金属含量对Cu-Ni-NiFe_2O_4金属陶瓷导电性能的影响  

Effect of Adding Cu-Ni on Mechanical Capacity andElectrical Conductivity of NiFe_2O_4-based Cermets

作　　者：赖延清[1] 张刚[1] 李劼[1] 刘业翔[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2004年第6期880-884,共5页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划项目(G1999064903);国家"863"计划项目(2001AA335013);湖南省自然科学基金资助项目(03JJY3080)

摘　　要：制备了添加不同含量的Cu和Ni金属粉末作为导电组元的NiFe2O4基金属陶瓷材料,研究了材料的物相组成、显微组织以及金属相含量对材料致密度和电导率的影响。研究结果表明,所制备的金属陶瓷材料由NiFe2O4和Cu Ni合金相组成,其中细小且形状不规则的(Cu Ni)相均匀地镶嵌在NiFe2O4陶瓷基体上;试样的致密度在金属含量为0～20%范围内存在极大值;Cu Ni NiFe2O4金属陶瓷遵循半导体导电机理,其电导率随着温度的升高和金属含量的增大而增大。Cu-Ni-NiFe_2O_4 cermets were prepared by using NiFe_2O_4 as ceramic matrix and the mixed powders of Cu and Ni as electrical conducting metallic elements. The phase compositions, the mirco-structures and effects of contents of metal phases Cu-Ni on the relative density and electrical conductivity of cermets were studied. The results show that the cermets are consisted of NiFe_2O_4 and Cu-Ni, Cu-Ni disperse on the surface of NiFe_2O_4. The relative density comes to the maximum while the content of metallic phase varies from 0 to 20%. The mechanism of electrical conductivity of Cu-Ni-NiFe_2O_4 obeys the rule of electrical mechanism of semiconductor. The conductivity of samples increases with increasing temperature and content of metal.

关 键 词：NIFE2O4 金属陶瓷 半导体 惰性阳极 铝电解 

分 类 号：TF821[冶金工程—有色金属冶金]