Good dispersion stability of lubricating oil blends added with graphene is the premise of playing its superior tribology property. In this paper, the dispersion stability of modified graphene in lubricating oil and the wear property of nanolubricating oil on the key friction pair for a diesel engine was studied by simulation and experiment. The results showed that the dispersion of modified graphene in lubricating oil was improved at ambient temperature and pressure and at high temperature and pressure. However, the dispersion effect of graphene at high temperature was slightly worse than that at ambient temperature. The wear property of lubricating oil blends added with modified graphene with a concentration of no more than 100 ppm was improved. With the increase of graphene addition, the wear reduction effect increased first and then decreased. The lubricating oil blend added with 25 ppm modified graphene is the best for wear reduction.

中文翻译：

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添加纳米石墨烯的柴油机润滑油分散稳定性和磨损性能研究

添加石墨烯的润滑油混合物良好的分散稳定性是发挥其优越的摩擦学性能的前提。本文通过仿真和实验研究了改性石墨烯在润滑油中的分散稳定性和纳米润滑油对柴油机关键摩擦副的磨损性能。结果表明，在常温常压和高温高压下，改性石墨烯在润滑油中的分散性得到改善。但石墨烯在高温下的分散效果比常温下稍差。添加浓度不超过100 ppm的改性石墨烯的润滑油混合物的磨损性能得到改善。随着石墨烯添加量的增加，减磨效果先增大后减小。