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Coercivity, microstructure, and thermal stability of sintered Nd–Fe–B magnets by grain boundary diffusion with TbH3 nanoparticles

Coercivity, microstructure, and thermal stability of sintered Nd–Fe–B magnets by grain boundary... Grain boundary diffusion technique with TbH3 nanoparticles was applied to fabricate Tb-less sintered Nd–Fe–B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet are improved by 112 % and reduced by 26 % compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient (α) and the coercivity temperature coefficient (β) of the magnets are improved after diffusion treatment. Microstructure shows that Tb element enriches in the surface region of Nd2Fe14B grains and is expected to exist as (Nd,Tb)2Fe14B phase. Thus, the magneto-crystalline anisotropy field of the magnet improves remarkably. As a result, the sintered Nd-Fe-B magnets by grain boundary diffusion with TbH3 nanoparticles exhibit enhanced coercivity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Rare Metals Springer Journals

Coercivity, microstructure, and thermal stability of sintered Nd–Fe–B magnets by grain boundary diffusion with TbH3 nanoparticles

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References (17)

Publisher
Springer Journals
Copyright
Copyright © 2014 by The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg
Subject
Materials Science; Metallic Materials; Nanotechnology; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Inorganic Chemistry; Physical Chemistry
ISSN
1001-0521
eISSN
1867-7185
DOI
10.1007/s12598-014-0295-2
Publisher site
See Article on Publisher Site

Abstract

Grain boundary diffusion technique with TbH3 nanoparticles was applied to fabricate Tb-less sintered Nd–Fe–B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet are improved by 112 % and reduced by 26 % compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient (α) and the coercivity temperature coefficient (β) of the magnets are improved after diffusion treatment. Microstructure shows that Tb element enriches in the surface region of Nd2Fe14B grains and is expected to exist as (Nd,Tb)2Fe14B phase. Thus, the magneto-crystalline anisotropy field of the magnet improves remarkably. As a result, the sintered Nd-Fe-B magnets by grain boundary diffusion with TbH3 nanoparticles exhibit enhanced coercivity.

Journal

Rare MetalsSpringer Journals

Published: Jun 28, 2014

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