Patent ID: 11948734
Assignee: YANTAI SHOUGANG MAGNETIC MATERIALS INC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 0:
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.