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(2.8 V～3.2 V),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2.2 V～2.5 V,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.
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