Abstract This work investigated the effect of nanodiamond (ND) additives on the tribological properties of CrN-coated piston ring mating with the chromium-plated and BP alloy iron cylinder liners, which is one of the key friction pairs in the internal combustion engines. To enhance the dispersion of the NDs in the base oil, the surface of ND particles was modified with polyaniline via in situ polymerization. The friction and wear as well as the scuffing characteristics of the friction pair lubricated with different contents of ND composite-added base oil were evaluated by using the reciprocating tribotests, which are close to the actual conditions. The wear surface morphologies and elements distribution were analyzed to explore the wear behaviors and the associated mechanisms of friction pairs under the lubrication incorporated with the ND composites. The results show that the ND additive is beneficial for the pair of Cr liner and CrN-coated piston ring in the friction and wear as well as scuffing properties, and the best concentration of ND additive is expected to be around 1 wt%. But for the BP liner, the developed nanocomposite has a negative impact. The friction force and the wear loss of the pair lubricated by the ND composite-added oil are even worse than that tested with the base lubricating oil.

中文翻译：

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纳米金刚石复合材料分散润滑剂在与 CrN 活塞环配合的商用气缸套上的摩擦学性能

摘要 本工作研究了纳米金刚石 (ND) 添加剂对 CrN 涂层活塞环与镀铬和 BP 合金铁缸套的摩擦学性能的影响，该缸套是内燃机中的关键摩擦副之一。为了提高NDs在基础油中的分散性，ND颗粒的表面通过原位聚合用聚苯胺改性。采用往复式摩擦试验对不同掺ND复合基础油润滑的摩擦副的摩擦磨损及擦伤特性进行了评价，接近于实际情况。对磨损表面形貌和元素分布进行了分析，以探索在掺入 ND 复合材料的润滑下摩擦副的磨损行为和相关机制。结果表明，ND添加剂有利于Cr衬套和CrN涂层活塞环的摩擦磨损和擦伤性能，ND添加剂的最佳浓度预计在1wt%左右。但对于 BP 衬垫，开发的纳米复合材料具有负面影响。ND复合添加油润滑的副摩擦力和磨损损失甚至比基础润滑油测试的还要差。ND添加剂的最佳浓度预计在1wt%左右。但对于 BP 衬垫，开发的纳米复合材料具有负面影响。ND复合添加油润滑的副摩擦力和磨损损失甚至比基础润滑油测试的还要差。ND添加剂的最佳浓度预计在1wt%左右。但对于 BP 衬垫，开发的纳米复合材料具有负面影响。ND复合添加油润滑的副摩擦力和磨损损失甚至比基础润滑油测试的还要差。