Tribological improvement of potential lubricants for electric vehicles using double functionalized graphene oxide as additives
- Liñeira del Río, José M.
- Alonso Pérez, Gabriel
- Martínez, Adrián
- Peña, Diego
- Fernández, Josefa
ISSN: 0301-679X
Ano de publicación: 2024
Volume: 193
Páxinas: 109402
Tipo: Artigo
Outras publicacións en: Tribology International
Resumo
The aim of the present research is to analyze thermophysical and tribological properties of PAO4 nanolubricants containing functionalized (GO-polyethyleneimine-oleic acid, GO-PEI-OA) and non-functionalized (GO) graphene oxide. Nanodispersions of these NPs were prepared, observing a better stability for the GO-PEI-OA nanolubricants. As for the tribological properties, significant improvements in coefficient of friction were obtained comparing with the base oil, being 28% for GO-PEI-OA (0.10 wt%). Concerning the anti-wear behavior, better results were obtained for GO-PEI-OA nanolubricants (0.15 wt%) with improvements of about 27%, 54% and 60% for the diameter, depth, and area of the wear track, respectively. Finally, Raman spectroscopy and surface roughness measurements were used to identify the tribological mechanisms of tribofilm formation and repairing.
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