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Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state


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Title: Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state
Authors: Fukunaga, Hirotoshi / Yamamoto, Ikuo / Nakano, Masaki / Yanai, Takeshi
Issue Date: 1-Apr-2012
Publisher: American Institute of Physics Inc.
Citation: Journal of Applied Physics, 111(7), 07A733; 2012
Abstract: The method of enhancing coercivity of isotropic Nd-Fe-B flakes using simultaneous diffusion of Dy and crystallization from the amorphous state was also applied to Nd-Fe-B powders, in this study. Metal Dy coating was synthesized on amorphous Nd 2.36Fe 14B 1.05 powders by the vapor deposition method, and the powders were crystallized by a flash annealing. Simultaneous diffusion of Dy from their surfaces using the crystallization enhanced the coercivity of isotropic Nd-Fe-B powders. The coercivity H c increased and the remanence M r decreased nearly linearly with the amount of Dy, and the coating of 4.5 wt. Dy resulted in 25.3 increase in H c and 6.5% decrease in M r. The decrease in M r of the Nd-Fe-B powders is nearly the same in magnitude to that previously reported for Nd 2.36Fe 14B 1.05 flakes, which suggests that the method of Dy diffusion using crystallization from amorphous state is applicable to Nd-Fe-B amorphous powders as well as flakes. The energy-dispersive X-ray spectroscopy revealed that Dy coating is inhomogeneous, and a further enhancement in H c is expected by improving the coating method.
Keywords: Amorphous powders / Amorphous state / Coating methods / Energy dispersive x-ray spectroscopy / Flash annealing / Nd-Fe-B / Nd-Fe-B powder / Vapor deposition method / Coatings / Coercive force / Diffusion / Energy dispersive spectroscopy / Neodymium alloys / Powder metals / Neodymium
URI: http://hdl.handle.net/10069/30203
ISSN: 00218979
DOI: 10.1063/1.3679422
Rights: © 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 111 (7), art. no. 07A733; 2012 and may be found at http://link.aip.org/link/doi/10.1063/1.3679422.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/30203

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