论文部分内容阅读
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 comprehensive performance of inert anode materials for cermet used in aluminum electrolysis, a Ag / NiFe2O4 anode material with cylindrical gradient network was prepared. The gradient structure was achieved by the lamination method. The content of Ag decreased from the core to the external metal in turn, and the outermost layer was pure ceramic NiFe2O4. The mesh distribution of the metal phases in the cermet layer was achieved by grading of raw materials. The results showed that for a certain size of sample, the graded mesh anode can be successfully fabricated by designing the proper number of layers and composition and grading of each layer. The conductivity and corrosion resistance of the samples containing 30% (mass fraction) Ag in the core were tested and found that the conductivity of the gradient mesh structure anode was better than that of the uniform structure anode containing the same amount of metal Ag. The outermost layer of anode is pure ceramic, showing good corrosion resistance. Gradient mesh structure combines the advantages of gradient structure with the advantages of mesh structure, which can effectively improve the overall performance of anode material.