Squareness factors of demagnetization curves for multi-main-phase Nd-Ce-Fe-B magnets with different Ce contents

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:487

Article

Zhang, Yujing^1,2  Ma, Tianyu²  Yan, Mi²  Jin, Jiaying²  Liu, Xiaolian²  Xu, Feng¹  Miao, Xuefei¹  Liu, Chuyang² 

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Zhejiang Univ, Key Lab Novel Mat Informat Technol Zhejiang Prov, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China

关键词: Permanent magnet;    Nd-Ce-Fe-B;    Microstructure;    Squareness;    Coercivity;   

DOI  :  10.1016/j.jmmm.2019.165355

来源: Elsevier

【 摘 要 】

Multi-main-phase (MMP) magnets prepared by co-sintering Nd2Fe14B and (Nd,Ce)(2)Fe14B powders have shown better magnetic properties than the single-main-phase (SMP) magnets with the same average composition, enabling the preparation of high cost-performance permanent magnets with high Ce content. The present work focuses on the squareness factor (Q) of demagnetization curve for MMP Nd-Ce-Fe-B magnets, which represents the magnetic stability in practical applications. It is found that the MMP magnets prepared with larger fraction of (Nd,Ce)(2)Fe14B components possess higher Q value than those with lower fraction, which highlights the importance of relative fraction between the magnetically softer Ce-rich and the magnetically harder Nd-rich 2:14:1 grains on the squareness for the MMP magnets. Besides, the reduced Ce/Nd gradients within 2:14:1 grains and the formation of continuous RE-rich (RE, rare earth) grain boundaries also make contributions to the recovered squareness factor as well as the sustained coercivity.

【 授权许可】

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