Patent ID: 9224527
Filing Date: 2015-12-29
Classification: B22D,C22C,H01F

Abstract:
1. A method for producing an ultrafine-crystalline alloy ribbon having a structure in which ultrafine crystal grains having an average grain size of 1-30 nm are dispersed at a ratio of 5-30% by volume in an amorphous matrix, comprising the steps of ejecting an alloy melt onto a rotating cooling roll to quench it; forming a ribbon having such toughness that it is not fractured when bent to a bending radius of 1 mm or less, before a start of winding around a reel; and changing the forming conditions of said ribbon after the start of winding around a reel, to obtain the structure in which ultrafine crystal grains having the average grain size of 1-30 nm are dispersed at a ratio of 5-30% by volume in the amorphous matrix.