Method of manufacturing fully dense Nd-Fe-B magnets with enhanced coercivity and gradient microstructure
| Publication Number: |
EP2869311A1 |
| Application Date: |
29. 10. 2013 |
| Assignee/Applicant: |
Jožef Stefan Institute [SI] |
| Inventor: |
Paul John McGuiness, Marko Soderžnik, Kristina Žagar, Andraž Kocjan, Spomenka Kobe |
| Title: |
Method of manufacturing fully dense Nd-Fe-B magnets with enhanced coercivity and gradient microstructure |
| Description: |
The present invention relates to a method of manufacturing fully dense Nd-Fe-B magnets by mixing Nd-Fe-B ribbons with a powder containing a heavy rare earth metal. The mixture comprises 1-4 wt% of the heavy rare earth metal and is in the first step spark plasma sintered to a fully dense nanocrystalline Nd-Fe-B magnet and subsequently in a second step annealed to allow the diffusion of the heavy rare earth metal. With this method an enhancement of coercivity of approximately 30 % can be achieved. |
| Drawings: |
 |
| Category: |
Nanotechnology and new materials |
| Technology application codes: |
Physical and exact sciences |
| Market application codes: |
Other electronics related, Industrial products |
| www: |
https://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20150506&DB=&locale=en_EP&CC=EP&NR=2869311A1&KC=A1&ND=4 |
| Patent offices: |
EPO |
