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Chin. Phys. B, 2020, Vol. 29(10): 107504    DOI: 10.1088/1674-1056/abb3f7

High performance RE–Fe–B sintered magnets with high-content misch metal by double main phase process

Yan-Li Liu(刘艳丽)1,2,3, Qiang Ma(马强)1,2, Xin Wang(王鑫)2, Jian-Jun Zhou(周建军)2, Tong-Yun Zhao(赵同云)1,3, Feng-Xia Hu(胡凤霞)1,3, Ji-Rong Sun(孙继荣)1,3, and Bao-Gen Shen(沈保根)1,3,
1 State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China
3 University of Chinese Academy of Sciences, Beijing 100049, China

Double main phase process is applied to fabricate [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 (x = 0.5 and 0.7; M = Cu, Al, Co, and Nb) sintered magnets with high misch metal (MM) content. In comparison to the magnets by single main phase process, the enhanced magnetic properties have been achieved. For magnets of x = 0.7, Hcj increases to 371.9 kA/m by 60.5%, and (BH)max is significantly enhanced to 253.3 kJ/m3 by 56.9%, compared with those of the single main phase magnets of the same nominal composition. In combination with minor loops and magnetic recoil curves, the property improvement of magnets with double main phase method is well explained. As a result, it is demonstrated that double main phase technology is an effective approach to improve the permanent magnetic properties of MM based sintered magnets.

Keywords:  misch metal      double main phase process      magnetic properties      coercivity  
Received:  21 August 2020      Revised:  26 August 2020      Accepted manuscript online:  01 September 2020
PACS:  75.47.Np (Metals and alloys)  
  75.50.Ww (Permanent magnets)  
  75.60.Jk (Magnetization reversal mechanisms)  
Corresponding Authors:  Corresponding author. E-mail:   
About author: 
†Corresponding author. E-mail:
* Project supported by the National Natural Foundation of China (Grant Nos. 51590880, 11564030, and 51571126), the National Key Research Program of China (Grant No. 2016YFB0700903), Fujian Institute of Innovation, Chinese Academy of Sciences (Grant No. FJCXY18040302), the Key Program of the Chinese Academy of Sciences (Grant No. KJZD-EW-M05-1), the Inner Mongolia Science and Technology Major Project of 2016, China, and the Natural Science Foundation of Inner Mongolia, China (Grant Nos. 2018LH05006 and 2018LH05011).

Cite this article: 

Yan-Li Liu(刘艳丽), Qiang Ma(马强), Xin Wang(王鑫), Jian-Jun Zhou(周建军), Tong-Yun Zhao(赵同云), Feng-Xia Hu(胡凤霞), Ji-Rong Sun(孙继荣), and Bao-Gen Shen(沈保根)† High performance RE–Fe–B sintered magnets with high-content misch metal by double main phase process 2020 Chin. Phys. B 29 107504

Fig. 1.  

(a) The room-temperature demagnetization curves of the [(Pr, Nd)1 – xMMx]13.8 FebalM1.5B5.9 (x = 0.0, 0.5, 0.7, and 1.0) magnets. (b) XRD patterns of the sintered magnet prepared by SMP or DMP process.

Fig. 2.  

The comparison of (BH)max for MM based RE–Fe–B sintered magnets. The solid and hollow symbols are corresponding to SMP and DMP processes, respectively.

Fig. 3.  

Temperature dependence of σm and d σm / d T in the range of 300–700 K for [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 (x = 0.5 and 0.7) magnets prepared by DMP process.

Fig. 4.  

The back-scattered images of [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 magnets: (a) x = 0.5 with SMP, (b) x = 0.5 with DMP, (c) x = 0.7 with SMP, and (d) x = 0.7 with DMP process.

Fig. 5.  

(a) Back-scattered electron image and (b)–(f) the corresponding EDX mappings of La, Ce, Fe, Pr, and Nd for [(Pr, Nd)0.3MM0.7]13.8FebalM1.5B5.9 magnets with SMP process.

Fig. 6.  

(a) Back-scattered electron image and (b)–(f) the corresponding EPMA mappings of La, Ce, Fe, Pr, and Nd for [(Pr, Nd)0.3MM0.7]13.8FebalM1.5B5.9 DMP magnets.

Fig. 7.  

The dependence of M, Mr, and Hcj of minor loops of [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 magnets on H/Hcj for (a) x = 0.5 and (b) x = 0.7, the insets show the minor loops.

Fig. 8.  

The recoil loops for [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 (x = 0.5 and 0.7) magnets with SMP and DMP processes, respectively.

Fig. 9.  

(a) The recoil loops for [(Pr, Nd)0.5MM0.5]13.8FebalM1.5B5.9 DMP magnets, (b) the dependence of χrev/σs on the applied magnetic field H deduced from the recoil loops for [(Pr, Nd)1 – xMMx]13.8FebalM1.5B5.9 (x = 0.5 and 0.7) magnets with SMP and DMP processes, respectively.

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