Patent ID: 7175717
Filing Date: 2007-02-13
Classification: B22F,H01F

Abstract:
1. A method of making a soft magnetic core having an excellent high-frequency characteristic comprising the steps of: performing a thermal treatment of Fe-based amorphous metal ribbons produced by using a rapid solidification process (RSP) to then be converted into nano-scale grain metal ribbons; crushing the nano-scale grain metal ribbons to thereby obtain nano-scale grain metal powders; classifying the nano-scale grain metal powders to then be mixed into a distribution of powder particles made of first powders that have passed through a sieve of −100˜+140 meshes of 15˜65%, and second powders that have passed through a sieve of −140˜+200 meshes of 35˜85%; mixing the mixed nano-scale grain metal powders with a binder, and then forming a core; and annealing the formed core and then coating the core with an insulating resin.