【摘要】 采用低成本、大规模的类粉末注射成形技术制备碳纳米管(CNTs)/铜基复合材料,研究了脱脂及烧结工艺、轧制温度及轧制道次以及CNTs含量对复合材料结构和性能的影响.结果表明,借助聚合物粘结剂能实现CNTs与铜粉的均匀混合,适当量的CNTs的加入对基体有明显的增强效果,含量为1%时得到的复合材料各项性能最好.对烧结后的样品进行热轧制处理,不但能够使铜基体的显微组织发生明显变化,产生显著的加工硬化效果,而且在大变形作用下,CNTs的分散也会变得更加均匀,从而明显提高复合材料的致密度和显微硬度.更多还原

【Abstract】 A powder injection moulding-like process for producing carbon nanotubes reinforced copper matrix composites was developed.The process is a promising low-cost and large scale technique for production of complex copper metal matrix nanometer composite.The result reveals that uniform dispersion of carbon nanotubes in copper matrix can be achieved by using polymer-based binder.It is found that debinding,sintering,hot rolling temperature and content of carbon nanotubes have significant effect on the microstructure and properties of composites.The composite with 1 w.t% carbon nanotubes exhibited the best mechanical performance.Furthermore,hot rolling approach plays important role not only for work-hardening effect,but also for uniform distribution of carbon nanotubes in matrix,resulting in significant improvement in density and hardness for composite.更多还原