Abstract
The melt-spun ribbons of Didymium-Fe-Co-Nb-V-Y-Hf-B system alloys were prepared by single roller liquid rapid-quenching method, and the effects of composition, wheel velocity and heat treatment on the magnetic properties were investigated. As the result, Didymium11.0Fe69.6Co10Nb1V1Y0.7Hf0.7B6 optimum composition ribbons prepared at a wheel velocity of 22.5 m/s were crystallized by heat treatment, and the optimum heat treatment condition was found to be at 725°C for 5 min, and then the values of (BH)max and HcJ were 105.7 kJ/m3, 1307.4 kA/m, respectively. The temperature coefficients of Jr and HcJ for the ribbons crystallized from the melt-spun Didymium11.0Fe69.6Co10Nb1V1Y0.7Hf0.7B6 alloy were α(Jr)ave.=−0.10 %/°C (reversible) and α(HcJ)=−0.48 %/°C (irreversible), respectively. The value of (BH)max for the isotropic compression molding Didymium11.0Fe69.6Co10Nb1V1Y0.7Hf0.7B6 bonded magnet prepared by using the ribbons annealed at 725°C for 5 min is 56.6 kJ/m3 and the density is 6.14 Mg/m3. Irreversible loss of the isotropic bonded magnet are −1.21% (at 150°C) and −2.42% (at 200°C).
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