Effect of adding methods of metallic phase on microstructure and thermal shock resistance of Ni/(90NiFe 2O 4-10NiO)cermets

Abstract

Ball mixing and electroless plating were respectively used as the adding methods of metallic phase to prepare Ni/(90NiFe 2O 4-10NiO) cermets for the inert anode in aluminum electrolysis. The microstructure and thermal shock resistance of cermet samples were studied. The results show that, for the samples prepared by ball mixing method, aggregation of metallic phase is found in either the green blocks or sintered samples and the extent of aggregation increases with the increase of metal content. For 6.5Ni/(90NiFe 2O 4-10NiO) cermets prepared with electroless plating method, the homogeneous and fine metallic particles are found in either the green compacts or sintered samples, but the relative density and thermal shock residual strength decrease by 3% and 28%–58% respectively, compared with samples prepared with ball mixing method.