Abstract
The constraining layer, Bi2O3 addition, and uniaxial pressure effects on the microstructure and magnetic properties of low‐temperature‐fire NiCuZn ferrites during constrained sintering are investigated. It was observed that a ZrO2 green sheet can act simultaneously as a nonmagnetic layer and constraining layer for NiCuZn ferrites during constrained sintering. The required uniaxial pressure necessary to densify NiCuZn ferrites can be decreased significantly, and the grain growth can be promoted by adding Bi2O3 to relieve the sintered internal stress via viscous flow during constrained sintering. This approach is beneficial to the magnetic properties and mass production of large area NiCuZn ferrite substrates.
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