六方氮化硼负载纳米铜润滑添加剂的制备及其摩擦学性能研究

采用水热吸附及热解还原制备六方氮化硼负载纳米铜复合润滑添加剂(Cu/h-BN),利用透射电镜(TEM)、X射线衍射仪(XRD)、热重分析仪(TGA)以及红外光谱仪(FT-IR)对样品进行表征。将纳米润滑添加剂分散到聚α-烯烃(PAO10)中，采用球盘摩擦试验考察其摩擦学性能。采用扫描电子显微镜(SEM)对典型的磨痕进行形貌分析，采用X射线光电子能谱技术(XPS)对沉积的润滑膜表面的化学成分和价态进行分析，探讨复合润滑添加剂在摩擦过程中的润滑机制。结果表明：相比于六方氮化硼分散的油样，复合润滑添加剂Cu/h-BN中氮化硼在摩擦界面的层间滑移以及纳米铜粒子在磨痕界面的修复作用，使得PAO10基础油表现出更为优异的摩擦学性能，摩擦因数和磨损率分别降低了15.4%和29.7%。复合润滑添加剂Cu/h-BN中Cu和h-BN能发挥各自的结构优势，加速固体润滑膜的形成，从而实现优异的摩擦学性能。

Preparation and Tribological Properties of h-BN Dotted with Cu Nanoparticles as Lubricant Additive

Hexagonal boron nitride dotted with copper nanoparticles as lubricating additive(Cu/h-BN)was prepared by hydrothermal adsorption and pyrolysis reduction.The as-prepared lubricating additives were characterized by transmission electron microscopy(TEM),X-ray diffccraction(XRD),thermo gravimetric analysis(TGA)and infrared spectroscopy(FT-IR).Lubricating additive was dispersed into polyα-olefin(PAO10)and the tribological properties were investigated by ball-on-disk tribo-test.SEM was used to analyze the morphology of typical wear marks,and XPS was used to analyze the chemical composition and chemical state of the deposited lubricating film,and the anti-wear mechanism of the composite lubricating additive was discussed.The results show that compared with the oil sample dispersed by hexagonal boron nitride,the interlayer slip of boron nitride at the friction interface and the repair of copper nanoparticles at the abrasion interface in the composite lubricating additive of Cu/h-BN make the PAO10 base oil exhibit better tribological properties,and the friction coefficient and wear rate are reduced by 15.4%and 29.7%,respectively.Cu and h-BN in the composite lubricating additives of Cu/h-BN can play their respective structural advantages and accelerate the formation of solid lubricating film,so as to achieve excellent tribological properties.