离子液体在润滑脂中的导电性和摩擦学性能研究

Conductivity and Tribological Performances of Ionic Liquid as Base Oil of Greases

以聚亚烷基二醇(PAG)为基础油,LiBF_4和LiNTf_2锂盐为添加剂原位形成离子液体;制备以离子液体为基础油,以高碱值复合磺酸钙为稠化剂的导电润滑脂,考察其体积电阻率、接触电阻等导电性,在MFT-R4000高速往复摩擦磨损试验机上评定其摩擦学性能,并采用超高分辨率场发射扫描电子显微镜进行表面分析。结果表明:LiBF_4和LiNTf_2可显著提高高碱值复合磺酸钙基脂的导电性,且LiBF_4比LiNTf_2导电效果更好;在摩擦过程中LiBF_4能在摩擦副之间形成摩擦保护膜,因而其具有优异的减摩抗磨作用;含质量分数2%LiBF_4的高碱值复合磺酸钙基导电润滑脂,其导电性和摩擦学性能明显优于商用电力复合脂,可作为新型电力复合脂使用。

Overbased calcium sulfonate electrical joint complex grease were prepared using polyalkylene glycol ( PAG) and LiBF4 , LiNTf2 in situ formed ionic liquids as base oil. The volume resistivity and contact resistance for the electrical joint complex grease were investigated. Its tribological properties were evaluated by a MFT?R4000 high?speed reciprocating friction and wear tester, and the worn scar surface was analyzed by high resolution field emission scanning electron micro?scope. The results show that LiBF4 and LiNTf2 can significantly improve the conductivity of the grease, and the conductivi?ty of LiBF4 is better than that of LiNTf2.During the friction process, LiBF4 can form friction protection film on the friction surface, so it possesses better friction reducing and wear resistance. When the weight of additive LiBF4 is 2%, the per?formance of the prepared grease is obviously better than that of commercially electrical joint compounded grease,it can be used as a novel electrical joint compounded grease.