针对大功率柴油机缸套较为苛刻的工况，采用离子碳氮/渗硫工艺对CrMoCu合金铸铁缸套试样内表面进行复合处理，将粒度为0.5 μm的FeS微粒按1%~4%的比例添加到润润滑油中，在试验载荷为300 N时考查FeS微粒添加量对复合改性层耐磨性的影响，在载荷为20~300 N范围内考查复合改性层与复合油协同作用的摩擦学性能,并探讨了其协同作用机理。结果表明：制备的复合改性层主要由Fe₃N，Fe₂C，FeS和FeS₂组成，较基体硬度提高了1.6倍；FeS微粒的最佳添加比例为2.5%，添加到润滑油中的FeS微粒可以不断地吸附到摩擦副表面上，形成吸附层并起固体润滑作用，弥补了渗硫层厚度较薄的缺点和润滑油单一润滑方式的不足；复合改性层表面渗硫层的疏松多孔结构有利于FeS微粒的吸附、储油和分子扩散等；摩擦化学反应生成的氧化物、硫化物、磷酸盐等边界薄膜，提升了试样表面的减摩、抗磨能力；高硬度的碳氮共渗层可对渗硫层、润滑油膜、边界薄膜以及吸附层等提供有效支撑，延长其减摩抗磨作用时间；轻载时，吸附和留存在摩擦副表面上的FeS微粒数量较少，复合改性层与含FeS微粒润滑油协同作用效果不明显；重载300 N时，协同作用优良，相对于润滑油润滑，缸套试样表面耐磨性提高了53.1%,环试样表面的耐磨性提高了49.9%。

In view of the harsh working conditions of diesel engine cylinder liner, the inner surface of CrMoCu alloy cast iron cylinder liner sample was compositely treated by ion carbonitrided/sulfurized process, 0.5 μm FeS particles were added to the lubricating oil with the proportion of 1% to 4%, and the influence of the amount of FeS particles on the wear resistance of composite modified layer was investigated under the test load of 300 N. The tribological properties of the synergistic effect of composite modified layer and FeS particle lubricating oil were investigated under the load range of 20 N to 300 N, and the interaction mechanism was discussed. The results show that the prepared composite modified layer is mainly composed of Fe₃N, Fe₂C, FeS and FeS₂ phases, and the hardness is 1.6 times higher than that of matrix. The optimal addition of FeS particles is 2.5%, the FeS particles added to the lubricating oil can be continuously adsorbed on the friction pair surface, which forms the adsorbed  layer and then plays a solid lubrication role. It supplements the thin thickness of sulfurized layer and the insufficiency of a single lubrication method. The porous structure of sulfurized layer is conducive to the adsorption, oil storage and molecular diffusion of FeS particles. The oxide, sulfide, phosphate and other boundary films generated by the tribochemical reaction improve the anti-friction and anti-wear ability of sample surface. The high-hardness carbonitrided layer can provide effective support for the sulfurized layer, lubricating oil film, boundary film and adsorption layer, and prolong its anti-wear effect time. The number of FeS particles adsorbed and retained on the surface of friction pair is less under light load，the synergistic effect of composite modified layer and lubricating oil containing FeS particles is not obvious. The synergistic effect is excellent under 300 N, which improves the wear resistance of cylinder liner sample surface by 53.1% and the wear resistance of ring specimen surface by 49.9%.