Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering

K. Suresh; T. Ohkubo; Y. K. Takahashi; K. Oh-ishi; R. Gopalan; K. Hono; T. Nishiuchi; N. Nozawa; S. Hirosawa

doi:10.1016/j.jmmm.2009.07.010

Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering

K. Suresh, T. Ohkubo, Y. K. Takahashi, K. Oh-ishi, R. Gopalan, K. Hono^*, T. Nishiuchi, N. Nozawa, S. Hirosawa

^*Corresponding author for this work

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

23 Citations (Scopus)

Abstract

We have successfully consolidated hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-Zr-B-Ga powder by spark plasma sintering (SPS). The field compacted samples were sintered at different temperatures (T_S) from 550 to 600 °C with compressive pressure of 80 MPa for 20 min. Microstructural investigations by transmission electron microscopy indicated that the sintered specimen exhibits Nd₂Fe₁₄B grains of ~300 nm with Nd-rich grain boundary phase. The optimum magnetic properties of B_r: 1.22 T, H_c: 928 kA/m, _BH_c: 600 kA/m, (BH)_max: 210 kJ/m³ were obtained in the sample sintered at 550 °C. The strategy for further improving the coercivity and remanence is discussed based on the microstructure-property relationships.

Original language	English
Pages (from-to)	3681-3686
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	22
DOIs	https://doi.org/10.1016/j.jmmm.2009.07.010
Publication status	Published - 2009 Nov
Externally published	Yes

Keywords

Coercivity
HDDR
Nd-Fe-B
Permanent magnet
Spark plasma sintering

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2009.07.010

Cite this

@article{6111fc4525454ada9fd6816b465ccb83,

title = "Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering",

abstract = "We have successfully consolidated hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-Zr-B-Ga powder by spark plasma sintering (SPS). The field compacted samples were sintered at different temperatures (TS) from 550 to 600 °C with compressive pressure of 80 MPa for 20 min. Microstructural investigations by transmission electron microscopy indicated that the sintered specimen exhibits Nd2Fe14B grains of ~300 nm with Nd-rich grain boundary phase. The optimum magnetic properties of Br: 1.22 T, Hc: 928 kA/m, BHc: 600 kA/m, (BH)max: 210 kJ/m3 were obtained in the sample sintered at 550 °C. The strategy for further improving the coercivity and remanence is discussed based on the microstructure-property relationships.",

keywords = "Coercivity, HDDR, Nd-Fe-B, Permanent magnet, Spark plasma sintering",

author = "K. Suresh and T. Ohkubo and Takahashi, {Y. K.} and K. Oh-ishi and R. Gopalan and K. Hono and T. Nishiuchi and N. Nozawa and S. Hirosawa",

year = "2009",

month = nov,

doi = "10.1016/j.jmmm.2009.07.010",

language = "English",

volume = "321",

pages = "3681--3686",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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TY - JOUR

T1 - Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering

AU - Suresh, K.

AU - Ohkubo, T.

AU - Takahashi, Y. K.

AU - Oh-ishi, K.

AU - Gopalan, R.

AU - Hono, K.

AU - Nishiuchi, T.

AU - Nozawa, N.

AU - Hirosawa, S.

PY - 2009/11

Y1 - 2009/11

N2 - We have successfully consolidated hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-Zr-B-Ga powder by spark plasma sintering (SPS). The field compacted samples were sintered at different temperatures (TS) from 550 to 600 °C with compressive pressure of 80 MPa for 20 min. Microstructural investigations by transmission electron microscopy indicated that the sintered specimen exhibits Nd2Fe14B grains of ~300 nm with Nd-rich grain boundary phase. The optimum magnetic properties of Br: 1.22 T, Hc: 928 kA/m, BHc: 600 kA/m, (BH)max: 210 kJ/m3 were obtained in the sample sintered at 550 °C. The strategy for further improving the coercivity and remanence is discussed based on the microstructure-property relationships.

AB - We have successfully consolidated hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-Zr-B-Ga powder by spark plasma sintering (SPS). The field compacted samples were sintered at different temperatures (TS) from 550 to 600 °C with compressive pressure of 80 MPa for 20 min. Microstructural investigations by transmission electron microscopy indicated that the sintered specimen exhibits Nd2Fe14B grains of ~300 nm with Nd-rich grain boundary phase. The optimum magnetic properties of Br: 1.22 T, Hc: 928 kA/m, BHc: 600 kA/m, (BH)max: 210 kJ/m3 were obtained in the sample sintered at 550 °C. The strategy for further improving the coercivity and remanence is discussed based on the microstructure-property relationships.

KW - Coercivity

KW - HDDR

KW - Nd-Fe-B

KW - Permanent magnet

KW - Spark plasma sintering

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U2 - 10.1016/j.jmmm.2009.07.010

DO - 10.1016/j.jmmm.2009.07.010

M3 - Article

AN - SCOPUS:69549106001

SN - 0304-8853

VL - 321

SP - 3681

EP - 3686

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 22

ER -

Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering

Abstract

Keywords

ASJC Scopus subject areas

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