Fabrication and thermal conductivity of copper matrix composites reinforced by tungsten-coated carbon nanotubes |
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Authors: | Jun-hui Nie Cheng-chang Jia Xian Jia Yi Li Ya-feng Zhang Xue-bing Liang |
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Institution: | 1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,China;2.China Iron & Steel Research Institute Group,Beijing,China |
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Abstract: | Carbon nanotubes (CNTs) were coated by tungsten using metal organic chemical vapor deposition. Magnetic stirring was employed
to disperse the W-coated CNTs (W-CNTs) in a Cu matrix, and then, the mixed powders were consolidated by spark plasma sintering.
The W-CNTs obtained a uniform dispersion within the Cu matrix when the W-CNT content was less than 5.0vol%, but high content
of W-CNTs (10vol%) resulted in the presence of clusters. The W-CNT/Cu composites containing low content of W-CNTs (<5.0vol%)
exhibited a higher thermal conductivity than the sintered pure Cu, while the CNT/Cu composites exhibited no increase in thermal
conductivity after the incorporation of uncoated CNTs. The W-CNT content was found to play a crucial role in determining the
thermal conductivity of the W-CNT/Cu composites. The thermal conductivity of the W-CNT/Cu composites increased first and then
decreased with the W-CNT content increasing. When the W-CNT content was 2.5vol%, the W-CNT/Cu composite obtained the maximum
value of thermal conductivity. The thermal resistance of the (W-CNT)-Cu interface was predicted in terms of Maxwell-Garnett
effective medium approximation, and its calculated value was about 3.0×10−9 m2·K·W−1. |
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