CPC H01F 41/0293 (2013.01) [H01F 1/0577 (2013.01)] | 20 Claims |
1. A method for increasing the coercivity of a sintered type NdFeB permanent magnet (2), the method comprising the following steps:
a) preparing of an organic film (3) with a predetermined thickness on a surface of the sintered type NdFeB permanent magnet (2);
b) creating holes (4) in the organic film (3) according to a given pattern with the holes (4) extending to the surface of the sintered type NdFeB permanent magnet (2);
c) filling the holes (4) with a metal powder (1), the metal powder (1) including or consisting of at least one of Dy and Tb; and
d) performing a thermally induced grain boundary diffusion process.
|