Characterization of Carbon Nanotubes/Cu Nanocomposites Processed by Using Nano-sized Cu Powders
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Characterization of Carbon Nanotubes/Cu Nanocomposites Processed by Using Nano-sized Cu Powders Kyung Tae Kim, Kyong Ho Lee, Seung Il Cha, Chan-Bin Mo and Soon Hyung Hong Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea Address all correspondence to this author Email: [email protected] ABSTRACT Carbon nanotubes (CNTs) have attracted remarkable attention as reinforcement for composites owing to their outstanding properties1-3. CNT/Cu nanocomposites were fabricated by mixing the nano-sized Cu powders with multi-wall carbon nanotubes and followed by the spark plasma sintering process. The CNT/Cu nanocomposite fabricated from nano-sized Cu powders shows more homogeneous distribution of CNTs in matrix compared to that fabricated from macro-sized Cu powders. The hardness of CNT/Cu nanocomposite fabricated from nano-sized Cu powders increases with increasing the volume fraction of CNTs, while the hardness of that fabricated from macro-sized Cu powders decreases with the addition of CNTs.
INTRODUCTION Carbon nanotube (CNT) has been considered as an ideal reinforcement for composite materials due to its outstanding properties such as high strength, elastic modulus, aspect ratio and conductivities. In CNT/polymer nanocomposite, the addition of carbon nanotube as reinforcement in polymer matrix improves the strength of matrix by several times4,5. However, compared to CNT/polymer nanocomposites, the CNT/metal and CNT/ceramic nanocomposites attract less attention due to their lower mechanical properties than expected. Even though several researchers have fabricated CNTs/metal composite by powder metallurgy process including mixing of CNTs with metal powders and followed by hot pressing5-8, the CNTs/metal nanocomposites show low relative density ranged 85~95% and, at the same time, the CNTs are severely agglomerated in matrix. As a result, the addition of carbon nanotubes have not been successful to enhance the mechanical properties of matrix materials. In previous researches on CNT/metal nanocomposites, there are two critical problems remained to be solved to produce sound CNT/metal nanocomposites. One is the homogeneous dispersion of CNTs in matrix with avoiding the agglomeration of CNTs. The other is the higher densification of CNT/metal nanocomposite
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during the consolidation process. Concerning to the homogeneous dispersion of CNTs and matrix, Peigney and Flahaut9,10 introduced CNT reinforced composites synthesized by the in-situ growth of CNTs in Fe-Al2O3 powders. Recently, Mukherjee et al.11 use nano-size Al2O3 powders for CNT/Al2O3 nanocomposites, and H. Cong et al.12 used nano-sized Al powders to fabricate CNT/Al nanocomposites in order to distribute the carbon nanotubes more homogeneously. However, the mechanical properties were not enhanced as expected due to the low density after sintering process.
EXPERIMENTAL PROCEDURES In this study, CNT/Cu nancomposites were fabricated by powder metallur
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