摘要
采用高能球磨法制备了纳米Al2O3p/Cu复合材料粉体,复合粉体经过压制、烧结和挤压后成为铜复合材料,采用X射线衍射(XRO)、扫描电镜(SEM)、能谱仪(EDS)、电导仪等测试方法,研究了球磨后的复合粉体和复合材料显微结构、电导率和硬度。实验证明,粉体经过2h以上球磨后,Al2O3相逐渐消失,复合粉体为纳米晶结构,晶粒直径66-87nm。随着Al2O3粉体含量增加,铜复合材料的电导率显著下降。烧结后挤压有利于复合材料导电性能的提高。当Al2O3粉体含量1wt%、球磨6h时,烧结后重新挤压的复合材料试样电导率IACS76%、硬度HB83.8。
Nanocomposite powders of nano-Al2O3p/Cu are prepared by high energy ball milling, and composite powders become copper matrix composite by pressing, sintering and extruding. The microstructure, conductivity and hardness of composite powders and composite are tested by measurement of XRD, SEM, EDS, Conductivity Apparatus and so on. The results show that Al2O3 phase fades away gradually, those nanocomposite powers are nanocrystals, and the grain size of crystal is 66-87nm after ball milling more than 2 hours. With increasing of Al2O3 powders, conductivity of the composite decreases obviously. Extruding after sintering is better to enhance the conductivity. When the content of powers reaches 1wt% and milling time for 6 hours, conductivity of composite reaches IACS 76% and the hardness reaches HB 83. 8 by extruding after sintering.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2006年第F11期196-197,共2页
Materials Reports
基金
国家自然科学基金(10576014)
关键词
球磨
纳米复合材料
电导率
ball milling, nanocomposite, electric conductivity