dc.contributorBarbosa, Cleiton Rubens Formiga
dc.contributor
dc.contributorhttp://lattes.cnpq.br/5632792751894790
dc.contributor
dc.contributorhttp://lattes.cnpq.br/8673332414572221
dc.contributorFontes, Francisco de Assis Oliveira
dc.contributor
dc.contributorhttp://lattes.cnpq.br/9043538628554844
dc.contributorAlves, Salete Martins
dc.contributor
dc.contributorhttp://lattes.cnpq.br/8550161853747323
dc.contributorBandarra Filho, Enio Pedone
dc.contributor
dc.contributorhttp://lattes.cnpq.br/8157552858330455
dc.contributorAlmeida, Igor Marcel Gomes
dc.contributor
dc.contributorhttp://lattes.cnpq.br/2914541046309057
dc.creatorHolanda, Raphael Araújo de
dc.date.accessioned2021-02-12T19:37:16Z
dc.date.accessioned2022-10-05T23:03:57Z
dc.date.available2021-02-12T19:37:16Z
dc.date.available2022-10-05T23:03:57Z
dc.date.created2021-02-12T19:37:16Z
dc.date.issued2018-07-07
dc.identifierHOLANDA, Raphael Araújo de. Avaliação experimental de nanolubrificante híbrido composto de Al2O3 e grafite. 2018. 130f. Tese (Doutorado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2018.
dc.identifierhttps://repositorio.ufrn.br/handle/123456789/31524
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3945871
dc.description.abstractHybrid nanolubricants are obtained by the addition of two or more dissimilar types of nanoparticles to the base lubricant and have numerous applications in several engineering segments. In this research was evaluated a new composition of hybrid nanolubricant from the addition of the nanoparticles of Al2O3 and graphite varying the concentration from 0.1 g / L to 2.0 g / L in the mass ratio of 50/50 for a lubricant POE oil for application in refrigeration system. Alumina nanoparticles were commercially acquired, while the graphite nanoparticles were developed in a high energy planetary mill, both of which were characterized by MEV, MEV-FEG, DRX, FRX, EDX and Particle Sizing. The hybrid nanolubricant samples were prepared through the two-step method with duration of 24 hours in the stage of sonication and 24 hours in the stage of rotary agitation. Subsequently the hybrid nanolubricant samples were evaluated for stability through visual inspection, particle sizing, Zeta potential and hydrogenation potential. They were also submitted to the experimental analyzes for the measurement of the thermo-rheological properties, through the essays of density, thermal conductivity, dynamic viscosity, shear stress and strain rate. As well as the tribological performance analysis for the characterization of the efficiency of the hybrid nanolubricant in comparison to the lubricant POE oil reference. From the evaluations developed in this research, it was concluded that the changes observed in the thermo-rheological properties and tribological performance of the proposed hybrid nanolubricants, were not positive in relation to the lubricant POE oil reference.
dc.publisherUniversidade Federal do Rio Grande do Norte
dc.publisherBrasil
dc.publisherUFRN
dc.publisherPROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA MECÂNICA
dc.rightsAcesso Aberto
dc.subjectNanolubrificante híbrido
dc.subjectNanopartículas de alumina
dc.subjectNanopartículas de grafite
dc.subjectTermo-reologia
dc.subjectDesempenho tribológico
dc.titleAvaliação experimental de nanolubrificante híbrido composto de Al2O3 e grafite
dc.typedoctoralThesis


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