Abstract：Sm2Fe17N3 magnetic powder with high coercivity was prepared by strip casting followed by nitriding. The effects of nitriding process on the magnetic properties were studied. The results show that the Sm2Fe17N3 powder obtained by nitriding at 773K for 24h followed by slow cooling exhibits the best properties with remanent polarization Jr=0.94T, intrinsic coercivity Hcj = 698 kA/m and maximum energy product (BH)max = 16.27MGOe. Compared to Nd-Fe-B magnets, Sm-Fe-N powder also show higher elevated temperature properties and better thermal stability. The bonded magnets were also fabricated based on optimized powder. The effects of powder size on the magnetic properties of Sm2Fe17N3 bonded magnets were studied. It is found that the magnet with uniform particle size distribution has relatively higher density and better hard magnetic properties. The magnet with average particle size of 67 μm shows (BH)max = 9.52 MGOe.
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