Abstract
The melt-spun ribbons of Didymium-Fe-Co-Nb-V-B system alloys were prepared by single roller liquid rapid-quenching method. The effects of composition, wheel velocity and heat treatment on the magnetic properties were investigated. Didymium12.5Fe69.5Co10Nb1V1B6 ribbons prepared at a wheel velocity of 17.5 m/s were crystallized by heat treatment, and the optimum heat treatment condition was found to be at 600 °C for 5 min, then the values of (BH)max and HcJ were 128.3 kJ/m3, 1100.0 kA/m, respectively. The temperature coefficients of Jr and HcJ for the ribbons crystallized from the Didymium12.5Fe69.5Co10Nb1V1B6 alloy were α(Jr)ave=-0.044 %/°C(reversible) and α(HcJ)=-0.370 %/°C(irreversible), respectively. The value of (BH)max for the isotropic compression molding Didymium12.5Fe69.5Co10Nb1V1B6 bonded magnet prepared by using the ribbons annealed at 600 °C for 5 min is 88.9 kJ/m3 and the density is 6.3 Mg/m3. Irreversible loss of the bonded magnet is -3.64 %/°C(at 150 °C).
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