表面修饰氟化镧微粉的制备及极压性能研究

以硝酸镧、氟化氨等为原料，经溶液反应及适当的修饰工艺制备了表面修饰氟化镧微粉。将所制备的微粉作为极压抗磨剂，以四球实验测试了氟化镧微粉的最大无卡咬负荷（pB）及磨痕直径（D）。结果表明，经表面修饰的氟化镧微粉具有较好的极压抗磨性能，其极压性能优于目前普遍使用的极压抗磨剂二烷基二硫代磷酸锌ZnDDP。以扫描电子显微镜（SEM）、X射线光电子能谱（XPS）观察和分析了蚀球磨痕形貌及磨痕表面的化学成分，在摩擦过程中氟化镧微粉与摩擦副表面发生摩擦化学反应，生成了由氧化镧、氧化铁等组成的边界润滑膜，是此类极压抗磨剂具有较好的极压性能的主要原因。

Preparation of surface modified lanthanum trifluoride power and investigation of lts anti-wear property at extremepressure

Lanthanum trifluoride A kind of surface-modified micro-powder, was prepared usiug the reaction of solution and a proper modificatiou technique. With the powder used as an anti-wear additive at extreme-pressure, the value of p B and diameter (D) of wear scar were established through four-ball experiments, which indicate that lanthanum trifluoride has better anti-wear properties at extreme-pressure and better lubricating ability than ZnDDP (Zinc dialkyldithiophophate) readily available on market at present. The rubbing surface of the balls used for experiments were analysed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) for microstrcture and chemical composition. The lanthanum trioxide and iron oxides etc.In the friction surface are main cause for the good anti-wear properties of LaF 3.