【作者】 刘向兵； 贾成厂； 王富祥； 盖国胜； 陈晓华；

【Author】 Liu Xiangbing~1,Jia Chengchang~1,Wang Fuxiang~2,Gai Guosheng~2,Chen Xiaohua~1 (1 Powder Metallurgy Institute,School of Material Science and Engineering, University of Science and Techology Beijing,Beijing 100083; 2 Power Technology R & D Group,Department of Material Science and Engineering, Tsinghua University,Beijing 100084)

【机构】 北京科技大学材料科学与工程学院粉末冶金研究所； 清华大学材料科学与工程系粉体工程研究所；

【摘要】 由机械合金化法（MA）制得纳米级Al₂O₃颗粒弥散镶嵌于微米级Cu颗粒表面的复合粉末,利用球形化工艺改善所制得的复合粉的形貌及粒度范围,然后分别用热压法和SPS法制备Cu-Al₂O₃复合材料。通过密度测试、电导率测试、抗弯强度测试、SEM复合粉形貌和烧结体断口分析、微区成分分析,对比研究了Al₂O₃质量百分含量分别为0%,0.5%, 1.0%,1.5%时Cu-Al₂O₃复合材料的物理、力学和电学性能。结果表明:不同制备工艺下随Al₂O₃含量增加,材料的抗弯强度先增后降;电导率除受杂质影响外,还受材料缺陷的影响,故变化规律不明显;对比Al₂O₃含量相同、分别用SPS法和热压法制得的Cu-Al₂O₃复合材料的致密度、抗弯强度及电导率,SPS法均高于热压法,但在弯曲应力下2种制备方法所得复合材料均发生延性断裂。更多还原

【Abstract】 Firstly the composite powder that nano-Al₂O₃ particle is dispersed on micrometer copper matrix is prepared by mechanical alloying（MA）.Secondly the shapes and size distributions of composite powder are improved by spherical process.Thirdly the nanometer Cu-Al₂O₃ composites individually are fabricated by hot pressing and SPS.The properties of composite samples which have separately mass fraction of Alumina 0%,0.5%,1.0%,1.5%are studied by the tests of density, electric conductivity,bending strength,the composite powder morphology and sintering composite fracture analysis by SEM and the element analysis of micro-area.The bending strength of composite is increased while the electric conductivity varies randomly with the improvement of mass fraction of Alumina,because the latter is determined by the fraction of second phase and defect.The SPS is superior to hot pressing comparing the density fiction,bending strength and electric conductivity of the composite with the same mass faction of Alumina.The ductile fracture occurs under bending loading.更多还原