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Abstract
Zinc dialkyldithiophosphates (ZDDP) and a P-based ionic liquid (IL) were added in a polyalphaolefin base oil (PAO). Their tribological performance in steel-steel contacts in the boundary (BL) and “starved” elastohydrodynamic (sEHL) lubrication conditions were investigated.In BL conditions, IL reduces friction at 40 °C. It reduces both friction and wear at 100 °C. ZDDP reduces wear but has relatively high friction at both temperatures. Synergy between IL and ZDDP is observed only at 100 °C, due to the generation of a smoother worn surface and potentially a thicker boundary film.In sEHL conditions at room temperature, ZDDP, IL and their mixture change the inlet condition and increase lubricant film thickness. No synergy between the two additives is observed.
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