a low shear force and tribochemical reaction film composed of W, Fe and O elements on the worn steel surface.

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Acknowledgments

The authors acknowledge the financial support provided by the Ministry of Science and Technology of China (Project of “973” plan; Grant No. 2013CB632303), National Natural Science Foundation of China (Grant No. 51275154, 51405132), Plan for Young Scientific Innovation Talent of Henan Province (Grant No. 154100510018), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (C20150011) and Natural Science Foundation of Henan Province (Grant No. 14A15006).

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Correspondence to Shengmao Zhang.

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Jiang, Z., Zhang, Y., Yang, G. et al. Tribological Properties of Oleylamine-Modified Ultrathin WS2 Nanosheets as the Additive in Polyalpha Olefin Over a Wide Temperature Range. Tribol Lett 61, 24 (2016). https://doi.org/10.1007/s11249-016-0643-5

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Keywords

  • WS2 nanosheet
  • Polyalpha olefin
  • Lubricant additive
  • Tribological properties