NDLI: Coercivity and Thermal Stability Enhancement for Spark-Plasma-Sintered Nanocrystalline NdFeB Magnets With Dy<sub>2</sub>O<sub>3</sub> and Zn Additions

Content Provider	IEEE Xplore Digital Library
Author	Liu, Z.W. Zhao, L.Z. Hu, S.L. Yu, H.Y. Zhong, X.C. Gao, X.X.
Copyright Year	1965
Abstract	NdFeB bulk magnets were synthesized by spark plasma sintering (SPS) using the precursors of melt spun nanocrystalline Nd_10.15Pr_1.86Fe_80.41Al_1.67B_5.91 ribbons mixed with Zn and/or Dy₂O₃ powders. The addition of 0.6 wt.% Zn or 2 wt.% Dy₂O₃ is effective in improving the magnetic properties of the magnets, and their coercivities are about 11% or 15%, respectively, higher than that of the additive free magnet. Both additives can suppress the grain growth of Nd₂Fe₁₄B phase. Dy₂O₃ is not beneficial to the densification during SPS, but Dy is considered to partly diffuse into the grains near particle boundaries and to form (Nd, Dy)₂Fe₁₄B phase. NdZn and NdZn₅ phases were observed in the SPSed magnets with Zn additions more than 1 wt.%, which leads to coarse grains and porosities between the particles. The magnet with combined additions of 2 wt.% Dy₂O₃ and 0.6 wt.% Zn showed good thermal stability with small temperature coefficients and optimal magnetic properties with high coercivity and maximum energy product.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	4297158
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Perpendicular magnetic anisotropy Zinc Thermal stability Powders Coercive force Magnetic resonance imaging spark plasma sintering NdFeB magnets magnetic properties thermal stability Magnetic properties spark plasma sintering (SPS)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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