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NiFe2O4 matrix cermet inert anodes for aluminum electrolysis were prepared with Cu-Ni mixed powders as toughening metallic phase and 15NiO-85NiFe2O4 as ceramic matrix via powder metallurgy two-step sintering method. The mixed metallic contents varied from 10 to 18 (mass fraction, %) with 2% intervals. The phase composition, microstructure of composite and the effect of metallic content on the density, porosity, fracture toughness and bending strength were studied in details. The results show the densities of cermets increase with metallic content increase while decrease for porosities. The fracture toughness and bending strength first increase and then decrease with the increase of metallic content. When the metallic content was 16%, the maximum values of fracture toughness and bending strength were 105.19MPa and 2.73MPam 1/2 respectively. The results imply that the cermet containing 16% metals should be further studied to confirm the optimal metallic content for NiFe2O4 matrix cermet inert anodes used in aluminum electrolysis.

Effect of Metallic Content on Properties of NiFe2O4 Matrix Cermet Inert Anodes for Aluminum Electrolysis