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Vol.51, No.10, 773 ~ 781, 2013
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| Title |
| Fabrication of Cu/CNT Nanocomposite Powders by Metal Displacement Reaction |
| 최경환 Kyeong Hwan Choe , 장훈 Hoon Jang , 임정규 Jung Kyu Lim , 김상섭 Sang Sub Kim , 조규섭 Gue Serb Cho |
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| Abstract |
| Carbon nanotubes (CNTs) have recently emerged as a reinforcement for metal matrix composites (MMCs), but the problem of dispersion of CNTs and the interface between the metal matrix (MM) and CNTs makes it difficult to utilize MM-CNTs composites. In this study, in order to decrease the floatation and clustering of CNTs and improve the wettability between CNTs and an Al melt, CNTs were decorated with Cu particles by a metal displacement reaction. To investigate the effects of their morphology on the metal displacement reaction, flake-and spherical-type Zn powders were respectively added to precipitate Cu particles in a Cu salt solution. The flake-type Zn powders were fully displaced by Cu in the solution, but in case of the spherical-type Zn powders, Cu was deposited on the surface only. The reaction temperature did not affect the characteristics of the metal displacement reaction. This result was attributed to the fact that the rate of the metal displacement reaction was decreased in ethanol due to an increase in viscosity in diffusion of Cu2+ from the solution to the metallic Zn surface. Cu/CNTs nanocomposite powders were manufactured by the addition of copper chloride (CuCl2) to an ethanol suspension containing pre-treated CNTs. The CNTs were mixed with precipitated Cu nanoparticles and others were entrapped between the Cu particles or agglomerates. It was attributed to the lack of the active sites on the CNTs surface for the nucleation of Cu crystal. (Received November 1, 2012) |
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| Key Words |
| Composites, metal displacement reaction, inferfaces, scanning electron microscopy, carbon nanotube |
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