多重碳纳米材料对润滑脂减摩性能的影响

Effect of Multiple Carbon Nanomaterials on Antifriction Performance of Grease

将还原氧化石墨烯和碳纳米管亲油改性后获得的改性还原氧化石墨烯(Modified Reduced Graphene Oxide,MR-GO)和改性碳纳米管(Modified Carbon Nanotubes,M-CNT),经复配后分别加入基础脂中.选用红外光谱仪等设备表征了纳米粒子改性结果,采用球盘式摩擦试验和四球试验测试了样品的摩擦性能,发现亲油改性能降低碳纳米添加剂对润滑的负面影响.研究表明,MR-GO和M-CNT复配的润滑脂具有较好的减摩性能,扫描电镜微观形貌观察表明,MR-GO和M-CNT均能改善摩擦表面的粗糙程度,在2种添加剂协作下,摩擦表面的自动修复作用更完善,使磨损面粗糙程度降低,摩擦表面平均摩擦因数更低且随摩擦时长的增加更平稳,形成了一种稳定可持续的润滑机制.

The modified reduced graphene oxide(MR-GO)and modified carbon nanotubes(M-CNT)were obtained through changing their lipophilicity,and then compounded into the base grease.The modification results of nano-particles were characterized by the infrared spectrometer and other equipments.The friction properties of the samples were evaluated by the ball-on-disk friction test and four-ball test.It was found that the lipophilic modification performance weakened the negative effect of carbon nano-particle agglomeration on lubrication,and the lubricating grease containing dual additives had a better anti-friction performance.Under the electron microscope,MR-GO and M-CNT could improve the roughness of the friction surface.Under the cooperation of the two additives,the self-repairing effect of the friction surface was more perfect,the friction coefficient of the friction surface was lower,and it could be more stable with the increase of the friction,thus forming a steady sustainable lubrication.