抄録
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 Didymium12.5Fe69.8Co10Nb1Y0.7B6; wheel velocity 20.0 m/s; heat treatment 650°C for 10 min. Magnetic properties of this ribbon were (BH)max = 126.4 kJ/m3 and HcJ = 1409.0 kA/m. The value of (BH)max for the isotropic compression molding Didymium12.5Fe69.8Co10Nb1Y0.7B6 bonded magnet prepared by using the ribbons annealed at 650°C for 10 min was 66.3 kJ/m3 and the density was 6.1 Mg/m3. The irreversible loss of this bonded magnet was -3.58 % (at 150°C). It was found that the irreversible loss was improved by Y addition.
