滑动速度对CNTs-Ag-MoS_2-C_(graphite)复合材料电磨损性能的影响  

Effects of Sliding Velocity on Electrical Wear Performance of CNTs-Ag-MoS_2-C_(graphite) Composites

作　　者：李庶[1] 凤仪[1] 陈淑娴[1] 

机构地区：[1]合肥工业大学,合肥230009

出　　处：《中国机械工程》2009年第10期1230-1234,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50741003);教育部科学技术研究重点项目(107066);安徽省自然科学基金资助项目(070414181);安徽省教育厅重大科研项目(ZD2008003)

摘　　要：采用粉末冶金方法制备了CNTs-Ag-MoS2-Cgraphite复合材料,研究了滑动速度变化对复合材料在带电状态下摩擦磨损性能的影响。实验结果表明:在电摩擦磨损过程中,随着滑动速度的增大,滑环所黏着的气流厚度增大,使得电刷与滑环接触表面间隙加大,材料表面的接触电阻增大,电压降也随之增大,而摩擦因数呈线性下降趋势;电流作用产生的超温现象,加速了摩擦表面的磨损,带电磨损时的磨损率大于纯机械磨损时的磨损率且随速度增大先降低后提高;材料转移现象及电流化学作用导致正刷的磨损率大于负刷的磨损率。CNTs--Ag--MoS2--Cgraphite composites were produced by means of powder metallurgy. The effect of sliding velocity changes on electrical friction and wear performance was studied. The ex- perimental results show that, with the increase of sliding velocity, both of the contact resistance and the contact voltage increase because of the increase of the gap caused by the adhesive gas flow between the brush and the slipping ring. The friction coefficient decreases linearly with the increase of sliding velocity. In the same process, the electrical wear rate which decreases firstly before increasing, is larger than that of the pure mechanical wear rate due to the excess temperature on the micro frictional surfaces caused by current. The wear rate of the positive brush is larger than that of the negative brush due to the material transformation and the chemical actions under the electrical current.

关 键 词：电接触 接触电压降 摩擦因数 磨损率 

分 类 号：TH117.3[机械工程—机械设计及理论] TB333[一般工业技术—材料科学与工程]