目的 探究硅烷偶联剂对缸套表面微坑复合PTFE微粒的减摩和缓释性能的影响。方法 利用激光刻蚀机在缸套表面加工不同参数的微坑，并依据摩擦系数对表面微坑参数进行优化。选取最佳表面微坑参数，进行加工，并机械涂覆经硅烷偶联剂修饰的PTFE，制备复合润滑结构。采取往复式摩擦磨损试验机对复合润滑结构的减摩性能进行分析。利用SEM和EDS研究摩擦副的表面形貌和成分，采用三维共聚焦显微镜研究微坑内PTFE的释放情况。结果 在热压复合方法下，直径为0.4 mm、深度为120 μm的微坑复合PTFE具有最佳的减摩效果。硅烷偶联剂的加入会进一步改善摩擦副之间的减摩性能，其摩擦系数为0.1248。与未处理缸套试样、微坑处理缸套试样、热压复合PTFE缸套试样进行对比，其摩擦系数分别降低了24.3%、18.8%和11.2%。另外，硅烷偶联剂还可以减缓表面微坑内PTFE的释放，延长作用时效，与热压复合方法相比，微坑内PTFE颗粒的释放速率约降低96.3%。结论 复合润滑结构能够改善摩擦副之间的摩擦状况，其减摩和缓释机理是固体自润滑材料、表面微坑和硅烷偶联剂协同作用的结果。

The work aims to investigate the effect of silane coupling agent (SCA) on the anti-friction and sustained release properties of the cylinder with the micro dimples filled with PTFE particles. The micro dimples with different parameters were processed on the surface of the cylinder by laser etching machine, and the parameters were optimized according to friction coefficient. The composite lubrication structure was prepared with SCA modified PTFE by the optimal micro dimples parameters through by smearing method. The anti-friction property of the lubrication structure was tested by a reciprocating test rig. The surface morphology and composition of the cylinder were analyzed by SEM and EDS. The release behavior of PTFE in the micro dimples was studied by a three-dimensional surface profiler. The PTFE filled micro dimple with diameter of 0.4 mm and depth of 120 μm showed the best anti-friction effect under hot-pressed method. Moreover, the addition of the SCA further improved the anti-friction effect between friction pairs and the friction coefficient was 0.1248, which decreased by 24.3%, 18.8% and 11.2%, respectively when compared with that of the untreated cylinder, the cylinder with micro dimples and the PTFE cylinder under hot-pressed method, the coefficient of friction. Furthermore, SCA could also reduce the release of PTFE in micro dimples on the surface and extend the time effect and make the releasing rate of PTFE particles in the micro dimples decrease by 96.3% when compared with hot-pressed method. The composite lubrication structure can improve the friction condition between friction pairs and its friction reduction and slow release mechanism is the result of the synergistic effect of solid self-lubricating material, surface micro dimples and SCA.