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:
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