采用液相超声直接剥离法制备了石墨烯负载纳米LaF3复合材料,用SEM、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石墨烯负载纳米LaF3复合材料在纯水中的摩擦磨损性能.通过SEM、XPS分别分析了磨痕表面的形貌、典型元素的化学状态,初步探讨了石墨烯负载纳米LaF3复合材料在纯水中的润滑机理.结果表明:纳米LaF3均匀分布于多层石墨烯片层表面和层间,其粒径为5～50 nm;其作为纯水添加剂具有良好的减摩抗磨性能,如试验载荷10N,添加剂浓度0.01％(质量分数)时,与纯水润滑时相比,石墨烯负载纳米LaF3复合材料水分散体系润滑下平均摩擦系数和磨损体积分别下降34.35％和52.40％,这主要是由于复合材料在磨损表面形成的吸附膜、摩擦化学反应膜发生协同作用,改变了水的磨损机理,抑制了Fe的氧化,使得摩擦表面的摩擦磨损得到减轻.
Graphene-based LaF3(GN/LaF3) nanoeomposite materials were prepared by Liquid-phase Ultrasonic Exfoliation.The morphologies of GN/LaF3 nanocomposite materials were characterized by SEM and TEM.The tribological properties of the nanocomposite materials as a water additive were investigated using a multi-functional reciprocating friction and wear tester.The lubrication mechanism was discussed based on the results of SEM,and XPS.The results show that the LaF3 nanoparticles with the size of 5～50 nm,are densely and homogeneously deposited on the surface of multilayer graphene sheets.The GN/LaF3 nanocomposite materials exhibit good friction-reducing and anti-wear performance.Compared with pure water,it can reduce the friction coefficient by 34.35％ and the wear mass by 52.40％ under the load 10 N and concentration 0.01 wt％.It is attributed to the effect of the adsorption membrane and tribochemistry reaction films which inhibit the oxidation of Fe and reduce the wear.
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