Diffusion bonding of NiZn ferrite and nonmagnetic materials

Diffusion bonding of dissimilar ceramics can be accomplished by the application of pressure only while the ceramics are at a temperature where their respective thermal expansion curves cross. A process for manufacturing magnetic head cores is disclosed wnere a NiZn ferrite is bonded by diffusion co a nonmagnetic ceramic by heating the core pieces to the crossover temperature and them applying the bonding pressure. The pressure can be removed either before or after the bonded pieces are cooled.