碳纳米管增强铜基复合材料的类注射成型方法制备研究

Powder Injection Moulding-like for Carbon Nanotubes Reinforced Copper Matrix Composite

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.

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 produc-tion 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 debind- ing, sintering, hot rolling temperature and content of carbon nanotubes have significant effect on the micro- structure 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-harden- ing effect, but also for uniform distribution of carbon nanotubes in matrix, resulting in significant improve- ment in density and hardness for composite.