碳纳米管和氧化铝混杂增强铝基复合材料的制备及力学性能

Fabrication and Mechanical Properties of Aluminum Matrix Composites Reinforced with Carbon Nanotubes and Alumina

采用化学气相沉积结合机械球磨的方法制备了碳纳米管(CNTs)和Al_2O_3颗粒混杂增强铝基复合材料,研究了球磨时间、Al_2O_3含量对复合材料组织和力学性能的影响。结果表明:本方法可以获得CNTs和Al_2O_3颗粒在铝基体内的均匀分散。随球磨时间的增加,复合材料的硬度随之增大;当球磨时间为180min时,复合材料硬度达纯铝的2.1倍。此外,随Al_2O_3颗粒含量的增加,复合材料的硬度和压缩屈服强度均不断提高。当Al_2O_3的质量分数为4%时,CNTsAl_2O_3/Al复合材料的硬度达112.1HV,为纯铝的2.8倍;压缩屈服强度达416MPa,为纯铝的4.6倍,说明CNTs和Al_2O_3的混杂加入发挥了良好的协同增强效果。

The Al composites reinforced by carbon nanotubes（CNTs）and Al2O3 particles were fabricated by chemical vapor deposition（CVD）and ball milling method.The effect of milling time and Al2O3 content on the microstructure and mechanical properties of composites was studied.The results show that the uniform dispersion of CNTs and Al2O3 reinforcements in the Al matrix can be achieved by using this method.As the milling time increases,the microhardness of composite increases.When the milling time is 180 min,the microhardness of composites reaches 2.1times of pure Al.In addition,the microhardness and compressive yield stress of CNTs-Al2O3/Al composites both increase as the Al2O3 content increases.When the mass fraction of CNT reaches 4%,the microhardness and compressive yield stress of CNTs-Al2O3/Al composites are 112.1HV and 426 MPa,which are the 2.8and4.6times as large as that of pure Al,respectively.The results indicate that the hybrid addition of CNTs and Al2O3 play good synergic enhanced effect.