Method for preparing rare-earth permanent magnet
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorHyung Ju Lee
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for preparing a rare-earth permanent magnet. The method includes: preparing an R-T-B-based sintered magnet; applying a first mixture including a light rare-earth element onto the surface of the R-T-B-based sintered magnet and diffusing the first mixture under a vacuum atmosphere to prepare a light rare-earth permanent magnet having the light rare-earth element diffused into a grain boundary; and applying a second mixture including a heavy rare-earth element onto the surface of the light rare-earth permanent magnet and diffusing the second mixture into the grain-boundary under a vacuum atmosphere to prepare a rare-earth permanent magnet.
Claims11
A method for preparing a rare-earth permanent magnet, comprising:
- preparing an R-T-B-based sintered magnet;
- applying a first mixture comprising a light rare-earth element onto the surface of the R-T-B-based sintered magnet and diffuses the first mixture into a grain boundary of the R-T-B sintered magnet to prepare a light rare-earth permanent magnet having the light rare-earth element;
- and
- applying a second mixture comprising a heavy rare-earth element onto the surface of the light rare-earth permanent magnet and diffuses heavy rare-earth element into a grain boundary of the light rare-earth permanent magnet to prepare the rare-earth permanent magnet.
Dependencies are inferred from the claim text.