【摘 要】
：
Carbon nanotubes (CNTs) were coated by tungsten using metal organic chemical vapor deposition.Magnetic stirring was employed to disperse the W-coated CNTs (W-CN
【机 构】
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School of Materials Science and Engineering,China Iron & Steel Research Institute Group
论文部分内容阅读
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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