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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 graphene-loaded nano-LaF_3 composite was prepared by liquid-phase ultrasonic direct stripping method. The morphology of the nano-LaF_3 composite was characterized by SEM and TEM. The effects of graphene-loaded nano LaF_3 composite in pure water The friction and wear properties. The morphology of wear scar and the chemical state of typical elements were analyzed by SEM and XPS, respectively. The lubrication mechanism of graphene loaded nano-LaF_3 composite in pure water was preliminarily discussed. The results show that nano-sized LaF_3 uniformly distributes on the surface and interlayer of multi-graphene sheets and has a particle size of 5 ~ 50 nm. As a pure water additive, LaF_3 has good anti-friction and anti-wear properties. For example, 0.01% (mass fraction), the average friction coefficient and wear volume decreased by 34.35% and 52.40%, respectively, compared with pure water lubrication, which was mainly due to the wear of the composites The adsorbed film formed on the surface and the tribochemical reaction film have a synergistic effect, which changes the wear mechanism of water, inhibits the oxidation of Fe, and reduces the friction and wear of the friction surface.