Magnetic Properties of TbCu_7-Type Sm-Fe-N Melt-Spun Ribbons

概要

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Effects of the preparation condition on magnetic properties were investigated in isotropic TbCu_7-type Sm-Zr-Fe-Co-N materials made by the melt-spinning process. All the Sm-Zr-Fe-Co powders melt-spun with wheel speeds of 30-40 m/s showed a single-phase structure with crystalline TbCu_7. The grain size of the powder decreased monotonically with the increase of the wheel speed. The H_<cJ>, B_r and (BH)_<max> of the powder increased with decreasing grain size. In this study, maximum hard magnetic property was achieved in Sm_<8.7>Zr_<1.0>Fe_<85.8>Co_<4.5>N_x powder melt-spun at 40 m/s. A compression-molded bonded magnet using powder melt-spun with at a wheel speed of 40 m/s showed excellent hard magnetic properties : B_r=0.83 T, H_<cJ>=720.5 kA/m, (BH)_<max>= 113.9 kJ/m^3. These results show that the TbCu_7-type Sm-Fe-N material has high performance and practicality for isotropic bonded magnets.
2004-11-01