Patent ID: 9607743
Date: 2017-03-28
CPC Classifications: B22F,B32B,C22C,H01F

Claim:
1. A R-T-B based sintered magnet, comprising: major phase grains having core portion and shell portion that covers the core, when the mass concentration of R1 and Ce in said core portion is set as αR1 and αCe respectively, and the mass concentration of R1 and Ce in said shell portion is set as βR1 and βCe respectively, the ratio (B/A) between the mass concentration ratio of R1 to Ce in said shell portion (βR1/βCe=B) and that of R1 to Ce in said core portion (αR1/αCe=A) is 1.10 or more, wherein, R includes Ce and R1, R1 comprises Nd and optionally at least one other rare earth element except Ce, and T is at least one transition metal element including Fe or the combination of Fe and Co, and the content ratio of R1 and Ce in the rare earth element R is 50:50-90:10.