Method of Manufacturing Fully Dense Nd-Fe-B Magnets with Enhanced Coercivity and Gradient Microstructure
| Publication Number: |
EP2869311B1 |
| 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: |
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| 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/patent/search/family/049553978/publication/EP2869311B1?q=EP2869311B1 |
| Patent offices: |
EPO |
