MnO2掺杂金属陶瓷惰性阳极的制备及性能研究

Preparation and Properties of Cermets Inert Anode with Adding MnO_2

以氧化铝-金属复合材料为基质，通过掺杂MnO2制备一种新型电解铝所用的陶瓷惰性阳极，并对添加MnO2的阳极材料的综合性能进行了考察．研究了MnO2对烧结性能的影响，并对样品进行了静态腐蚀实验的研究，测定了样品在500～1000℃下电导率随温度的变化．研究结果表明，添加MnO2有利于材料烧结且能改善材料的物化性能：烧结样品晶粒生长完整，致密度高；耐高温和抗冰晶石熔盐腐蚀性能好，平均腐蚀速率降为12、32mm／year；导电性能稳定、良好，具有半导体的导电性质，电导率随温度的升高而增大，测得850℃时样品的电导率为67S／cm．

Cermets with adding MnO2, used as the inert anode in aluminum electrolysis, were prepared. The effects of MnO2 on the properties of inert anode were researched. The inert anode on corrosion resistance properties were also studied, and determination of the conductivity of the sample in the temperature change range of 500-1000℃was made. The effects of MnO2 on sintering properties of inert anode were investigated. The results indicate that MnO2 improved sintering properties, crystal of cermets with adding MnO2 grew ideally, the cermets inter anode had a high density, high anti-oxidation, corrosion resistance and high conductivity. The annual corrosion rate of cermets with adding MnO2 was 12.32 mm/a. The electric conductivity was stable and good, which belongs to the electric conductivity property of the semiconductor. The conductivity increased with temperature increasing. The conductivities of cermets with adding MnO2 was 67 S/cm at 850 ℃.