Preparation NiFe2O4 Matrix Inert Anode Used in Aluminum Electrolysis by Adding Nanopowder

Abstract

Two-step sintering process was adopted to prepare NiFe2O4 matrix inert anode in this research. In the process of synthesizing NiFe2O4 spinel, Fe2O3 and NiO powders as raw materials added additives were synthesized at 1000 . Through crushing and screening, adding NiFe2O4 nanopowder, particle gradation and compression molding, the nickel ferrite matrix ceramic inert anode was sintered secondarily at 1250 for 6h. The effect of addition level of nanopowder on the density and porosity, bending strength and impact toughness was investigated emphatically. The results showed the addition of NiFe2O4 nanopowder had significantly increased the bending strength and impact toughness of NiFe2O4 matrix ceramic inert anode. Inert anodes had the best comprehensive properties while adding 60wt% nanopowder. The values of density and porosity were 4.62g/cm3 and 5.2% respectively, the value of bending strength was 53.39MPa and the value of impact toughness was 3.19J/cm2.