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采用萃取法制备了油酸修饰的纳米CaF2,用X射线衍射(XRD)对纳米CaF2粉体样品进行物相分析,同时用透射电子显微镜(TEM)及傅立叶变换红外光谱仪(FT-IR)进行表面形貌和成分分析,并在四球摩擦磨损试验机上评价了CaF2在润滑脂中的摩擦学性能.结果表明,制备的纳米CaF2粒径在23 nm左右,油酸以化学吸附的方式吸附在CaF2纳米核表面;作为添加剂油酸修饰纳米CaF2在润滑脂中具有良好的抗磨性能和极压性能,在高载荷时具有良好的减摩性能.SEM,EDS和XPS分析表明在摩擦过程中形成了由CaF2、CaO、氧化铁和有机添加剂所组成的边界润滑膜,从而使OA-CaF2具有良好的摩擦学性能.
The oleic acid-modified nano-CaF2 was prepared by the extraction method. The phase analysis of the nano-CaF2 powder was carried out by X-ray diffraction (XRD). The surface of the nano CaF2 powder was characterized by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) Morphology and composition analysis, and tribological properties of CaF2 in grease were evaluated on a four-ball friction and wear tester.The results show that the particle size of prepared nano-CaF2 is about 23 nm, and oleic acid is chemically adsorbed on the surface of CaF2 nano As the additive oleic acid modified nano-CaF2 has good wear resistance and extreme pressure performance in grease, and has good anti-friction properties under high load.SEM, EDS and XPS analysis show that the formation of CaF2, CaO, iron oxide and organic additives consisting of the boundary lubrication film, so that OA-CaF2 has good tribological properties.