Preparation of Anisotropic Sm2Fe17NX Magnetic Materials by Strip Casting Technique

Strip casting technique was used to prepare anisotropic Sm2Fe17NX compounds. It was found that single phase Sm2Fe17 compound could be obtained by this technique without postannealing treatment. The microstructure studies of the Sm2Fe17 strips showed that not only the grain size in the strips was small, but also the size distribution of the grains was narrow as compared to those of conventionally cast ingots. Single phase Sm2Fe17Nx interstitial compounds and anisotropic Sm2Fe17NX magnetic powders with B-r = 1.42 T, H-i(e) = 12.5 kOe and (BH)(max) = 316 kJ/m(3) (39.5 MGOe) could be obtained by optimizing the nitrogenation process. The magnetic hardening mechanism of the anisotropic powders is mainly controlled by the domain nucleation.Engineering, Electrical & ElectronicPhysics, AppliedSCI(E)EI2ARTICLE73248-32504