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.

将二烷基二硫代磷酸锌（ZDDP）和P基离子液体（IL）添加到聚α-烯烃基础油（PAO）中。研究了它们在边界（BL）和“饥饿”弹性流体力学（sEHL）润滑条件下的钢-钢接触中的摩擦学性能。

在BL条件下，IL可降低40°C时的摩擦。它可降低100°C时的摩擦和磨损。ZDDP减少了磨损，但在两个温度下均具有相对较高的摩擦力。仅在100°C时才能观察到IL和ZDDP之间的协同作用，这是由于产生了更光滑的磨损表面以及可能更厚的边界膜。

在室温下的sEHL条件下，ZDDP，IL及其混合物会改变入口条件并增加润滑剂膜厚度。没有观察到两种添加剂之间的协同作用。