水素処理したSm-Fe-N系粉末の磁気特性

抄録

The hard magnetic properties of newly developedi intermetalic compound Sm₂Fe₁₇N_x are enough high to become permanent magnet materials with their high saturation magnetization, a large uniaxial anisotropy and high Curie temperature.
High magnetic properties of (BH)_max=240kJ/m³, Br=1.27T and H_cj=916kA/m were obtained as fine powder shape, which is preferable shape for raw materials of resin or metal bonded magnets. These magnetic properties promised (BH)_max=160kJ/m³ as bonded magnets applying standard technique for a fabrication of anisotropic bonded magnets.
Compositions, phase analysis and nitrogenation condition have been investigated. Single phase is necessary for high magnetic properties. Three main factors in process are as follows: composition of close to Sm₂Fe₁₇N_x stoichiomerty, hydrogen treatment before nitrogenation, lower temperature and longer time condition for nitrogenation