Ti3AlC2陶瓷的摩擦稳定性及其对载流磨损率的影响

Friction stability of Ti3AlC2 ceramic and its effect on current-carrying wear

研究了载流及不载流条件下Ti3AlC2陶瓷块体对低碳钢的滑动摩擦稳定性及其与载流磨损率的相关性。试验在盘．块式高速载流摩擦磨损试验机上进行，滑动速度为20-60m／s，法向压强为0．4-0．8MPa，载流强度为2A／mm^2。结果表明：不载流条件下滑动速度和法向压强的改变对摩擦的稳定性和Ti3AlC2块体的磨损率只有微弱的影响，而载流条件下有显著的影响；载流条件下，滑动速度越高或法向压强越小，摩擦的稳定性越低，磨损率越大，作为摩擦稳定性表征量的动摩擦系数标准偏差与载流磨损率之间存在强的线性相关性。但是，当滑动速度约大于50m／s或者法向压强约小于0．5MPa的情况下，Ti3AlC2块体的载流磨损率急剧增大。

The stability of the friction of a highly pure Ti3AlC2 bulk （with or without current-carrying） against the low carbon steel and its effect on the current-carrying wear were investigated. The experiments were performed on a block-on-disk type friction tester, with the sliding speed of 20- 60m/s, the normal pressure of 0.4- 0.8MPa and the current-carrying ability of 2A/mm^2. The results showed that the stability of friction and the wear rate of Ti3AlC2 were only slightly affected by the changes of the sliding speed and the normal pressure in the conditions of without current-carrying. However, a significant impact was caused under the current-carrying conditions. The stability of friction decreased with the increasing of the sliding speed or the decreasing of the normal pressure, with the higher stability corresponding to the lower wear rate under current-carrying friction. The standard deviation of the kinetic friction coefficient, as a characterization of stability, showed a strong linear correlation with the wear rate. However, when the sliding speed was higher than about 50m/s or the normal pressure was less than about 0.5MPa, the current-carrying wear rate of Ti3AlC2 increased rapidly.