Effect of Nanopowder Content on Properties of NiFe2O4 Matrix Inert Anode for Aluminum Electrolysis

Abstract

Two-step sintering process was adopted to prepare NiFe2O4 matrix inert anode for aluminum electrolysis in this research. In the process of synthesizing NiFe2O4 spinel, Fe2O3 and NiO powders as raw materials added additives were synthesized at 1000 °C for 6h. Through crushing and screening, adding NiFe2O4 nanopowder, particle gradation and compression molding, the nickel ferrite matrix ceramic inert anode was sintered secondarily at 1300 °C for 6h. The effect of NiFe2O4 nanopowder content on the density and porosity, bending strength and impact toughness was investigated in details. The results showed the addition of NiFe2O4 nanopowder had considerable influence on the properties of NiFe2O4 matrix ceramic inert anode. Inert anodes had the best comprehensive properties while adding 30 wt% nanopowder. The values of density and porosity were 4.86 g/cm3 and 3.5% respectively, the value of bending strength was 42.47 MPa and the value of impact toughness was 3.31 J/cm2.