Interfacial Reaction Between Low‐Temperature Co‐fired Ceramics and NiCuZn Ferrites in Multilayer Composites

Abstract

In this study, the co‐firing behavior and interfacial interaction between a low‐dielectric‐constant low‐temperature co‐fired ceramics (LTCC) and NiCuZn ferrites at 900°C were studied using X‐ray diffractometer, dilatometer, scanning electron microscopy, electron probe microanalysis, and transmission electron microscope. It was observed that the delamination occurred at the interface between LTCC and NiCuZn ferrites added with Bi2O3. It may be due to the Bi concentrated at the interface and diffused into LTCC, which shifted the densification curve of LTCC toward low temperature, and hence resulted in the shrinkage mismatch between LTCC and NiCuZn ferrites.

Low-temperature co-fired Ni–Ti co-substituted barium ferrites

“…The sintering temperature of barium ferrite is too high so that it cannot be applied to low-temperature co-fired technology. Based on reports so far, [17][18][19] Bi 2 O 3 additive is considered as the most effective sintering aid for ferrites. Bi 2 O 3 additive, with a melting point of 824 C, could lower the sintering temperature of ferrite by liquid phase sintering.…”