铝电解用梯度网状惰性Ag/NiFe_2O_4阳极的制备及性能  

PREPARATION AND PROPERTIES OF GRADIENT-NETWORK Ag/NiFe_2O_4 CERMETS INERT ANODES USED IN ALUMINUM ELECTROLYSIS

作　　者：席锦会[1,2] 谢英杰 葛世荣[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221008 [2]西部钛业有限责任公司,西安710201

出　　处：《硅酸盐学报》2010年第2期241-245,264,共6页Journal of The Chinese Ceramic Society

基　　金：中国矿业大学科技基金(2006A050);江苏省博士后科研资助计划(0702058C)资助项目

摘　　要：为了提高铝电解用金属陶瓷惰性阳极材料的综合性能,制备了圆柱形梯度网状结构的Ag/NiFe2O4阳极材料。采用叠层法实现梯度结构,从芯部到外部金属Ag含量依次减少,最外层为纯陶瓷NiFe2O4;采用原料粒度级配实现金属陶瓷层中金属相的网状分布。结果发现:对于一定规格的样品,通过设计合适的层数、各层的成分和粒度级配可成功制得梯度网状结构的阳极。对芯部含30%(质量分数)Ag的样品进行导电性、抗腐蚀性的测试发现,梯度网状结构阳极的导电性优于含等量金属Ag的均匀结构阳极。阳极最外层为纯陶瓷,表现出很好的抗腐蚀性。梯度网状结构将梯度结构的优点和网状结构的优点相结合,能够有效提高阳极材料的综合性能。In order to improve the overall properties of cermets inert anodes used in aluminum electrolysis,the Ag/NiFe2O4 cermets with gradient-network structure were prepared by the powder metallurgic method.The gradient structure was realized by power stacking.The content of metal Ag decreases from the core to the outer layer and the composition in the outer layer only includes NiFe2O4.The network distribution of metal phase in cermets was obtained by grain graduation.It is found that,the certain-size sample can be prepared successfully,if the proper layer number,the composition of each layer and grain graduation were adopted.The microstructure,conductivity and corrosion resistance were investigated using the samples with 30% （in mass） Ag in core.The results indicate that the electrical conductivity of the sample with gradient-network structure is higher than that of the conventional material with similar Ag content.The sample has good corrosion resistance because the composition in outer layer is NiFe2O4 only.The gradient-network structure combine the merit of gradient structure with that of network structure,which can improve the overall properties of cermet inert anodes.

关 键 词：惰性阳极 银/镍铁尖晶石 梯度网状结构 粒度级配 导电性 抗腐蚀性 

分 类 号：TF777[冶金工程—钢铁冶金]