ホーム > 研究活動 > 口頭発表(2018) > Preparation of high performance Sm-Fe-N bulk magnets

研究活動

Preparation of high performance Sm-Fe-N bulk magnets

NIMS-WEEK 2018

2018年10月15日(月)

Masashi Matsuura, Yuki Nishijima, Nobuki Tezuka, Satoshi Sugimoto (Tohoku University)Tetsuya Shoji, Noritsugu Sakuma (Toyota Motor Corp.)

Abstract

To obtain high performance Zn-bonded Sm-Fe-N bulk magnets, it is required to achievefollowing conditions; decreasing oxygen content in magnets, decreasing Zn content with welldispersibility, and increasing relative density. In this study, we adopted two processes; (i)preparing fine and low oxygen Zn powder, (ii) preparing low-oxygen Sm-Fe-N powder, applyingthe Arc-Plasma-Deposition (APD) for Zn deposition on the Sm-Fe-N powder and Sparkplasma sintering (SPS) for increasing relative density of bulk magnets.by the Hydrogen-Plasma-Metal-Reaction (HPMR) method. The Zn-bonded Sm-Fe-N magnetsprepared using HPMR-Zn powder showed high coercivity of 2.66 MA/m (15 wt% Zn) and 2.41MA/m (10 wt% Zn)[1].Second, low-oxygen Sm-Fe-N powder was prepared, and well dispersed and low-oxygen Znwas deposited on the Sm-Fe-N powders by the APD. The APDed Sm-Fe-N/Zn compositepowders were sintered by Spark plasma sintering (SPS), and 3.3 wt% Zn-bonded Sm-Fe-Nmagnet showed high (BH)max of 153 kJ/m3 with relatively high coercivity of 1.14 MA/m. Inaddition, we successfully obtained Zn-free low oxygen Sm-Fe-N magnet showing high(BH)max of 179 kJ/m3 [2].

その他特記事項

This work was partially supported by MagHEM commissioned byNEDO and ESICMM commissioned by the MEXT


研究活動

文部科学省

文部科学省
元素戦略プロジェクト(活動紹介)
NIMS磁石パートナーシップ

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合