电场活化烧结制备Cu-10Cr-0.5Al_2O_3复合材料  

Fabrication of Cu-10Cr-0.5Al_2O_3 composite materials by electric field activated sintering

作　　者：张寅[1] 李小强[1] 叶永权[1] 杨俊逸[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《粉末冶金材料科学与工程》2010年第3期212-218,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计(863计划)资助项目(2007AA03Z112);国家重点基础研究发展规划(973计划)专项课题(2007CB616905);广东省自然科学基金资助项目(8151064101000026)

摘　　要：对Cu-10Cr-0.5Al2O3(质量分数,%)混合粉末及球磨复合粉末,采用电场活化烧结技术制备高强高导电铜基块体材料,并研究脉冲峰值电流和通电烧结时间对烧结材料组织和性能的影响。结果表明,随着脉冲峰值电流增大,烧结材料的相对密度和导电率均提高,相对密度最高可达99%,硬度和抗弯强度则先上升后下降。当脉冲电流峰值为2.94 kA时,烧结材料具有较好的综合性能,相对密度、硬度、抗弯强度和电导率分别为97.5%、285HV、911MPa和50IACS%;随着通电烧结时间延长,烧结材料的密度、硬度、抗弯强度和导电率均逐渐上升,但烧结时间过长会引起硬度轻微下降;对Cu-10Cr-0.5Al2O3混合粉末进行球磨虽导致烧结材料的电导率下降,但可显著提高材料的硬度和抗弯强度。Electric field activated sintering（EFAS） technique was utilized to fabricate bulk copper matrix composite with high strength and high electrical conductivity from Cu-10Cr-0.5Al2O3（mass fraction,%） mixed powders and milled powders.The effects of the peak value of pulse current and sintering time on the microstructure and properties of as sintered sample were also studied.Results show that with the pulse current increasing,the relative density and electrical conductivity of sintered sample increase,and the maximum relative density reaches 99%.The hardness and bending strength first increase and subsequently decrease with the increasing of pulse current.Density,hardness,bending strength and electrical conductivity of sintered sample increase with the increasing of sintering time.However,overlong sintering time could cause a slight decrease in hardness.Although milling results in a decrease of electrical conductivity of sintered sample,it could essentially enhance the hardness and electrical conductivity.

关 键 词：粉末 电场活化烧结 铜基导电复合材料 

分 类 号：TF124[冶金工程—粉末冶金]