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Improved magnetic properties and optimized preparation process of (MM)–Fe–B magnets

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Abstract

Substitution of Nd element with misch metal (MM) element in the RE–Fe–B magnets has been set off as an effective method to decrease the cost of RE–Fe–B materials and ensure a more balanced utilization of rare-earth elements. In the present work, the composition of MMxFe94−xB6 (x = 14 and 16) alloys are fabricated by the melt-spinning method with wheel speeds of 20 and 25 m s−1, respectively. It is demonstrated that with increasing wheel speed and MM content, can effectively suppress the formation of α-Fe soft phase and refine grain size. The maximum energy product (BH)max of 10.03 MGOe is obtained for the MM16-V25 alloy, which is a result of its higher intrinsic coercivity Hcj (Hcj: 9.15 kOe) and squareness Hk/Hcj (Hk/Hcj: 0.49). Meanwhile, the analysis of Henkel plots δM(H) and microstructure show that the MM16-V25 alloy obtains the strongest exchange coupling effect and more uniform microstructure with fine grain size. In addition, the compositions of 2:14:1 grain and grain boundary from energy dispersive spectroscopy for the MM16-V25 alloy are also discussed in detail.

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Acknowledgements

This work is supported by the National Key R&D Program of China (no. 2022YFB3504800), the National Natural Science Foundation of China (no. 52271191), the Special Support Plan for High Level Talents of Zhejiang Province (no. 2022R52005), the Key R&D Program of Zhejiang Province (nos. 2021C01190 and 2021C01191) and the Key R&D Program of Ningbo City (no. 2021Z093).

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Authors and Affiliations

  1. Magnetism Key Laboratory of Zhejiang Province, China Jiliang University, Hangzhou, 310018, People’s Republic of China

    Qiong Wu, Hangfu Yang, Nengjun Yu, Minxiang Pan & Hongliang Ge

  2. The 9th Research Institute of China, Electronics Technology Group Corporation, Mianyang, 621000, People’s Republic of China

    Cong Xian

  3. BGRIMM Magnetic Materials and Technology Co. Ltd., Beijing, 102600, People’s Republic of China

    Pengjie Zhang

  4. Dongyang Dingfeng Magnetics Co. Ltd., Jinhua, 322100, People’s Republic of China

    Liang Chen

  5. Zhejiang Fashion Institute of Technology, Ningbo, 315000, People’s Republic of China

    Hongwu Ye

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  1. Qiong Wu
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  2. Hangfu Yang
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  4. Minxiang Pan
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  9. Hongliang Ge
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Correspondence to Minxiang Pan.

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Wu, Q., Yang, H., Yu, N. et al. Improved magnetic properties and optimized preparation process of (MM)–Fe–B magnets. Bull Mater Sci 47, 5 (2024). https://doi.org/10.1007/s12034-023-03090-3

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