氧化石墨烯/镍纳米润滑添加剂的润滑性能

Lubricating Property of Graphene Oxide/Ni Nanoparticles as Lubricant Additive

目前有关氧化石墨烯表面负载金属纳米颗粒作为润滑添加剂的研究不多。为此,利用化学沉淀法制备了氧化石墨烯/镍纳米润滑复合材料,利用透射电镜(TEM)、扫描电镜(SEM)和X射线衍射仪(XRD)对样品进行表征。将氧化石墨烯和氧化石墨烯/镍纳米材料作为润滑添加剂分别添加到液体石蜡中,利用四球摩擦磨损试验机分别考察其摩擦学性能。结果表明:相对于纯液体石蜡,添加氧化石墨烯/镍纳米润滑复合材料的液体石蜡和添加氧化石墨烯的液体石蜡的润滑效果都有提高,且添加氧化石墨烯/镍纳米复合材料时润滑效果最好。氧化石墨烯/镍纳米复合材料添加量为0.08%时润滑效果最好,相对于纯液体石蜡,摩擦系数和磨斑直径分别降低了18%和22%。

Composite material of graphene oxide dotted with Ni nanoparticles was synthesized by chemical precipitation method, and then was characterized by transmission electron microscopy （TEMs）, scanning electron microscopy （SEM） and X- ray diffractometer （XRD）. Moreover, the composite material was added to paraffin oil as lubricating additives, and the tribological properties were tested using a four-ball tribometer. Results showed that both the paraffin oil with graphene oxide/Ni nanoparticles and paraffin oil with the graphene oxide as lubricant additive had the better lubricating effects than the pure paraffin oil, and the effect was the best when the graphene oxide/Ni nanoparticles were added. When the dosage of graphene oxide/Ni nanoparticles composite material was 0.08%, the modified paraffin oil had the optimal lubrication effect, which could reduce the friction coefficient and wear scar diameter by 18 % and 22 %, respectively, in comparison with the pure oil.