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Processing of copper-carbon nanotube composites by vacuum hot pressing technique

机译:真空热压工艺加工铜碳纳米管复合材料

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摘要

Copper (Cu) matrix composites reinforced with 0.2, 5 and 10vol% single wall carbon nanotubes (SWCNT) and 5 and 10vol% multi-wall carbon nanotubes (MWCNT) were processed by high energy milling of pure copper powder with carbon nanotubes (CNTs) and subsequent consolidation by vacuum hot pressing. Microstructural observations of the sintered composites revealed equiaxed twinned microstructure for 0.2 vol% SWCNT composite and elongated grain structure, with CNT layers in between, in composites having higher CNTs content. The porosity in the composites was associated with CNT layers. The distribution of CNTs was found to be different in axial and transverse directions. Significant improvement in hardness of Cu-SWCNT composite was observed with increase in CNTs content. Whereas, in case of MWCNT composite, hardness reduced for 10vol% CNT composites. Compression strength of the SWCNT samples was found to be higher than the MWCNT reinforced samples.
机译:通过高能研磨纯铜粉与碳纳米管(CNT)来加工由0.2、5%和10%(体积)的单壁碳纳米管(SWCNT)和5%和10%(体积)的多壁碳纳米管(MWCNT)增强的铜(Cu)基复合材料然后通过真空热压进行固结。烧结复合材料的微观结构观察表明,在具有较高CNTs含量的复合材料中,存在0.2体积%SWCNT复合材料的等轴孪晶微观结构和细长的晶粒结构,且在其间存在CNT层。复合材料中的孔隙率与CNT层有关。发现CNT在轴向和横向上的分布是不同的。随着CNT含量的增加,观察到Cu-SWCNT复合材料的硬度显着提高。而对于MWCNT复合材料,硬度降低了10vol%。发现SWCNT样品的抗压强度高于MWCNT增强样品。

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