FABRICATION PROCESS FOR BARIUM TITANATE-FERRITE FUNCTIONALLY GRADED CERAMICS

The purpose of this work is to develop a fabrication process to produc e barium titanate-ferrite functionally graded multilayer ceramics by d ry pressing. Two materials were used; a dielectric powder based on BaT iO3 and a magnetic Ni-Zn ferrite which were co-sintered. Two types of cracks were observed after sintering. A Scanning Electron Microscopy ( SEM) examination of the sintered samples was performed in order to det ermine whether the cracks appear during the forming method or are due to thermal mismatching between the two materials. A crack free non sym metric configuration multilayer was obtained by sequentially stacking, pressing and sintering. (C) 1998 Elsevier Science Limited. All rights reserved.