硬脂酸钾固体润滑薄膜的制备及其摩擦磨损性能研究

Preparation and Tribological Behavior of Potassium Stearate Films

采用浸渍-提拉法制备出硬脂酸钾薄膜,用DF-PM型静-动摩擦磨损试验机和UMT-2MT型摩擦磨损试验机考察了在低速滑动和高速滑动条件下硬脂酸钾薄膜的摩擦磨损性能,采用扫描电子显微镜和X射线能量色散谱仪观察分析了薄膜及偶件磨损表面的形貌及其典型元素的面分布情况.结果表明,以GCr15钢球为偶件在高速滑动和以氮化硅球作为偶件在高、低速滑动条件下,薄膜具有较好的摩擦磨损性能.由于钢球和氮化硅陶瓷球表面粗糙度及其化学状态存在差异,硬脂酸钾更容易在氮化硅球表面形成转移膜,从而具有更低的摩擦系数和更长的耐磨寿命.

Potassium stearate films on hydroxyl silicon substrates were prepared by dip-coating. The tribological properties of the films sliding against AISI-52100 steel ball and Si3N4 ceramic ball were investigated with dynamic static friction coefficient measurement apparatus and universal micro-tribometer in ball-on-plate configuration. The morphologies of the wear tracks of the potassium stearate films and the counterparts were examined using a scanning electron microscope equipped with an energy-dispersive X-ray analyzer attachment. The potassium stearate films on the hydroxyl-terminated substrate showed better tribological properties under relative higher sliding velocity or sliding against Si3N4 ceramic ball. Because of the different chemical nature and larger surface roughness of steel ball and Si3N4 ball, transfer film of potassium stearate is more easily formed on ceramic ball, resulting in lower friction coefficient and longer wear life as compared to that of steel ball.