石墨烯负载纳米LaF_3复合材料的摩擦学性能

采用液相超声直接剥离法制备了石墨烯负载纳米LaF_3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LaF_3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LaF_3复合材料在纯水中的润滑机理。结果表明:纳米LaF_3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10 N,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LaF_3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。

The Tribological Properties of Graphene-based LaF3 Nanocomposite Matirials

Graphene-based LaF₃ (GN/LaF₃)nanocomposite materials were prepared by the melthod of Liquid-phase Ultrasonic Exfoliation. The morphologies of GN/LaF₃nanocomposite materials were charactered by means of SEM, TEM. Its tribological properties as water additive were investigated using an multi-functional reciprocating friction and wear tester. The lubrication mechanism was discussed based on the results of analysises of SEM, XPS. The results showed that the LaF₃nanoparticles, at the size of 5-50nm, were densely and randomly deposited on the surface of multilayer graphene sheets. The GN/LaF₃nanocomposite materials express good friction-reducing and antiwear performance. Compared with pure water, it can reduce the friction coefficient at 34.35% and the wear mass fall at 52.40% with the load 10N and concentration 0.01wt%. The prosperity is attributed to the effection of the adsorption membrane and tribochemistry reaction films which inhibit the oxidation of Fe and reduce the wear.