Fabrication and test of metal matriz composites as advanced anodes for aluminum electrolysis
A new type of metal matrix composite with a composition of Al2O3-33.8Fe-26.2Ni (wt.％) used as inert anode was developed in this article. Aluminum electrolysis with this anode was conducted for 12 hours at 850℃ with a 1.8:1 molar ratio of cryolite which consisted of NaF-AlF3-8wt％NaCl-5wt％CaF2-4wt％Al203. The anodic current density was 0.75A/cm2. Electrolysis carried out smoothly with relatively stable cell voltage. Electron Probe Microanalyzer results showed that a film on anodic substrate was characterized by two layers. The outer oxide layer were Na3AlF6 and FeAl2O4, while the inner layer was complicated cermets, including A12O3, NiO and FeAl2O4 ceramic and Ni3Fe, Ni3AI metallic phase. These phases in inner layer were dispersed each other. The anodes showed good performance in terms of electronic conductivity, anti-oxidation and anti-corrosion, thermal shock resistance, as well as mechanical robust. The wear rate of the anode is 19 mm per year, and the purity of aluminum produced is 98-99％.
inert anodes metal matriz composites aluminum electrolysis wear rate protective film 铝电解 金属基复合材料
Shi Zhongning Xu Junli Qiu Zhuxian
P.O.Box 117,College of Materials and Metallurgy,Northeastern University,Shenyang,Liaoning 110004,China
国内会议
沈阳
英文
105-112
2004-09-08（万方平台首次上网日期，不代表论文的发表时间）