Abstract
Hard magnetic Sm2Fe17Nx alloy powders with a coercivity of 5.6 kA/cm and a remanent polarization of 1 T, related to the density of 7.7 g/cm3, could be achieved by a combined heat treatment in hydrogen atmosphere and a successive nitrogenation. During nitrogenation SmFe3 and SmFe2 constituents decompose into SmN and αFe immediately. The density of die-pressed anisotropic Sm2Fe17Nx magnets containing 5 wt % Zn amounts to ∼5 g/cm3 and increases to 5.25 g/cm3 for additions of 20 wt % Zn. After annealing at 390 °C for 10 h, the remanent polarization of 0.66 T and the coercivity of 8.8 kA/cm result in a maximal energy density of 67 kJ/m3. Annealing at temperatures of ∼420 °C achieves additional αFe due to a decomposition of Sm2Fe17Nx by Zn: Sm2Fe17Nx+Zn→Sm2FeZn2+αFe+N2. Additions of 10 wt % Sn result in a density of 4.6 g/cm3 of isostatically compacted magnets. The remanent polarization amounts to ∼0.6 T, but the coercivity Hcj of ∼4 kA/cm is inferior to Zn-bonded Sm2Fe17Nx magnets.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
