High-coercivity sintered R-T-B permanent magnet material and manufacturing method therefor

Abstract

The invention discloses a high-coercivity sintered R-T-B permanent magnet material and a manufacturing method therefor. The manufacturing method comprises the following steps of A, preparing spherical powder comprising heavy rare earth elements; and B, coating an R-T-B series permanent magnet material manufactured by a normal process with the spherical powder comprising heavy rare earth elements in a laser coating mechanism. By virtue of the manufacturing method for the high-coercivity R-T-B series permanent magnet material provided by the invention, the magnet coercivity can be remarkably improved without influencing remanence, and meanwhile, the usage amount of the heavy rare earth elements is obviously lowered.

Description

technical field

[0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a method for manufacturing high-coercivity sintered R-T-B permanent magnet materials and R-T-B permanent magnet materials. Background technique

[0002] Sintered R-T-B series rare earth permanent magnet materials are widely used as the permanent magnet materials with the strongest magnetic properties. Coercive force is a very important performance index to measure the working stability of sintered R-T-B permanent magnet materials, and one of the most important means to improve the coercive force of magnets is to add heavy rare earth elements to the materials. However, heavy rare earth elements are very expensive due to the scarcity of reserves, difficulty in refining, and easy pollution of the environment. Even in the case of relatively small additions, they still occupy a very important part of the cost of magnet raw materials.

[0003] Therefore,...

Images