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In situ synthesis of graphene nitride nanolayers on glycerol-lubricated Si3N4 for superlubricity applications

Abstract : The increasing demand for sustainable tribology has accelerated the development of environmentally friendly lubrication solutions such as water or water-related lubricants. Earlier works have reported on water-lubricated sliding of silicon nitride (Si3N4) at high speeds, which can result in a superlow friction (m < 0.01) owing to the formation of hydrodynamic water films on hydrophilic surface layers. Here, combined boundary-lubrication experiments at low sliding speeds and atomistic simulations reveal an alternative superlubricity mechanism for glycerol-lubricated Si3N4. X-ray photoelectron and time-of-flight secondary ion mass spectrometry performed inside and outside the wear track as well as high-resolution mass spectroscopy of the used lubricant strongly suggest that sub-nanometer-thick graphene nitride layers form at the very top of Si3N4. In the accompanying atomistic simulations, glycerol molecules undergo tribochemical decomposition and react with surface-bound nitrogen atoms to form carbon nitrides. Further shearing promotes the formation of 2D graphene nitrides that passivate the ceramic surfaces and induce a superlow friction under boundary lubrication. Thus, glycerol-lubricated Si3N4 has a high potential for use in green superlubricity enabled by in situ synthesis of disordered graphene nitride species.
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https://hal.archives-ouvertes.fr/hal-03660141
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Soumis le : vendredi 6 mai 2022 - 07:32:56
Dernière modification le : dimanche 26 juin 2022 - 02:04:40

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y. Long, T. Kuwahara, M.-I. de Barros Bouchet, A. Ristić, N. Dörr, et al.. In situ synthesis of graphene nitride nanolayers on glycerol-lubricated Si3N4 for superlubricity applications. ACS Applied Nano Materials, American Chemical Society, 2021, 4 (3), pp.2721-2732. ⟨10.1021/acsanm.0c03362⟩. ⟨hal-03660141⟩

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