9胆固醇类离子液体作为空间油润滑轴承抗磨添加剂的性能研究#br#

本文合成了一种新型胆固醇类磷酸酯离子液体(记作［Col］［DBP］)，通过一系列结构及理化性能表征，发现该离子液体具有良好热稳定性，在合成烃类油(MAC)中具有优良的油溶性.然后利用真空球 盘摩擦试验机对比考察了［Col］［DBP］与另外两种油溶性离子液体(［P88816］［DOSS］与［P8888］［DEHP］)作为MAC添加剂对钢/PI、钢/PA两种摩擦副的润滑抗磨性能，结果表明：对于钢/PI摩擦副，三种油溶性离子液体均表现出显著的抗磨性能，其中［Col］［DBP］离子液体的抗磨性能最优，［P8888］［DEHP］离子液体的减摩效果最好；对于钢/PA摩擦副，三种油溶性离子液体作为MAC添加剂，均未起到显著的润滑抗磨作用.利用OM和SEM对磨损表面进行分析表征，发现三种离子液体均能明显改善MAC润滑条件下摩擦副的犁沟效应，获得较为光滑平整的磨损表面.

Lubrication Performance of Several Oil Soluble Ionic Liquids#br# for Bearings in Space Environment#br#

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.