Increase of energy products of Zn-bonded Sm-Fe-N magnets with low oxygen content

Masashi Matsuura; Yuki Nishijima; Nobuki Tezuka; Satoshi Sugimoto; Tetsuya Shoji; Noritsugu Sakuma

doi:10.1016/j.jmmm.2018.07.064

Increase of energy products of Zn-bonded Sm-Fe-N magnets with low oxygen content

Masashi Matsuura, Yuki Nishijima, Nobuki Tezuka, Satoshi Sugimoto, Tetsuya Shoji, Noritsugu Sakuma

ENG - Materials Science

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

8 Citations (Scopus)

Abstract

To increase the maximum energy product, (BH)_max, of Zn-bonded Sm-Fe-N magnets, a process for preparing a Sm-Fe-N powder with a low oxygen content was developed. The Sm-Fe-N powder containing 0.23 wt% oxygen was prepared by ball milling and nitriding, and the powder remanence and coercivity were 140 A·m²kg⁻¹ and 0.72 MA·m⁻¹, respectively. Arc plasma deposition (APD) was used for Zn addition. Fine Zn particles several tens of nanometers in size were deposited on the Sm-Fe-N powder under vacuum conditions, and APD prevented the oxygen content increasing in the Zn-deposited Sm-Fe-N powder. The low-oxygen Sm-Fe-N powder was pressed and sintered by spark plasma sintering (SPS), and 3.3 wt% Zn-bonded and Zn-free Sm-Fe-N magnets were prepared. For both Zn-bonded and Zn-free Sm-Fe-N magnets, the density increased with increasing sintering pressure, and the relative density of the Zn-bonded Sm-Fe-N magnet was 89% and that of the Zn-free Sm-Fe-N magnet was 85% after SPS. The coercivities of the Zn-bonded and Zn-free Sm-Fe-N magnets were both high at 1.1 and 0.8 MA·m⁻¹, respectively. (BH)_max of these magnets increased with increasing relative density, and the highest (BH)_max value of the Zn-bonded Sm-Fe-N magnets was 153 kJ·m⁻³ and that of the Zn-free Sm-Fe-N magnet was 179 kJ·m⁻³.

Original language	English
Pages (from-to)	64-68
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	467
DOIs	https://doi.org/10.1016/j.jmmm.2018.07.064
Publication status	Published - 2018 Dec 1

Keywords

Arc plasma deposition
Binder less
Maximum energy products
Oxygen content
Sm-Fe-N magnets
Spark plasma sintering
Zn binder

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Increase of energy products of Zn-bonded Sm-Fe-N magnets with low oxygen content",

abstract = "To increase the maximum energy product, (BH)max, of Zn-bonded Sm-Fe-N magnets, a process for preparing a Sm-Fe-N powder with a low oxygen content was developed. The Sm-Fe-N powder containing 0.23 wt% oxygen was prepared by ball milling and nitriding, and the powder remanence and coercivity were 140 A·m2kg−1 and 0.72 MA·m−1, respectively. Arc plasma deposition (APD) was used for Zn addition. Fine Zn particles several tens of nanometers in size were deposited on the Sm-Fe-N powder under vacuum conditions, and APD prevented the oxygen content increasing in the Zn-deposited Sm-Fe-N powder. The low-oxygen Sm-Fe-N powder was pressed and sintered by spark plasma sintering (SPS), and 3.3 wt% Zn-bonded and Zn-free Sm-Fe-N magnets were prepared. For both Zn-bonded and Zn-free Sm-Fe-N magnets, the density increased with increasing sintering pressure, and the relative density of the Zn-bonded Sm-Fe-N magnet was 89% and that of the Zn-free Sm-Fe-N magnet was 85% after SPS. The coercivities of the Zn-bonded and Zn-free Sm-Fe-N magnets were both high at 1.1 and 0.8 MA·m−1, respectively. (BH)max of these magnets increased with increasing relative density, and the highest (BH)max value of the Zn-bonded Sm-Fe-N magnets was 153 kJ·m−3 and that of the Zn-free Sm-Fe-N magnet was 179 kJ·m−3.",

keywords = "Arc plasma deposition, Binder less, Maximum energy products, Oxygen content, Sm-Fe-N magnets, Spark plasma sintering, Zn binder",

author = "Masashi Matsuura and Yuki Nishijima and Nobuki Tezuka and Satoshi Sugimoto and Tetsuya Shoji and Noritsugu Sakuma",

year = "2018",

month = dec,

day = "1",

doi = "10.1016/j.jmmm.2018.07.064",

language = "English",

volume = "467",

pages = "64--68",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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TY - JOUR

T1 - Increase of energy products of Zn-bonded Sm-Fe-N magnets with low oxygen content

AU - Matsuura, Masashi

AU - Nishijima, Yuki

AU - Tezuka, Nobuki

AU - Sugimoto, Satoshi

AU - Shoji, Tetsuya

AU - Sakuma, Noritsugu

PY - 2018/12/1

Y1 - 2018/12/1

N2 - To increase the maximum energy product, (BH)max, of Zn-bonded Sm-Fe-N magnets, a process for preparing a Sm-Fe-N powder with a low oxygen content was developed. The Sm-Fe-N powder containing 0.23 wt% oxygen was prepared by ball milling and nitriding, and the powder remanence and coercivity were 140 A·m2kg−1 and 0.72 MA·m−1, respectively. Arc plasma deposition (APD) was used for Zn addition. Fine Zn particles several tens of nanometers in size were deposited on the Sm-Fe-N powder under vacuum conditions, and APD prevented the oxygen content increasing in the Zn-deposited Sm-Fe-N powder. The low-oxygen Sm-Fe-N powder was pressed and sintered by spark plasma sintering (SPS), and 3.3 wt% Zn-bonded and Zn-free Sm-Fe-N magnets were prepared. For both Zn-bonded and Zn-free Sm-Fe-N magnets, the density increased with increasing sintering pressure, and the relative density of the Zn-bonded Sm-Fe-N magnet was 89% and that of the Zn-free Sm-Fe-N magnet was 85% after SPS. The coercivities of the Zn-bonded and Zn-free Sm-Fe-N magnets were both high at 1.1 and 0.8 MA·m−1, respectively. (BH)max of these magnets increased with increasing relative density, and the highest (BH)max value of the Zn-bonded Sm-Fe-N magnets was 153 kJ·m−3 and that of the Zn-free Sm-Fe-N magnet was 179 kJ·m−3.

AB - To increase the maximum energy product, (BH)max, of Zn-bonded Sm-Fe-N magnets, a process for preparing a Sm-Fe-N powder with a low oxygen content was developed. The Sm-Fe-N powder containing 0.23 wt% oxygen was prepared by ball milling and nitriding, and the powder remanence and coercivity were 140 A·m2kg−1 and 0.72 MA·m−1, respectively. Arc plasma deposition (APD) was used for Zn addition. Fine Zn particles several tens of nanometers in size were deposited on the Sm-Fe-N powder under vacuum conditions, and APD prevented the oxygen content increasing in the Zn-deposited Sm-Fe-N powder. The low-oxygen Sm-Fe-N powder was pressed and sintered by spark plasma sintering (SPS), and 3.3 wt% Zn-bonded and Zn-free Sm-Fe-N magnets were prepared. For both Zn-bonded and Zn-free Sm-Fe-N magnets, the density increased with increasing sintering pressure, and the relative density of the Zn-bonded Sm-Fe-N magnet was 89% and that of the Zn-free Sm-Fe-N magnet was 85% after SPS. The coercivities of the Zn-bonded and Zn-free Sm-Fe-N magnets were both high at 1.1 and 0.8 MA·m−1, respectively. (BH)max of these magnets increased with increasing relative density, and the highest (BH)max value of the Zn-bonded Sm-Fe-N magnets was 153 kJ·m−3 and that of the Zn-free Sm-Fe-N magnet was 179 kJ·m−3.

KW - Arc plasma deposition

KW - Binder less

KW - Maximum energy products

KW - Oxygen content

KW - Sm-Fe-N magnets

KW - Spark plasma sintering

KW - Zn binder

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U2 - 10.1016/j.jmmm.2018.07.064

DO - 10.1016/j.jmmm.2018.07.064

M3 - Article

AN - SCOPUS:85050354371

VL - 467

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EP - 68

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

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