Production of anisotropic Sm-Fe-N magnet sheets by modified powder rolling

We developed a modified powder rolling technique wherein encapsulating Sm-Fe-N powders inside metallic sheaths made it possible to consolidate the aligned monocrystalline Sm-Fe-N fine particles into a form of sheet at elevated temperatures under nitrogen atmosphere. No bonding medium was used in this method. This paper demonstrates the successful cases of production of anisotropic Sm-Fe-N magnets by this new technique. In a good case, the Sm-Fe-N magnet sheet exhibited a maximum energy product of 123 kJ/m(3) which is comparable with the reported highest values in the literature but still not strong as practical permanent magnets. A possible strategy to improve magnet performance further is briefly discussed. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A modified powder rolling technique was developed to consolidate aligned monocrystalline Sm-Fe-N fine particles into magnet sheets. The magnet sheets exhibited a maximum energy product of 123 kJ/m(3), comparable with reported values but still not as strong as practical permanent magnets. Possible strategies to further improve magnet performance were briefly discussed.