界面摩擦过程热力耦合行为实验研究

Experimental Research on the Thermo-dynamic Coupling Behavior on Contact Surface Friction

利用原子力显微镜,分别以硅片、石英及云母作为实验样本,测试不同载荷和不同滑动速度下的摩擦力变化,探讨界面摩擦过程中各参数对系统摩擦学性能的影响规律。实验表明:摩擦力随载荷的增加而增大,而不同材料的摩擦力随载荷增加而增大的趋势不一致,界面摩擦过程中的摩擦学行为与材料的微观结构密切相关。缓慢滑动时,滑动摩擦系数随相对滑动速度的增加而增大;当滑动速度超过某一区域后,其滑动摩擦系数随相对滑动速度的增加而减小。

Using silicon,quartz and mica as experimental samples,the changing of friction force were tested by atomic force microscope（AFM）.The experimental results show that the load-friction force curves are different for silicon chip,quartz and mica.This means that the tribology behaviors have close relation with the microscopic structure of the material during the contact surface friction.The friction force increases with the increase of the load;the sliding friction coefficient increases with the increase of the relative sliding velocity when the sliding velocity is slow,but decreases slowly with the increase of the velocity when the sliding velocity is greater than a certain value.