Patent ID: 7722726
Filing Date: 2010-05-25
Classification: B22D,B22F,C22C,H01F

Abstract:
1. A method for producing alloy flakes for a rare earth sintered magnet, said alloy flakes having a structure containing an R-rich region and dendrites of an R 2 Fe 14 B phase with a dendrite content of not less than 80 vol %, said method comprising the steps of: (A) preparing an alloy melt of a composition consisting of: at least one element R selected from the group consisting of rare earth metal elements including yttrium, boron, and at least one element M selected from the group consisting of transition metals, silicon, carbon, and mixtures thereof, with iron being essential, (B) supplying and solidifying said alloy melt prepared in step (A) on a cooling roll under such conditions as to generate an alloy structure having an R-rich region and dendrites of an R