目的：分析两种类金刚石碳(DLC)涂层的成分和结构差异，研究涂层本质特征在发动机减摩降耗方面的应用。方法测试分析涂层成分和表面形貌，讨论在活塞销表面沉积 DLC 涂层对零件材料组织和硬度的影响，验证活塞销沉积 DLC 涂层后对发动机机械损失功率的影响，并运用转移膜和石墨化两种摩擦机制进行分析讨论。结果标杆试样的涂层较厚，为 W 掺杂的 DLC 涂层，且其致密度、均匀性及膜/基结合状态均优于在研涂层技术；成品活塞销沉积 DLC 涂层后，当转速介于2200~4000 r/ min 范围内时，涂层表现出提高发动机动力性的作用。结论 DLC 涂层应用可有效改善活塞销的表面状态，减缓零件工作条件下的磨损，延长活塞销的使用寿命。
Objective To analyze the diversity of the composition and structure of the two kinds diamond-like carbon (DLC) film and study its application of anti-friction in the engine. Methods The composition and surface morphology of the film were ana-lyzed, the effect of DLC film on the surface of piston pin on the components organization material and hardness was discussed, the influence of the application of the DLC film on piston pin on engine mechanical loss power was verified, tribological mechanism of membrane and graphitization were analyzed and discussed. Results Benchmark coating was W-doped DLC films and was thicker. Benchmark coating specimens were better than the research coating technology in the phase density, uniformity and the bonding state. After the application of finished piston pin on DLC coating,it showed that the power performance of engine had been im-proved when the speed between the ranges of 2200 ~ 4000 r/ min. Conclusion Application of DLC film can effectively improve the surface state of piston pin and reduce parts wear under the working conditions, and thus extends the service life of piston pin.
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