Electrodeposition of nickel-carbon nanotube nanocomposite coatings for enhanced wear resistance
Electrodeposition of nickel-carbon nanotube nanocomposite coatings for enhanced wear resistance
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DOI：
10.1016/j.wear.2011.01.068
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发表时间：
2011-07-29
期刊：
影响因子：
5
通讯作者：
Zhu, Y.
中科院分区：
文献类型：
--
作者：
Carpenter, C. R.;Shipway, P. H.;Zhu, Y.
在过去的40年里，由金属基体中的硬质或润滑性微米级增强颗粒组成的复合电沉积涂层在许多高耐磨性和低摩擦应用中得到了商业应用。近年来，已经证明这一过程可以扩展到纳米级，使用高性能的纳米级增强颗粒，提供了许多优点，证明了它们更高的成本。在这项研究中，镍-碳纳米管(Ni-CNT)复合镀层通过电沉积的方法从含有未改性和酸处理(功能化)的碳纳米管的Watts电解液中制备。与未改性碳纳米管制备的镍碳纳米管涂层相比，使用功能化碳纳米管制备的镍碳纳米管涂层的均匀性显著提高，并且具有更高和更稳定的硬度。Ni-CNT涂层(由功能化碳纳米管制成)和纯镍涂层随后在往复干燥条件下进行了在一定载荷和碳纳米管体积分数范围内的磨损试验。利用轮廓仪和扫描电子显微镜研究了碳纳米管对镍基复合材料磨损性能的影响。结果表明，碳纳米管显著提高了电沉积镍的耐磨性，磨损率仅为未强化电沉积的1/3。纯镍涂层没有形成转移膜，而Ni-CNT涂层形成了结合良好的氧化层，这表明碳纳米管本身促进了附着的氧化物转移层的形成。(C)2011爱思唯尔B.V.保留所有权利。
Composite electrodeposited coatings consisting of hard or lubricous micron sized reinforcement particles within a metal matrix have been used commercially in a number of high wear resistance and low friction applications over the last 40 years. In recent years, it has been demonstrated that this process may be extended into the nanoscale regime, using high performance nanoscale reinforcement particles which offer a number of advantages that justify their higher cost. In this study, nickel-carbon nanotube (Ni-CNT) composite coatings were prepared by electrodeposition from a Watts electrolyte containing both unmodified and acid treated (functionalised) CNTs. The Ni-CNT coatings fabricated using functionalised CNTs exhibited significantly improved homogeneity compared to the coatings fabricated from unmodified CNTs, as well as higher and more consistent hardness. Both Ni-CNT coatings (fabricated from functionalised CNTs) and pure nickel coatings were then subjected to wear testing in reciprocating dry conditions over a range of loads and CNT volume fractions. The influence of CNTs on the wear properties of the nickel matrix was assessed using profilometry and SEM. It was found that CNTs substantially improved the wear resistance of the electrodeposited nickel, reducing wear rate to as little as a third of that of the unreinforced electrodeposit. The pure nickel coatings exhibited no transfer film formation, whereas the Ni-CNT coatings exhibited an oxide layer which was well adhered; it is proposed that the CNTs themselves promote the development of the adhered oxide transfer layer. (C) 2011 Elsevier B.V. All rights reserved.