【摘要】 采用热压烧结的方法制备了镍铁尖晶石基金属陶瓷试样,用于铝电解的惰性阳极。实验制得了相对密度大于98%的阳极试样,并研究了试样的导电性能和抗电解质腐蚀性能。结果表明,所得的阳极试样的电导率随温度的升高而增大,在900℃时电导率在40Ω-1·cm-1~60Ω-1·cm-1之间。在电解过程中,阳极电压降平稳(2.8V~3.2V),表明阳极的电阻在电解过程中没有明显变化,导电性能稳定。用反电动势法测量电解反应的分解电压为2.2V~2.5V,表明电解反应为2Al2O3=4Al+3O2,电极呈现良好的惰性。电子显微分析表明,试样抗冰晶石-氧化铝熔盐腐蚀的性能良好,电解质通过对Fe2O3的溶解来腐蚀阳极。更多还原

【Abstract】 Hot pressing-sintering was adopted to fabricate the inert cermets anodes based on the nickel ferrite in aluminum electrolysis. The samples with relative density of more than 98% were tested for evaluating their electrical conductivity and corrosion resistance to the electrolyte. The experimental results show that the electrical conductivity of the anodes increases with the increasing of temperature, ranging from 40Ω-1·cm-1 to 60Ω-1·cm-1at 900℃. In the electrolysis process, the cell voltage was calm (2.8 V ~3.2 V), indicating that the resistance of anode didn’t obviously change in the electrolysis and the conductivity performance is calm. The voltage of the electrolysis reaction is 2.2 V ~2.5 V by way of measuring the back electromotive force, which indicates that, the reaction is 2Al2O3=4Al+3O2 , and the electrode takes on good inertia. SEM indicates that the anode samples show good corrosion resistance in the cryolite-alumina melts, and the dissolution of Fe2O3 is the main way of anode corrosion by the electrolyte.更多还原