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Home > Issues > RetrieveLow Melting-point Diffusion Salts of Heavy Rare-earth for Enhancing Coercivity of Grain-boundary-diffusion-processed Nd-Fe-B-type Magnet
Journal of Magnetics, Volume 25, Number 2, 30 Jun 2020, Pages 205-209
J. Y. Choi (Pukyong National University), H. W. Kwon * 
(Pukyong National University), B. A. Kim (Pukyong National University), J. G. Lee * (Korea Institute of Materials Science)
(Pukyong National University), B. A. Kim (Pukyong National University), J. G. Lee * (Korea Institute of Materials Science)
Abstract
Effective low melting-point Dy-diffusion for grain boundary diffusion treatment for enhancing coercivity in Nd-
Fe-B-type magnet was found in the DyF3–LiF binary system. Efficacy of the low melting-point (DyF3–LiF) diffusion
source as Dy-diffusion source for enhancing coercivity in the diffusion processed Nd-Fe-B-type magnet
was investigated. Speedier and more profound coercivity enhancement in the Nd-Fe-B-type magnet was
achieved by grain boundary diffusion using the low melting-point (DyF3–LiF) diffusion source with respect to
solid DyF3 single salt. Since the liquid in the (DyF3–LiF) mixture contained plenty of Dy atoms already freed
from DyF3 and they were in better contact with magnet, speedier and profuse diffusion of Dy atoms through
Nd-rich grain boundary was possible in the magnet coated with low melting-point (DyF3–LiF) diffusion source.
Fe-B-type magnet was found in the DyF3–LiF binary system. Efficacy of the low melting-point (DyF3–LiF) diffusion
source as Dy-diffusion source for enhancing coercivity in the diffusion processed Nd-Fe-B-type magnet
was investigated. Speedier and more profound coercivity enhancement in the Nd-Fe-B-type magnet was
achieved by grain boundary diffusion using the low melting-point (DyF3–LiF) diffusion source with respect to
solid DyF3 single salt. Since the liquid in the (DyF3–LiF) mixture contained plenty of Dy atoms already freed
from DyF3 and they were in better contact with magnet, speedier and profuse diffusion of Dy atoms through
Nd-rich grain boundary was possible in the magnet coated with low melting-point (DyF3–LiF) diffusion source.
Keywords: Nd-Fe-B magnet; grain boundary diffusion; liquid diffusion source
DOI: https://doi.org/10.4283/JMAG.2020.25.2.205
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