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NiCuZn Ferrite Cores by Gelcasting: Processing and Properties
Year: 2017 | Author: Lanbing Liu | Paper: T1.3
Fig. 1. Complex permeability of gelcast cores sintered at different peak temperatures and that of 4F1 core.
In this study, we used the pressure-less gelcasting process to fabricate a NiCuZn ferrite aimed at simplifying the integration of magnetic components for power electronics converters. A commercial NiCuZn powder was gelcast into toroid-shaped magnetic cores and then sintered at different peak temperatures. Both the complex permeabilities and core-loss densities at high magne tic flux density and high frequency were measured.
By varying the sintering temperature from 900°C to 1000°C, the real part of the permeability of the gelcast NiCuZn core could be improved from 44 to 77. For the gelcast core sintered at 950°C, its core-loss density at 5 MHz was found to be 50% lower than that of a commercial NiZn (4F1) ferrite core. Because of its ease, flexibility, and scalability, gelcasting has the potential to enable the integration of novel designs of magnetics for shaping and coupling magnetic fluxes aimed at achieving higher efficiency and power density of high-frequency power electronics converters.
Fig. 2. Core-loss densities of sintered cores by gelcasting and NiZn ferrite (4F1) core at 5 MHz.
