离子液体添加剂对硬脂酸钾固体润滑薄膜摩擦磨损性能的影响

采用浸渍-提拉方法在单晶硅片上制备硬脂酸钾以及添加离子液体的硬脂酸钾复合薄膜,采用DF-PM型静-动摩擦磨损试验机考察薄膜在低速滑动条件下的摩擦磨损性能,采用扫描电子显微镜和X射线能量散射谱仪观察分析薄膜及其偶件表面的磨损形貌及典型元素面分布.结果表明:在相对低速滑动条件下,在羟基化硅基底上制备的复合薄膜的摩擦磨损性能优于硬脂酸钾薄膜;在载荷为1.0 N条件下,含离子液体质量分数40.0%的复合薄膜的耐磨寿命超过5 000次,而硬脂酸钾薄膜仅为100次左右;随着复合薄膜中离子液体含量增加,复合薄膜更容易在偶件钢球表面形成有效转移薄膜,使复合薄膜摩擦磨损性能得以提高.

Effect of Ionic Liquid as Additive on the Tribological Performance of Potassium Stearate Films

Potassium stearate films doped with ionic liquid were prepared by dip-coating on hydroxyl silicon substrates. The tribological property of the composite films sliding against AISI-52100 steel ball was investigated with dynamic static friction coefficient measurement apparatus in ball-on-plate configuration. The morphologies of the wear tracks of the various films and the counterparts were examined using a scanning electron microscope equipped with an energy-dispersive X-ray analyzer attachment. It was found that the composite films on the hydroxyl-terminated silicon substrate showed better tribological properties than potassium stearate films under relative lower sliding velocity. At the load of 1.0 N, the composite potassium steartate film containing 40.0% wt ionic liquid slid 5 000 cycles without failure, while the pure potassium stearate film only lasted 100 cycles. Transfer film was more easily formed on the counterpart steel ball with increasing the concentration of ionic liquid in the composite film. As a resuit, the tribological performance of the composite film was improved.