Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 366, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2022.120271
Keywords
Transmission fluids; Nanocomposites; Electric vehicles; Tribological mechanisms; Friction; Wear
Funding
- Xunta de Galicia [ED431C 2020/10]
- State Research Agency (AEI) of Spain
- European Regional Development Fund (ERDF, FEDER in Spanish) [PID2020-112846RB-C22]
- Program for the requalification, international mobility, and attraction of talent in the Spanish university system
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This research investigates the use of Mn3O4-graphene nanocomposites as additives in electric vehicle transmission oils. The results show that adding Mn3O4-G nanoparticles can effectively reduce friction and wear, with the nanolubricant containing 0.075 wt% Mn3O4-G exhibiting the best performance.
This research reports the antifriction and antiwear properties of Mn3O4-Graphene nanocomposites (Mn3O4-G) as additives of a paraffinic base oil commonly used in the formulation of electric vehicles transmission oils, G-III base oil. Four G-III base oil nanodispersions have been designed, G-III base oil + 0.025 wt% Mn3O4-G, G-III base oil + 0.050 wt% Mn3O4-G, G-III base oil + 0.075 wt% Mn3O4-G and G-III base oil + 0.100 wt% Mn3O4-G, to know the optimal concentration of nanoadditive. Tribological experiments were carried out with these nanolubricants and with neat G-III base oil at pure sliding con-ditions under a working load of 9.43 N. All tested nanolubricants led to similar friction coefficients in comparison to that obtained using G-III base oil. Tribological specimens tested with formulated nanolu-bricants revealed less wear than that obtained with G-III base oil, obtaining the greatest wear reduction using the G-III base oil + 0.075 wt% Mn3O4-G nanolubricant, with reductions of 25, 50 and 64% in wear scar diameter, maximum depth and transversal area, respectively. Moreover, by means of confocal Raman microscopy and roughness evaluation of worn tribological specimens, it was concluded that syn-ergetic effect, tribofilm formation and rolling mechanisms happen.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
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