Nickel-Coated Super-Aligned Carbon Nanotube Reinforced Copper Composite for Improved Strength and Conductivity
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JMEPEG (2019) 28:4393–4402 https://doi.org/10.1007/s11665-019-04190-0
Nickel-Coated Super-Aligned Carbon Nanotube Reinforced Copper Composite for Improved Strength and Conductivity Jing Shuai, Lunqiao Xiong, Zecheng Hou, Lin Zhu, and Wenzhen Li (Submitted September 4, 2018; published online July 3, 2019) Nickel (Ni)-coated super-aligned carbon nanotube (SACNT) films-reinforced copper (Cu) matrix composites were fabricated by electrodeposition. The microstructure, mechanical property and electrical conductivity of the prepared composites have been studied systematically. The results show that the mechanical properties of SACNT/Cu were significantly improved by coating SACNT with Ni. When the volume fraction of SACNT is 10.0%, the tensile strength and yield strength of the composite can reach 477.8 and 295.5 MPa, respectively, corresponding to 147 and 170% improvement compared to pure Cu prepared by the same method. Meanwhile, due to the super-aligned arrangement of SACNTs and the homogeneous distribution of Ni, which is not mixing or dissolving with Cu, the conductivities of all the Ni-coated SACNTreinforced Cu composites are above 58% IACS, which is about 4 times higher than the results in previous research. The enhancement of the strength of the SACNT/Cu composites comes from the combined contribution of load transfer and grain refinement strengthening. Keywords
copper matrix composite, interface, microstructure, properties, super-aligned carbon nanotubes
1. Introduction Pure Cu plays an important role in the field of electronic industry because of its excellent electrical and thermal conductivities. However, its low strength and ampacity limit its application in high-power chips and miniaturized electronic equipment. Therefore, improving the mechanical strength and current-carrying capacity of Cu while keeping its high electrical and thermal conductivity is of great significance in expanding its application scope. To achieve excellent comprehensive properties, ‘‘composite method,’’ which produces a new material from two or more constituent materials with significantly different physical or chemical properties, has received a great deal of attention. There are lots of researches about Cu matrix composites with various reinforcements, among which, the carbon nanotubes (CNTs) have held a higher appeal due to their unique atomic structure and fascinating properties (Ref 1-5). However, there are two main difficulties during the preparation of CNTs/Cu composites, one is how to make CNTs homogeneously dispersed in Cu matrix, and the other is how to obtain strong Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11665-019-04190-0) contains supplementary material, which is available to authorized users. Jing Shuai, Lunqiao Xiong, Zecheng Hou, and Wenzhen Li, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; and Lin Zhu, Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China. Contact e-mail: zqqlwz@tsinghua.
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