抄録
New and emerging ferrite applications where significant power is involved (i.e. in automotive), impose stronger demands on the performance of magnetic cores, such as that the components should exhibit higher saturation flux densities at high temperatures, than those currently exhibited by existing components, with the lowest possible effects on other important magnetic properties (i.e. initial magnetic permeability, power losses). In this article the development of a MnZn ferrite polycrystalline material is reported with a saturation flux density of 642 mT at 10 kHz, 1200 A/m, 25°C and 550 mT at 100°C. The initial permeability is 1020 (10 kHz, 0.1 mT, 25°C) and the power losses 800 mW cm−3 (100 kHz, 200 mT, 100°C). The previous results place this material among the best in its class. The improvements have been realized through optimizations in the design of the antiferrimagnetic unit cell lattice as well as through optimizations on the processing and the microstructural evolution of the polycrystalline structure.
