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STABILITY AND TRIBOLOGICAL PERFORMANCE OF NANOSTRUCTURED 2D TURBOSTRATIC GRAPHITE AND FUNCTIONALISED GRAPHENE AS LOW-VISCOSITY OIL ADDITIVES

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dc.creatorGUILHERME OLIVEIRA NEVES
dc.date2023
dc.date.accessioned2025-01-10T15:37:56Z
dc.date.available2025-01-10T15:37:56Z
dc.date.issued2023
dc.description.abstractTHE DISPERSION STABILITY OF CARBON-BASED SOLID LUBRICANTS/LUBRICATING OILS REMAINS A CHALLENGE TO OVERCOME. RECENTLY, NOVEL PROCESSING ROUTES WERE DEVELOPED TO OBTAIN 2D TURBOSTRATIC GRAPHITE PARTICLES VIA SOLID-STATE REACTIONS BETWEEN B4C AND CR3C2 (GBC) AND BETWEEN SIC AND FE (GSF) THAT PRESENT OUTSTANDING TRIBOLOGICAL PROPERTIES IN A DRY SCENARIO, AS WELL AS FUNCTIONALIZED GRAPHENE (GNH). THIS WORK INVESTIGATED THE SUSPENSION STABILITY OF GBC AND GSF PARTICLES (0.05 WT.%) DISPERSED IN A LOW-VISCOSITY POLYOL ESTER LUBRICATING OIL AND THEIR TRIBOLOGICAL PERFORMANCE. AMMONIA-FUNCTIONALIZED GRAPHENE (GNH) PARTICLES WERE ALSO USED AS A REFERENCE. IN ORDER TO EVALUATE THE DISPERSION STABILITY, IN ADDITION TO THE CLASSICAL DIGITAL IMAGE TECHNIQUE, A MUCH MORE ASSERTIVE, RELIABLE, QUANTITATIVE AND RARELY REPORTED IN THE LITERATURE TECHNIQUE WAS USED, I.E., THE STEPTM (SPACE AND TIME-RESOLVED EXTINCTION PROFILES) TECHNOLOGY. RECIPROCATING SPHERE-ON-FLAT TRIBOLOGICAL TESTS WERE CARRIED OUT, IN WHICH BEFORE CONTACT, 0.2 ?L OF PURE OIL AND SUSPENSION (POE + 0.05 WT.% OF SOLID LUBRICANT) WAS APPLIED ON A FLAT SURFACE. THE RESULTS SHOWED THAT THE GBC PARTICLES REMAINED REMARKABLY STABLE AND REDUCED THE SPHERE WEAR RATE BY 61.8%. FROM THE TRIBOSYSTEM POINT OF VIEW, THE PRESENCE OF GBC AND GSF REDUCED THE WEAR RATE BY 18.4% AND 2.2%, RESPECTIVELY, WITH RESPECT TO THE PURE OIL, WHILE THE GNH PARTICLES INCREASED THE WEAR RATE BY 4.2%. FURTHERMORE, THE WEAR RATE WAS IMPROVED DUE TO THE HIGHLY DISORDERED CARBON TRIBOLAYER FORMATION IDENTIFIED ON BOTH SURFACES.
dc.formatapplication/pdf
dc.identifier.doi10.3390/lubricants11040155
dc.identifier.issn2075-4442
dc.identifier.urihttps://repositorio.ubiobio.cl/handle/123456789/12928
dc.languagespa
dc.publisherLUBRICANTS
dc.relation.uri10.3390/lubricants11040155
dc.rightsPUBLICADA
dc.subjecttribology
dc.subjectsuspension stability
dc.subjectlubrication
dc.subjectgraphene
dc.subject2D graphite
dc.titleSTABILITY AND TRIBOLOGICAL PERFORMANCE OF NANOSTRUCTURED 2D TURBOSTRATIC GRAPHITE AND FUNCTIONALISED GRAPHENE AS LOW-VISCOSITY OIL ADDITIVES
dc.typeARTÍCULO
dspace.entity.typePublication
ubb.EstadoPUBLICADA
ubb.Otra ReparticionDEPARTAMENTO DE INGENIERIA MECANICA
ubb.SedeCONCEPCIÓN
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