Effect of sintering conditions on the magnetic and microstructural properties of Nd-Fe-B sintered magnets doped with DyF 3 powders

Song E. Park; Tae Hoon Kim; Seong Rae Lee; Seok Namkung; Tae Suk Jang

doi:10.1063/1.3672246

Effect of sintering conditions on the magnetic and microstructural properties of Nd-Fe-B sintered magnets doped with DyF ₃ powders

Song E. Park, Tae Hoon Kim, Seong Rae Lee, Seok Namkung, Tae Suk Jang

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The microstructural and magnetic property changes of DyF ₃-doped (Nd _26.06, Dy _6.51)-Fe _bal -B _0.97- M _2.39 (wt.%) (M Cu, Al, Co, and Nb) sintered magnets as functions of the sintering conditions were studied. The sintering conditions for the optimum core-shell microstructure were determined. When the magnets were sintered at 1050°C for 4 h, a coercivity of 35.1 kOe was obtained without sacrificing the remanence. When the magnets were doped with DyF ₃, the formation of the RE-rich phase (Nd-Dy-O) was effectively suppressed and, hence, saving the Dy. In addition, the formation of a cubic-NdOF triple-junction phase (TJP) improves the interface uniformity and enhances the coercivity.

Original language	English
Article number	07A707
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3672246
Publication status	Published - 2012 Apr 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Effect of sintering conditions on the magnetic and microstructural properties of Nd-Fe-B sintered magnets doped with DyF 3 powders",

abstract = "The microstructural and magnetic property changes of DyF 3-doped (Nd 26.06, Dy 6.51)-Fe bal -B 0.97- M 2.39 (wt.%) (M Cu, Al, Co, and Nb) sintered magnets as functions of the sintering conditions were studied. The sintering conditions for the optimum core-shell microstructure were determined. When the magnets were sintered at 1050°C for 4 h, a coercivity of 35.1 kOe was obtained without sacrificing the remanence. When the magnets were doped with DyF 3, the formation of the RE-rich phase (Nd-Dy-O) was effectively suppressed and, hence, saving the Dy. In addition, the formation of a cubic-NdOF triple-junction phase (TJP) improves the interface uniformity and enhances the coercivity.",

author = "Park, {Song E.} and Kim, {Tae Hoon} and Lee, {Seong Rae} and Seok Namkung and Jang, {Tae Suk}",

note = "Funding Information: This research is supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Commerce, Industry and Energy and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-007200), Republic of Korea. Copyright: Copyright 2012 Elsevier B.V., All rights reserved.",

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AU - Park, Song E.

AU - Kim, Tae Hoon

AU - Lee, Seong Rae

AU - Namkung, Seok

AU - Jang, Tae Suk

N1 - Funding Information: This research is supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Commerce, Industry and Energy and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-007200), Republic of Korea. Copyright: Copyright 2012 Elsevier B.V., All rights reserved.

PY - 2012/4/1

Y1 - 2012/4/1

N2 - The microstructural and magnetic property changes of DyF 3-doped (Nd 26.06, Dy 6.51)-Fe bal -B 0.97- M 2.39 (wt.%) (M Cu, Al, Co, and Nb) sintered magnets as functions of the sintering conditions were studied. The sintering conditions for the optimum core-shell microstructure were determined. When the magnets were sintered at 1050°C for 4 h, a coercivity of 35.1 kOe was obtained without sacrificing the remanence. When the magnets were doped with DyF 3, the formation of the RE-rich phase (Nd-Dy-O) was effectively suppressed and, hence, saving the Dy. In addition, the formation of a cubic-NdOF triple-junction phase (TJP) improves the interface uniformity and enhances the coercivity.

AB - The microstructural and magnetic property changes of DyF 3-doped (Nd 26.06, Dy 6.51)-Fe bal -B 0.97- M 2.39 (wt.%) (M Cu, Al, Co, and Nb) sintered magnets as functions of the sintering conditions were studied. The sintering conditions for the optimum core-shell microstructure were determined. When the magnets were sintered at 1050°C for 4 h, a coercivity of 35.1 kOe was obtained without sacrificing the remanence. When the magnets were doped with DyF 3, the formation of the RE-rich phase (Nd-Dy-O) was effectively suppressed and, hence, saving the Dy. In addition, the formation of a cubic-NdOF triple-junction phase (TJP) improves the interface uniformity and enhances the coercivity.

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