Abstract: Muscovite and kaolin modified by oleic acid were prepared and used as additives for PTFE grease. The muscovite and kaolin before and after modification were characterized by IR. The volume resistivity, friction surface morphology and friction and wear properties of PTFE grease with muscovite or kaolin were measured by volume resistivity tester, scanning electron microscope (SEM) and current carrying reciprocating friction and wear tester. The results show that the friction reducing property of muscovite modified by oleic acid is the best, while the anti-wear property of kaolin modified by oleic acid is the best. Under the condition of current carrying, the oil modified kaolin additive has the best comprehensive properties of lubrication and insulation, and has the largest contact resistance.

Key words: oleic acid modification, muscovite, kaolin, current carrying tribological behaviors, grease, insulativity