高保磁力Didymium-Fe-Co-Nb-Y-B系急冷薄帯並びにそれらボンド磁石の磁気特性(ハード磁性材料)

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Melt-spun ribbons of Didymium-Fe-Co-Nb-Y-B system alloys were prepared by the single-roller liquid rapid-quenching method. The effects of Y addition, wheel velocity, and heat treatment on the magnetic properties were investigated. The optimum preparation conditions of the compounds were as follows: composition Didymium_<12.5>Fe_<69.8>Co_<10>Nb_1Y_<0.7>B_6; wheel velocity 20.0 m/s; heat treatment 650℃ for 10 min. Magnetic properties of this ribbon were (BH)_<max>=126.4 kJ/m^3 and H_<cJ>=1409.0 kA/m. The value of (BH)_<max> for the isotropic compression molding Didymium_<12.5>Fe_<69.8>Co_<10>Nb_1Y_<0.7>B_6 bonded magnet prepared by using the ribbons annealed at 650℃ for 10 min was 66.3 kJ/m^3 and the density was 6.1 Mg/m^3. The irreversible loss of this bonded magnet was -3.58% (at 150℃). It was found that the irreversible loss was improved by Y addition.
社団法人日本磁気学会の論文
2006-03-01