Joined ferrite-titanate ceramic substrates by hot-pressing

Composite formation of a magnetic ferrite with nonmagnetic oxides provide a useful application for microwave integrated systems. Holst and Lemke [1] and Paladino and Snider [2] have prepared ferrite-dielectric oxide composites by conventional sintering and hot-pressing, respectively. We examined the joining of NiZn ferrite with ilmenite type titanates, FeTiO3, CoTiO3, and NiTiO3by a hot-pressing technique [3]. Under a hot-pressing condition of 1200°C, 200 kg/cm²for air 2 h, a combination of the ferrite and NiTiO3was successful in joining without any cracks, but the other combinations of the ferrite with FeTiO3and CoTiO3were destructive at the interfacial boundaries. For photomicrographs and additional details, see Digests of the 1972 Intermag Conference (available from IEEE Headquarters).