Abstract Demanding for high thermal and electrical conductive copper-based composites for structural, electrical and thermal applications are being indispensable. In this work, a method is proposed to improve the electrical and thermal conductivity of multi-walled carbon nanotubes/copper (MWCNTs/Cu) composites by applying the annealing process. The effect of annealing temperatures on the electrical and thermal properties of MWCNTs/Cu composite containing 0.5 vol% MWCNTs prepared by conventional sintering followed by cold rolling was investigated. The experimental results indicated that as increasing annealing temperature, the electrical and thermal conductivity increased due to the recovery, the recrystallization and the grain growth of the Cu matrix. The electrical and thermal conductivity of cold rolled MWCNTs/Cu composite annealed at 500 °C are improved up to 9% and 19% respectively compared to the composite without annealing. The coefficient of thermal expansion (CTE) of the MWCNTs/Cu composite is 8% lower compared to the pure Cu attributed to uniform dispersed MWCNTs, low coefficient of thermal expansion of MWCNTs, good bonding between CNTs and the matrix.

中文翻译：

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退火温度对冷轧多壁碳纳米管增强铜复合材料电热性能的影响

摘要 对用于结构、电气和热应用的高导热和导电铜基复合材料的需求是必不可少的。在这项工作中，提出了一种通过应用退火工艺来提高多壁碳纳米管/铜 (MWCNTs/Cu) 复合材料的导电性和导热性的方法。研究了退火温度对通过常规烧结然后冷轧制备的含有 0.5 vol% MWCNTs 的 MWCNTs/Cu 复合材料的电学和热学性能的影响。实验结果表明，随着退火温度的升高，由于Cu基体的恢复、再结晶和晶粒长大，电导率和热导率增加。与未退火的复合材料相比，在 500°C 下退火的冷轧 MWCNTs/Cu 复合材料的电导率和热导率分别提高了 9% 和 19%。MWCNTs/Cu 复合材料的热膨胀系数 (CTE) 比纯 Cu 低 8%，这归因于均匀分散的 MWCNTs、MWCNTs 的低热膨胀系数、CNTs 与基体之间的良好结合。