Patent ID: 9443652
Filing Date: 2016-09-13
CPC Classification: B22F,C21D,C22C,C23C,H01F

Claim Text:
1. A method of manufacturing soft magnetic cores having an excellent high current DC biased characteristic and an excellent core loss characteristic, the method comprising the steps of: performing a preliminary heat treatment of Fe-based amorphous metal ribbons prepared by using a rapid solidification process (RSP) and nanocrystallizing the preliminarily heat treated Fe-based amorphous metal ribbons; obtaining alloy powders made of nanocrystalline grains obtained by grinding the metal ribbons; after classifying the alloy powders, mixing the alloy powders so that a particle size distribution is configured to have a particle size of 75˜100 μm with 10˜85 wt %, a particle size of 50˜75 μm with 10˜70 wt %, and a particle size 5˜50 μm with 5˜20 wt % to thereby obtain mixed powders; obtaining a core molded body by adding the mixed powders with a binder and compression molding the mixed powders mixed with the binder; and performing an annealing treatment of the core molded body, and coating the annealing treated core molded body with an insulating resin, to thus prepare the soft magnetic cores.