少层石墨烯负载纳米SiO2复合材料对水润滑性能的影响

采用液相超声直接剥离法制备了少层石墨烯负载纳米SiO₂复合材料,采用TEM对其形貌进行了表征,利用多功能往复摩擦磨损试验仪考察了少层石墨烯负载纳米SiO₂复合材料对水润滑性能的影响。通过SEM、XPS分别分析了磨损表面的形貌、元素组成及典型元素的化学状态,初步探讨了石墨烯负载纳米SiO₂复合材料在水中的润滑机理。结果表明:纳米SiO₂均匀分布于少层石墨烯片层表面和层间；其作为水润滑添加剂具有良好的减摩抗磨性能,这主要是由于石墨烯负载纳米SiO₂复合材料在磨损表面形成的摩擦化学反应膜与纳米SiO₂的自修复效应发生协同作用,抑制了Fe的氧化,并填补和修复了磨损表面,使磨痕表面的摩擦磨损减轻。

Effect of Less Graphene-based SiO2 Nanocomposite Materials on Water Lubricity Properties

Graphene-based with SiO₂ nanocomposite materials were prepared by the melthod of liquid-phase ultrasonic exfoliation. Morphologies of nanocomposite materials were characterized by means of TEM. their tribological properties as a pure water additive were investigated using multi-functional reciprocating friction and wear tester. The morphology, elemental composition and chemical states of typical elements were analyzed by SEM and XPS. The lubrication mechanism of graphene-loaded with SiO₂ nanocomposites in water was preliminarily discussed. The results showed that the nano SiO₂ evenly distributed in the few layer graphene layer and surface layer; the nanocomposite materials as a pure water additive displayed good friction-reducing and antiwear perfor-mance. The prosperity was attributed to the synergistic effect of the self-repairing effect of nano SiO₂ and friction chemical reaction film formed on the worn surface by graphene-loaded with SiO₂ nanocomposite which inhibited oxidation of Fe and repaired the wear surface, that reduced friction and wear on the frictional surface.