Tribological studies on microwave sintered copper-carbon nanotube composites
Tribological studies on microwave sintered copper-carbon nanotube composites
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DOI：
10.1016/j.wear.2011.01.017
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发表时间：
2011-04-04
期刊：
影响因子：
5
通讯作者：
Aravindan, S.
中科院分区：
文献类型：
--
作者：
Rajkumar, K.;Aravindan, S.
采用化学两步敏化活化法制备多壁碳纳米管，以提高金属基体的界面强度。将包铜碳纳米管（5- 20vol .%）与铜金属粉混合，微波加热烧结。对复合材料进行了销盘试验，研究了复合材料的摩擦学特性。它们的机械和摩擦学性能与传统的和火花等离子烧结的材料相当。由于碳纳米管的团聚，性能的改善仅限于15 vol.%。与未增强的铜相比，复合材料具有更低的摩擦系数和更低的磨损率，这是因为在接触表面形成了碳质膜。碳纳米管的自润滑作用减少了摩擦加热。低碳纳米管浓度下的磨损机制为塑性变形，高浓度下的磨损机制为片状/剥落。(C) 2011 Elsevier B.V.版权所有
Multiwall carbon nanotubes were coated with copper using an electroless two-step sensitization-activation method in order to improve the interfacial strength of the metal matrix. Copper-coated carbon nanotubes (5-20 vol.%) were mixed with copper metal powder and microwave heating was used to sinter them. The composites were subjected to pin-on-disc testing to study their tribological characteristics. Their mechanical and tribological properties were comparable to those of conventional and spark plasma sintered ones. The improvement in properties was limited to 15 vol.% due to the agglomeration of carbon nanotubes. The composites exhibited a lower coefficient of friction and a lower wear rate compared to unreinforced copper, because of the formation of a carbonaceous film at the contact surface. The self lubricating effect of carbon nanotubes reduces the frictional heating. The wear mechanism for low carbon nanotube concentrations was plastic deformation, whereas at high concentrations it was flake formation/spalling. (C) 2011 Elsevier B.V. All rights reserved.