Patent ID: 7938915
Filing Date: 2011-05-10
Classification: B22F,C22C,H01F

Abstract:
1. A method for producing a rare-earth alloy based binderless magnet, the method comprising the steps of: (A) providing a rapidly solidified rare-earth alloy magnetic powder; (B) compressing and compacting the rapidly solidified rare-earth alloy magnetic powder by a cold process at a temperature of 100° C. or less without using a resin binder, thereby obtaining a compressed compact, 70 vol % to 95 vol % of which is the rapidly solidified rare-earth alloy magnetic powder, wherein the rapidly solidified rare-earth alloy magnetic powder is compressed under a pressure of 500 MPa to 2,500 MPa; and (C) subjecting the compressed compact to a heat treatment process at a temperature of 350° C. to 800° C. after the step (B) has been performed.