Patent ID: 8420160
Filing Date: 2013-04-16
Classification: B22F,C22C,H01F

Abstract:
1. A method for producing a sintered NdFeB magnet, comprising: applying a substance to a surface of the sintered NdFeB magnet, the substance being substantially a metal powder comprising (i) a rare earth element component (R) that is dysprosium and/or terbium and optionally at least one other rare earth element and (ii) an iron group transition element component (T) that is at least one member selected from the group consisting of iron, cobalt, and nickel; and then heating the magnet to diffuse dysprosium and/or terbium through grain boundaries of the magnet in order to increase coercivity of the magnet, wherein an oxygen content of the sintered NdFeB magnet is 5000 ppm or lower.