【摘要】 基于电工材料高电导、高强度的发展需求,本工作通过粉末真空热压烧结成功制备出微量Cr元素掺杂的功能化碳纳米管增强铜基复合材料（CuCr/CNTs）,系统研究了热压烧结及轧制工艺对复合材料电导率和力学性能的影响。研究发现,在烧结温度为900℃、保温1 h、保压压力为50MPa的工艺下,样品的电导率高达96.2%IACS,硬度为73.0HV。通过对微观组织与性能的分析,发现热压烧结工艺显著影响基体晶粒的尺寸以及界面处碳化物的数量,界面处适量Cr₃C₂纳米相的存在可以改善界面润湿性,增强界面结合,有利于电流传递和载荷传递。通过进一步冷轧,CNTs定向排列并均匀分散,样品的电导率和力学性能均有提升,在电导率保持96.6%IACS时,其屈服强度可达311 MPa,拉伸强度达到373 MPa,具有非常好的工程应用前景。更多还原

【Abstract】 Based on the development demand of high conductivity and high strength of electrical materials,the functionalized carbon nanotubes reinforced copper matrix composites with a trace mount of Cr doping（ CuC r/CNTs） were successfully prepared through vacuum hot-pressing sintering. The influence of hot-pressing sintering process on the electrical conductivity and hardness of the samples was systematically studied.The results show that the hot pressing sintering process parameters significantly affect the grain size of the matrix and the amount of carbides formed at the interface. The optimal sintering process for this CuC r/CNTs material is that the sintering temperature is 900 ℃,the holding time is 1 h,and the pressure is 50 MPa. In this process,the appropriate amount of nano Cr₃C₂ phases formed at the interface,are conducive to the current transfer and load transfer by improving the wettability between Cu and CNTs and enhancing the interface bonding,which leads the electrical conductivity of the sample up to 96. 2%IACS and the hardness to 73. 0 HV. By cold rolling,the electrical conductivity and hardness of the sample could be further improved due to the alignment and the better dispersion state of CNTs,and the suppression of defects. After cold rolling,the electrical conductivity was maintained at 96. 6%IACS,the yield strength could reach 311 MPa and the tensile strength could reach 373 MPa,which shows a very good prospect of engineering application.更多还原