Tested in boundary lubrication, inorganic fullerene-like WS2 nanoparticles used as additives in oil present interesting friction reducing and anti-wear properties. A dispersion with only 1 wt% of particles leads, from a contact pressure of 0.83 GPa, to a drastic decrease of the friction coefficient below 0.04 and to very low wear. High resolution transmission electron microscopy (HRTEM), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Raman Spectroscopy and video imaging were used to explain the lubrication mechanisms. A structural modification of fullerene-like nanoparticles into sheets during the friction test was evidenced to be the main effect at the origin of these properties.
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Joly-Pottuz, L., Dassenoy, F., Belin, M. et al. Ultralow-friction and wear properties of IF-WS2 under boundary lubrication. Tribol Lett 18, 477–485 (2005). https://doi.org/10.1007/s11249-005-3607-8
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DOI: https://doi.org/10.1007/s11249-005-3607-8