关键词: 油溶性, 离子液体, 润滑添加剂, 空间轴承

Abstract:  A new cholesterol based phosphate ionic liquid (［Col］［DBP］) is firstly synthesized. This ionic liquid is characterized by structural and physicochemical property analyses. The results indicate that ［Col］［DBP］ possesses high thermal stability and can be soluble in synthetic hydrocarbon oil (MAC). By comparison ［Col］［DBP］ with two oil soluble ionic liquids ［P88816］［DOSS］ and ［P8888］［DEHP］, the tribological properties of three ionic liquids as additives in MAC on two tribopairs (steel/PI and steel/PA) are investigated on vacuum ballondisc friction tester. The results indicate that three oil soluble ionic liquids exhibit excellent antiwear performances on steel/PI contact. What’s more, ［Col］［DBP］ shows the best antiwear property and ［P8888］［DEHP］ shows the best frictionreducing performance in this contact. For steel/PA contact, three ionic liquids as additives in MAC can not effectively reduce the friction and wear of MAC base oil. The worn surfaces are characterized by OM and three ionic liquids in MAC base oil and further the smoother worn surfaces are generated.