石墨烯负载纳米金属颗粒的超临界化学沉积制备及其摩擦行为协同润滑机理研究

基于石墨烯负载金属纳米颗粒作为润滑添加剂的潜在应用价值及超临界沉积技术在制备负载金属纳米颗粒的优势，本项目拟采用超临界二氧化碳（sc-CO2）化学沉积制备负载金属纳米颗粒石墨烯基新型纳米润滑添加剂。研究不同超临界沉积条件下金属纳米粒子在石墨烯表面的吸附、成核和生长机制，通过控制超临界化学沉积条件及反应物配比控制制备的石墨烯负载金属纳米颗粒的微观形态结构，改善其在润滑油中的分散性及摩擦学性能。研究石墨烯负载金属纳米颗粒作为润滑添加剂在各种条件下的摩擦磨损性能和机理，阐明石墨烯与金属纳米颗粒在摩擦过程中的作用机制和协同润滑机理，在此基础上，揭示石墨烯负载金属纳米颗粒的超临界沉积条件-微观形态结构特征-摩擦磨损和协同润滑机理的内在联系。本项目的实施对纳米润滑添加剂的摩擦物理化学理论及纳米复合材料的协同润滑机理研究具有重要的理论意义，为制备新型纳米润滑添加剂材料提供了新方法和理论依据。

Due to the potential applications of graphene doped with nanometal particles as lubricating oil additive and the advantages of supercritical fluid-assisted deposition for synthesizing nanoparticle-filled nanocomposites, the project focus on the preparation of new lubricating oil additives that is based on graphene doped with nanometal particles by supercritical CO2 assisted-deposition. Adsorption, nucleation, growth and formation mechanism of the nanometal particles on the surface of graphene will be investigated. The microstructure and morphology of the graphene/nanoparticles will be optimized by adjusting the condition of supercritical CO2 assisted-deposition and the components of the reactants to improve the dispersion level and tribological properties of the as-prepared nanocomposites in lubricating oil. The friction and wear behaviors and the corresponding wear mechanisms of the graphene/nanoparticle as lubricating oil additive will be evaluated under different conditions. The action mechanism and the synergistic lubricating mechanism of the graphene and the incorporated nanoparticles will be elaborated. Finally, the correlation between the preparation condition, microstructure, friction and wear mechanism, and the synergistic lubricating mechanism of the graphene doped with nanometal particles will be established in this project. The project has an important theoretical significance to elaborate the physical and chemical friction theory and the synergistic lubricating mechanism of the nanocomposites used as the oil additive during sliding process. Moreover, this project can provide a new technique and the corresponding theory to produce a new nano-lubricating oil additive.