Friction and wear behavior of Al-CNT composites
Friction and wear behavior of Al-CNT composites
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DOI：
10.1016/j.wear.2013.08.021
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发表时间：
2013-09-30
期刊：
影响因子：
5
通讯作者：
Wifi, Abdalla
中科院分区：
文献类型：
--
作者：
Bastwros, Mina M. H.;Esawi, Amal M. K.;Wifi, Abdalla
铝(Al)-碳纳米管(CNT)复合材料在摩擦磨损领域具有广阔的应用前景。研究了均匀分散的碳纳米管含量高达5wt%的Al-CNT复合材料的磨损行为，并与冷压和热挤压相同工艺的纯铝进行了比较。研究了碳纳米管含量、滑动速度和载荷对复合材料磨损行为的影响。用扫描电子显微镜(SEM)对磨损表面的形貌进行了分析，发现随着碳纳米管含量的增加，材料的硬度和耐磨性显著提高。与纯铝相比，5wt%碳纳米管复合材料的磨损率降低了78.8%。伴随而来的是摩擦系数的下降。当碳纳米管含量为5wt%时，其磨损率和摩擦系数随滑动速度的增加而减小。磨损表面的扫描电子显微镜研究证实了碳纳米管在提高磨损性能方面起着主导作用。观察到碳纳米管被部分或全部粉碎，形成一层覆盖在表面的碳膜，起到固体润滑剂的作用，显着提高了磨损性能。(C)2013爱思唯尔B.V.保留所有权利。
Aluminum (Al)-carbon nanotube (CNT) composites are promising candidates for friction and wear applications. The wear behavior of Al-CNT composites, with up to 5 wt%, homogeneously dispersed CNTs, is investigated in the present study and compared to that of pure aluminum processed using the same technique of cold compaction and hot extrusion. The effects of CNT content, sliding speed and applied load, on the wear behavior of the composites were studied. The morphologies of the wear surfaces were investigated using scanning electron microscopy (SEM).Hardness and wear resistance were found to increase significantly with CNT content. The wear rate of the 5 wt% CNT composite decreased by 78.8% compared to pure aluminum. This was accompanied by a decrease in the coefficient of friction. For samples with 5 wt% CNT, the wear rate and coefficient of friction were found to decrease with increasing sliding speed. The SEM investigation of the worn surfaces confirmed the dominant role played by the CNTs in enhancing the wear characteristics. CNTs were observed to be either partially or fully crushed forming a carbon film that covered the surface and acted as a solid lubricant enhancing the wear behavior significantly. (C) 2013 Elsevier B.V. All rights reserved.