Title :
Development of low loss Mn-Zn ferrites having the fine microstructure
Author :
Otobe, S. ; Yachi, Y. ; Hashimoto, T. ; Tanimori, T. ; Shigenaga, T. ; Takei, H. ; Hontani, K.
Author_Institution :
FDK Corp., Shizuoka, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
We studied relations between the microstructure and core loss of Mn-Zn ferrites for power supplies. As the results, we found that the lowest core loss was achieved at 100 kHz and 200 mT condition when the average grain size were 15 to 17 μm. Then, we examined the effect of the third element in addition to CaO-SiO2 on their deposition behavior in the grain boundary and we found the some additives such as Nb2O5, Ta2O5 and ZrO2 which reduce the core loss. Further more, by optimizing the sintering condition, we were able to obtain the extremely low loss Mn-Zn ferrite material for power applications
Keywords :
crystal microstructure; eddy current losses; ferrites; grain size; manganese compounds; sintering; zinc compounds; (MnZn)Fe2O4; 100 kHz; 15 to 17 mum; average grain size; core loss; fine microstructure; grain boundary; low loss Mn-Zn ferrites; lowest core loss; sintering condition; Additives; Ball milling; Core loss; Ferrites; Frequency; Grain boundaries; Magnetic flux density; Magnetic materials; Microstructure; Power supplies;
Journal_Title :
Magnetics, IEEE Transactions on
