Abstract
The advancement of electric vehicles demands lubricants with multifunction and performance. In this research, we investigated amphiphilic ZrP nanoparticles as lubricant additives. Experiments showed that the nanolubricant produced a tribofilm reduced the friction for 40% and wear 90%, while the electrical conductivity remained to be stable during tribotesting. Surface characterization of the tribofilm showed that there was a layered pyrophosphate on the wear track. The in situ impedance study about tribochemical kinetics revealed that the process in formation of a tribofilm involved simultaneous growth and wear. During growth, the coefficient of friction increased with continued formation of such film. During wear, the material removal rate was a function of friction, i.e., the higher the wear-rate, the higher the friction coefficient. The competing mechanisms of film growth and wear resulted in an electrically uniformed surface.
Issue Section:
Lubricants
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