Abstract
The research on the mixed rare earth-iron based permanent magnet compounds by doping rare earth elements in Nd-Fe-B or Pr-Fe-B permanent magnet has been a hot topic in recent years. In this paper, La doped Pr-Fe-B ((LaxPr1-x)3Fe14B, x=0, 0.3, 0.6, (La, Pr)-Fe-B) ribbons were prepared by vacuum arc melting technique and subsequently melt-spinning method at the optimal quenching speed. The microstructure, phase distribution and magnetic properties of the nanocomposite magnets were investigated. It is found that the samples present 2:14:1 main phase, La2O3 phase and minor α-Fe phase. No excess amorphous phase is observed, indicating that 20 m/s is an optimization of preparation condition to fabricate the (La, Pr)-Fe-B ribbons in this work. The EBSD results reveal that La-rich phases distribute mostly over the grain boundary. The substitution of La for Pr in Pr-Fe-B has some influence on the coercivity, but little on the saturation magnetization. This is thought to be related with the agglomeration of rare earth-rich intermetallic phase. We hope that this work can provide new ideas in the exploration of mixed rare earth-iron based permanent magnet compounds, which possess a cost advantage and a promising potential for practical applications.
Highlights
Since Nd2Fe14B (Nd-Fe-B) and Pr2Fe14B (Pr-Fe-B) magnets were found to possess outstanding intrinsic properties and be as a promising candidate for permanent magnets in the 1980s, many research works have been carried out focusing on the intrinsic properties of the iron based permanent magnets with 2:14:1 structure, such as microstructure, coercivity (Hc), remanent magnetization (Br), saturation magnetization and so on,1–3 and great progress has been achieved.4,5 Nowadays Nd-Fe-B and Pr-Fe-B based permanent magnets are playing an important role in people’s daily life and industry owing to the growing world’s energy demands.6,7lots of problems arose as well
It is found that the samples present 2:14:1 main phase, La2O3 phase and minor α-Fe phase
We hope that this work can provide new ideas in the exploration of mixed rare earth-iron based permanent magnet compounds, which possess a cost advantage and a promising potential for practical applications
Summary
Since Nd2Fe14B (Nd-Fe-B) and Pr2Fe14B (Pr-Fe-B) magnets were found to possess outstanding intrinsic properties and be as a promising candidate for permanent magnets in the 1980s, many research works have been carried out focusing on the intrinsic properties of the iron based permanent magnets with 2:14:1 structure, such as microstructure, coercivity (Hc), remanent magnetization (Br), saturation magnetization and so on, and great progress has been achieved. Nowadays Nd-Fe-B and Pr-Fe-B based permanent magnets are playing an important role in people’s daily life and industry owing to the growing world’s energy demands.6,7lots of problems arose as well. The exhaustive exploitation and high costs of neodymium (Nd) and praseodymium (Pr) metal has led to an ongoing concern regarding the future supply of Nd and Pr. Much effort has been devoted to looking for other lowcost alternatives that have the same excellent magnetic performance. Many researches are focused on doping La, Ce or mischmetal into Nd-Fe-B or Pr-Fe-B iron based permanent magnets to prepare the alternative magnets containing less Nd/Pr while maintaining excellent performance, which is, namely, mixed rare earth (RE)-iron based permanent magnet compounds.. The effects scitation.org/journal/adv of elements doping on the magnetic properties of mixed RE-iron based permanent magnet compounds are well studied, especially in Ce-doped permanent magnets.. The mixed RE-iron based permanent magnet compound is believed to be a potential material to meet the urgent demand for low-cost magnet in terms of economy Many researches are focused on doping La, Ce or mischmetal into Nd-Fe-B or Pr-Fe-B iron based permanent magnets to prepare the alternative magnets containing less Nd/Pr while maintaining excellent performance, which is, namely, mixed rare earth (RE)-iron based permanent magnet compounds. The effects scitation.org/journal/adv of elements doping on the magnetic properties of mixed RE-iron based permanent magnet compounds are well studied, especially in Ce-doped permanent magnets. The mixed RE-iron based permanent magnet compound is believed to be a potential material to meet the urgent demand for low-cost magnet in terms of economy
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