铝电解用TiB_2/Al_2O_3复合阴极的烧结与性能研究  

Sintering and Properties of TiB_2/Al_2O_3 Composite Cathode for Aluminum Electrolysis

作　　者：韩硕[1] 李劼[1] 张凯[1] 吕晓军[1] 赖延清[1] 石岩[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：《有色金属（冶炼部分）》2011年第9期13-17,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家高技术研究发展计划项目(2008AA030502);国家科技支撑计划项目(2009BAE85B02)

摘　　要：以氧化铝溶胶为粘结剂,采用冷压烧结法制备出铝电解用TiB2/Al2O3复合阴极材料,研究了烧结温度、烧结时间和溶胶添加量对复合阴极相对密度、电阻率和抗压强度的影响。结果表明:烧结温度的提高能够增加复合阴极的相对密度,同时有利于降低复合阴极电阻率。1 400℃烧结的复合阴极相对密度可达93.83%,电阻率最低为0.56μΩ.m。随着烧结时间的延长,复合阴极的电阻率先降低后增加。烧结时间为5 h时复合阴极电阻率最低,为0.72μΩ.m。当溶胶含量为25%,1 400℃烧结5 h时,复合阴极材料性能最佳,其电阻率可达0.72μΩ.m、抗压强度为38.70 MPa。TiB2/Al2O3 composite cathodes for aluminum electrolysis,in which colloidal alumina was added as binder,were prepared by cold pressing-sintering method.The relationship between relative density,electrical resistivity,compressive strength and sintering temperature,sintering time,mass fraction of colloidal alumina was studied.The results showed that the relative density and the compressive strength increased with the improvement of sintering temperature,while the electrical resistivity of TiB2/Al2O3composite cathode decreased.The relative density and the compressive strength increased with the improvement of the mass fraction of colloidal alumina,and the relative density and the compressive strength increased with the improvement of sintering time,while the electrical resistivity of TiB2/Al2O3composite cathode first decreased and then increased.Furthermore,the optimized sintering techniques of composite cathode was obtained,and the composite cathode prepared by mixing TiB2 with colloidal alumina（25% mass fraction）,sintered at 1 400 ℃ for 5 hours,has a electrical resistivity of 0.72 μΩ·m and a compressive strength of 38.70 MPa.

关 键 词：铝电解 TIB2 氧化铝溶胶 烧结温度 烧结时间 

分 类 号：TF821[冶金工程—有色金属冶金]