Patent ID: 7172660
Filing Date: 2007-02-06
Classification: H01F

Abstract:
1. A method of making an amorphous soft magnetic core comprising the steps of: performing a preliminary thermal treatment of amorphous metal ribbons of an Fe-based amorphous metal alloy produced by a rapid solidification process, the amorphous metal alloy comprising Fe as a basic composition and at least one element selected from the group consisting of P, C, B, Si, Al and Ge as an auxiliary element; crushing the amorphous metal ribbons to thereby obtain amorphous metal powders; classifying the amorphous metal powders to then be mixed into a distribution of powder particles made of first powders having passed through a sieve of −100˜+140 meshes of 35˜45%, and second powders having passed through a sieve of −140˜+200 meshes of 55˜65%; mixing the mixed amorphous metal powders with a binder, and then forming a core; and annealing the formed core and then coating the core with an insulating resin.