Frictional performance of mixed metal soap greases

润滑脂在边界润滑条件下的摩擦磨损特性主要受金属皂的种类和增稠剂的纤维结构控制。采用球盘式摩擦磨损试验机考察了硬脂酸锂基润滑脂和含不同金属的12-羟基硬脂酸锂基润滑脂在滑动接触条件下的摩擦特性。在20~150℃条件下，硬脂酸锂基润滑脂与铁、铜、铝基皂混合后的摩擦性能优于其本身。硬脂酸锂基润滑脂与硬脂酸金属脂混合后的摩擦性能优于硬脂酸锂基润滑脂与12-羟基硬脂酸锂基润滑脂的摩擦性能。混合硬脂酸锂基润滑脂的摩擦性能优于12-羟基硬脂酸锂基润滑脂，羟基提高了锂基皂基润滑脂的耐热性和耐水解性。然而，羟基增加了摩擦力。铜皂表现出与12-羟基硬脂酸锂类似的性能。溶解于正己烷的铝皂润滑脂在120℃以上的摩擦条件下表现出较弱的纤维性能。

The friction and wear characteristics of greases under boundary lubricating condition are mainly controlled by the kind of metal soap and fiber structure of thickener. In this study, the frictional characteristics of lithium stearate grease and lithium 12-hydroxystearate grease containing different metal; iron, copper and aluminum soaps were investigated in sliding contact using a ball on disk type tester.Lithium soap grease mixed with iron, cupper or aluminum soap was superior in frictional performance to itself from 20C to 150C condition. Lithium stearate greases mixed with metal stearate greases were superior in frictional performance to lithium stearate greases with metal 12-hydroxystearate greases. Mixed lithium stearate greases were superior in frictional performance to mixed 12-hydroxystearate greases.Hydroxyl improves heat and hydrolysis resistance of lithium soap grease. However, hydroxyl increases the friction. Cupper soap shows similar performance of lithium 12-hydroxystearate. Aluminum soap grease resolved into hexane shows weak fiber performance in friction over 120 C conditions.