目的 研究离子液体和ZDDP添加剂的摩擦学性能以及协同作用机制，以降低ZDDP在工业润滑油中的用量或开发新添加剂。方法 选用聚α烯烃（PAO-4和PAO-8）为基础油，二烷基二硫代磷酸锌（ZDDP）和季膦盐油酸离子液体（Ionic Liquid，IL）为添加剂，在四球试验机上考察了添加剂对基础油摩擦磨损性能的影响及协同作用机制。采用扫描电子显微镜SEM和EDS对磨斑表面进行形貌和化学组分分析，利用表面粗糙度轮廓仪对磨斑进行了三维扫描并测量了其粗糙度，利用球盘式光干涉测量装置研究了添加剂对成膜特性的影响。结果 40 ℃时， ZDDP和IL复配物的摩擦系数介于ZDDP和IL之间。100 ℃时，基础油PAO4失效，添加ZDDP和IL复配物后，其摩擦系数降低至0.085，低于单独添加IL和ZDDP时的摩擦系数。基础油PAO8的摩擦系数约为0.11，单独添加IL与添加ZDDP和IL复配物后的摩擦系数非常接近（约为0.09）。 SEM图像显示，在40 ℃和100 ℃时向基础油中添加ZDDP和IL复配物，工况下对应的磨斑直径最小，且表面粗糙度值均小于基础油和基础油中添加ZDDP。卷吸速度为300 mm/s和450 mm/s时，单独添加IL或添加ZDDP和IL复配物，可提高润滑油的中心膜厚，有效缓解乏油状况。结论 与基础油相比，尤其是在高温环境下，ZDDP和离子液体复配时具有很好的减摩抗磨协同效应；混合润滑条件下，向基础油PAO中单独添加IL或ZDDP和IL复配物时，可有效减缓接触区内的乏油状况。

The work aims to reduce amount of ZDDP in industrial lubricants or to develop new additives by going into tribological properties and synergistic mechanism of IL and ZDDP additive. Polyalphaolefins (PAO-4 and PAO-8) were chosen as base oil, zinc dialkyl dithiophosphates (ZDDP) and quaternary phosphonium salt oleic acid ionic liquids (IL) were selected as additives. Effects of additives on friction and wear properties of base oil, and synergy mechanism were studied on four-ball testing machine. Morphology and chemical constituents of wear scars were analyzed with SEM and EDS. 3D morphology and roughness of scar surfaces were acquired with a surface roughness profilometer. Effects of additives on film forming characteristics were studied with a ball-disk optical interferometer. At the test temperature of 40 ℃, friction coefficient of ZDDP and IL compound fell in between that of ZDDP and IL. At 100 ℃, the base oil PAO4 failed, friction coefficient decreased to 0.085 after addition of ZDDP and IL compound, which was lower than that of base oil containing IL and ZDDP only. Friction coefficient of base PAO8 was about 0.11. Friction coefficient of the base oil containing IL only was close to that of solution containing ZDDP and IL compound (nearly 0.09). SEM images showed that wear scar diameter was the smallest when the ZDDP and IL compound was added to the base oil at 40 ℃ and 100 ℃, and surface roughness value was below that of base oil and ZDDP. At the entrainment speed of 300 mm/s and 450 mm/s, central film thickness of lubricating oil could be increased, and effectively oil starvation could be alleviated effectively when IL or ZDDP and IL compound was added. Compared with base oil, it is found that excellent synergistic effect of anti-friction and anti-wear can be achieved when ZDDP and IL are compounded, especially at the high temperature. Under mixed lubrication conditions, starvation conditions in the contact zone can be retarded effectively when IL alone or the ZDDP and IL compound is added to the base oil PAO.