热压烧结法制备多壁碳纳米管-Fe_3Al复合材料  

MWCNT-Fe_3Al composite fabricated by hot-pressing sintering

作　　者：庞来学[1] 徐静[1] 张爱琴[1] 范润华[2] 

机构地区：[1]山东交通学院土木工程系,济南250023 [2]山东大学材料科学与工程学院,济南250061

出　　处：《粉末冶金材料科学与工程》2011年第5期660-664,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：山东交通学院科研基金资助项目(z200816);国家自然科学基金资助项目(50772061)

摘　　要：采用热压烧结法制备多壁碳纳米管(multi-walled carbon nanotubes,MWCNT)增强Fe3Al金属间化合物基复合材料,用透射电镜(TEM)和扫描电镜(SEM)对该复合材料的显微形貌和结构进行分析,研究碳纳米管的添加量(体积分数,1%,3%,5%,7%)对材料压缩屈服强度的影响。结果表明:复合材料中的碳纳米管保持管状结构,以分散的纳米管或纳米管丛的形式进入到Fe3Al基体中,部分MWCNT与Fe3Al基体发生界面反应,形成V型凸起。碳纳米管可显著提高Fe3Al的抗压强度,其体积分数为5%时,抗压强度最高达2 142 MPa,比Fe3Al提高13.6%。当纳米管的体积分数为7%时抗压强度下降到1 950 MPa。Iron aluminides（Fe3Al） matrix composite strengthening with multi-walled carbon nanotubes（MWCNT） were fabricated by hot-pressing sintering,and its mechanical properties,micro morphology as well as microstructure were investigated.The results show that MWCNTS keep their hollow tube structure and enter into the Fe3Al base either dispersedly or in cluster,and exhibit excellent mechanical properties,for example,compressive yield strength reaches 2 142 MPa,which is 13% over the monolithic Fe3Al,has been obtained for the 5.0%（volume fraction） MWCNT-Fe3Al composite.However the compressive strength is decreased to 1 950 MPa in case of the volume fraction of the MWCNT increases to 7%.

关 键 词：MWCNT FE3AL金属间化合物 复合材料 微观结构 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]