Mn-Zn ferrite production process, Mn-Zn ferrite, and ferrite core for power supplies

摘要

The invention provides a manganese-zinc ferrite production process comprising a maximum temperature holding step for firing and a cooling step in a nitrogen atmosphere. The nitrogen atmosphere changeover temperature T in the cooling step is below 1,1500° C. and equal to or higher than 1,0000° C., and the cooling rate V1 conforms to the condition defined by:; $PTEXTHILITALICPDATT/PDAT/ITALIC/HILPDAT\≦(/PDATHILITALICPDATV/PDAT/ITALIC/HILPDAT1\+1,450)/1.5\ \ (1)/PDAT/PTEXT$ ;Here T is the nitrogen atmosphere changeover temperature in ° C. and V1 is the cooling rate in ° C./hour from T down to 900° C.