锂盐型电力复合脂的导电性和摩擦学性能

Electrical Conductivities and Tribological Properties of Lithium Salts Conductive Grease

以三种锂盐:四氟硼酸锂(LiBF4)、六氟磷酸锂(LiPF6)和双三氟甲烷磺酰亚胺锂(LiNTf2)作为锂基润滑脂导电剂制得了三种电力复合脂。分别采用DDSJ-308A型电导率仪,GEST-121型体积表面电阻率测试仪和HLY-200A型回路电阻测试仪对电力复合脂的导电性进行了测试。并采用Optimol SRV-I型振荡往复摩擦磨损试验机对电力复合脂在室温下的摩擦学性能进行了测试。结果表明,三种锂盐可以提高润滑脂的导电性,还可以改善润滑脂的摩擦学性能。利用Micro-XAM3D轮廓扫描仪测量了磨痕体积,采用扫描电子显微镜和PHI-5702型多功能X射线光电子能谱仪对磨损表面进行了表征和分析。分析结果表明,在摩擦过程中形成了包含吸附膜和化学反应膜的边界膜,使得减摩抗磨性能得到了改善。

Three kinds of conductive grease are prepared by adding three lithium salts, including lithium tetrafluoroborate （LiBF4）, lithium hexafluorophosphate （LiPF6） and lithium bis （trifluoromethane sulfonamide） （LiNTf2） in lithium grease. The electrical conductive properties of the prepared conductive greases are evaluated by using a DDSJ-308A conductivity meter, a GEST-121 volume surface resistance tester and a HLY-200A circuit resistance tester, respectively. And the tribological behaviors of three kinds of lithium salts are investigated by an Optimol SRV-I oscillating reciprocating friction and wear tester at room temperature （RT）. The results demonstrate that the addition of lithium salts can enhance the lithium grease conductivity and also dramatically improve the tribological properties of lithium grease, the wear volumes are valued by Micro-XAM3D noncontact surface mapping profiler, wear surface are characterized and analyzed based on scanning electron microscope （SEM） and PHI-5702 multifunctional X-ray photoelectron spectrometer （XPS）. The results indicate the improvement of tribological properties should attribute to the formation of boundaryfilm consisting of both absorptionfilm and chemical reactionfilm.