Magnetic and electrical compatibility of transmission fluids additised with ionic liquids for Hybrid/EV lubrication

Authors: Rivera, N., Prado, J.I., Lugo, L., Iglesias, P., Hernández Battez, A. and Viesca, J.L.

Journal: Journal of Molecular Liquids

Volume: 398

ISSN: 0167-7322

DOI: 10.1016/j.molliq.2024.124217

Abstract:

The use of ionic liquids (ILs) has been reported as a potential additive in the formulation of transmission fluids for electric vehicles (EVs). These compounds affect important properties such as viscosity, tribological performance, electrical conductivity, among others. In addition, EVs generate magnetic fields that can also modify some of these properties. This work investigates the magnetic and electrical compatibility of three commercial automatic transmission fluids (ATFs) and their blends with four ILs. Rheological measurements at different shear rates, temperatures and magnetic field levels were also performed on these blends. The addition of ILs had minimal effect on the viscosity of ATF at lower IL concentrations, but variations in viscosity were found with decreasing temperature at higher IL concentrations. The electrical conductivity of the blends was not significantly affected at lower temperatures, but showed differences mainly related to IL concentration at higher temperatures, although the conductivity always remained within the dissipative range. Application of an external magnetic field did not alter the rheological behavior of either the ATF + IL blends or the pure magnetic ionic liquids (MILs). These ILs can potentially be used to improve tribological properties, as they are electrically and magnetically compatible.

Source: Scopus