電磨損性能的影響
(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 合肥 230009)
摘 要: 研究了壓力變化對碳納米管-銀-石墨復(fù)合材料純機(jī)械磨損和電磨損性能的影響。結(jié)果表明： 在純機(jī)械磨損條件下， 隨著壓力的增加， 復(fù)合材料的磨損體積線性增加； 在電磨損條件下， 復(fù)合材料的磨損體積與壓力成U型變化； 當(dāng)壓力過小時， 由于電氣磨損量大以及電刷跳動產(chǎn)生的火花磨損， 導(dǎo)致復(fù)合材料的電磨損體積較大； 當(dāng)壓力過大時， 破壞了電刷和換向器之間形成的潤滑膜，產(chǎn)生嚴(yán)重的犁削和粘著磨損， 使復(fù)合材料的電磨損體積急劇增大； 復(fù)合材料的電磨損體積與電刷的極性有關(guān)， 正刷的磨損體積大于負(fù)刷的磨損體積； 隨著壓力的增大， 復(fù)合材料的摩擦系數(shù)也隨之增大，且在相同條件下， 電磨損時的摩擦系數(shù)大于純機(jī)械磨損時的摩擦系數(shù)； 碳納米管的加入可以提高復(fù)合材料的抗電磨損性能。
關(guān)鍵字: 碳納米管-銀-石墨復(fù)合材料；機(jī)械磨損； 電摩擦磨損性能
（School of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China）
Abstract: The effect of pressure various on the mechanical and electrical wear properties of CNTs-Ag-G composites at 10 A/cm2 were studied. The results show that the wear volume loss of composites increases with the increase of pressure under mechanical wear, but the wear volume loss of composites varies with the change of pressure by U shape under electrical wear. When the pressure becomes smaller, the electrical wear volume loss of composites becomes larger because of the additional electrical and spark wear. When the pressure is bigger, the electrical wear volumes loss also becomes larger due to the discontinuous lubricating film, adhesion and ploughing. The wear volume loss of positive brush is more than that of negative brush. The friction coefficient of composites increases with the increase of pressure, and the friction coefficient of composites under electrical wear is greater than that under mechanical wear. Addition of CNTs-Ag-G can improve the electrical friction and wear properties of composites.
Key words: CNTs-Ag-G composite; mechanical wear; electrical friction and wear property
