Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm2Co17 permanent magnets

doi:10.1088/1674-1056/ad5537

中国物理B ›› 2024, Vol. 33 ›› Issue (9): 98103-098103.doi: 10.1088/1674-1056/ad5537

Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm₂Co₁₇ permanent magnets

Da-Shuai Xu(许大帅)^1,2, Lei Liu(刘雷)^2,3,†, Jian-Hui Yuan(袁建辉)^1,‡, Bo Zhou(周波)², Chuang-Hui Dong(董创辉)², Feng-Qing Wang(王凤青)^2,3, Yong Ding(丁勇)^2,3, Ying-Li Sun(孙颖莉)^2,3, and A-Ru Yan(闫阿儒)^2,3

1 School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2 CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, CAS Key Laboratory of Magnetic Materials and Devices, Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2024-04-04 修回日期:2024-05-16 接受日期:2024-06-07 发布日期:2024-08-15
通讯作者: Lei Liu, Jian-Hui Yuan E-mail:liulei@nimte.ac.cn;yuanjh@sues.edu.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant No. 2021YFB3803003), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2023311), Zhejiang Public Welfare Technology Application Research Project (Grant No. LGG22E010013), and Class III Peak Discipline of Shanghai-Materials Science and Engineering (High-Energy Beam Intelligent Processing and Green Manufacturing).

Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm₂Co₁₇ permanent magnets

1 School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2 CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, CAS Key Laboratory of Magnetic Materials and Devices, Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2024-04-04 Revised:2024-05-16 Accepted:2024-06-07 Published:2024-08-15
Contact: Lei Liu, Jian-Hui Yuan E-mail:liulei@nimte.ac.cn;yuanjh@sues.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant No. 2021YFB3803003), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2023311), Zhejiang Public Welfare Technology Application Research Project (Grant No. LGG22E010013), and Class III Peak Discipline of Shanghai-Materials Science and Engineering (High-Energy Beam Intelligent Processing and Green Manufacturing).

摘要/Abstract

摘要： This study investigated the effect of antioxidants on the grinding efficiency, magnetic powder characteristics, microstructure, and magnetic properties of 2:17 type SmCo permanent magnet materials. The results show that adding antioxidants helps improve the dispersion among magnetic powders, leading to a 33.3% decrease in jet milling time and a 15.8% increase in magnet powder production yield. Additionally, adding antioxidants enhances the oxidation resistance of the magnetic powders. After being stored in a constant temperature air environment at 25 ${^\circ}$C for 48 h, the O content in the powder decreased by 33% compared to samples without antioxidants. While in the magnet body, the O content decreased from 0.21 wt.% to 0.14 wt.%, which helps increase the effective Sm content and domain wall pinning uniformity in the magnet. Excellent magnetic properties were obtained in the magnet with added antioxidants: $B_{\rm r} = 11.6$ kGs, ${\rm SF} = 79.6 $%, $H_{\rm cj} = 16.8$ kOe, and $(BH)_{\max} = 32.5 $ MGOe.

关键词: antioxidant, SmCo permanent magnet, oxidation resistance, grinding efficiency

Abstract: This study investigated the effect of antioxidants on the grinding efficiency, magnetic powder characteristics, microstructure, and magnetic properties of 2:17 type SmCo permanent magnet materials. The results show that adding antioxidants helps improve the dispersion among magnetic powders, leading to a 33.3% decrease in jet milling time and a 15.8% increase in magnet powder production yield. Additionally, adding antioxidants enhances the oxidation resistance of the magnetic powders. After being stored in a constant temperature air environment at 25 ${^\circ}$C for 48 h, the O content in the powder decreased by 33% compared to samples without antioxidants. While in the magnet body, the O content decreased from 0.21 wt.% to 0.14 wt.%, which helps increase the effective Sm content and domain wall pinning uniformity in the magnet. Excellent magnetic properties were obtained in the magnet with added antioxidants: $B_{\rm r} = 11.6$ kGs, ${\rm SF} = 79.6 $%, $H_{\rm cj} = 16.8$ kOe, and $(BH)_{\max} = 32.5 $ MGOe.

Key words: antioxidant, SmCo permanent magnet, oxidation resistance, grinding efficiency

中图分类号: (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)

81.20.Ev

75.50.Ww (Permanent magnets) 81.16.Pr (Micro- and nano-oxidation) 81.40.-z (Treatment of materials and its effects on microstructure, nanostructure, And properties)

Da-Shuai Xu(许大帅), Lei Liu(刘雷), Jian-Hui Yuan(袁建辉), Bo Zhou(周波), Chuang-Hui Dong(董创辉), Feng-Qing Wang(王凤青), Yong Ding(丁勇), Ying-Li Sun(孙颖莉), and A-Ru Yan(闫阿儒). Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm₂Co₁₇ permanent magnets[J]. 中国物理B, 2024, 33(9): 98103-098103.

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Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm₂Co₁₇ permanent magnets

Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm₂Co₁₇ permanent magnets

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