The melt-spun ribbons of Pr-Fe-CoW -B system alloys were prepared by single roller rapid-quenching method. The effects of composition,wheel velocity and heat-treatment on the magnetic properties were investigated. The Pr9Fe76.7Co8W0.3B6 ribbon prepared at a wheel velocity of 15.0 m/s were crystallized by heat-treatment, and the optimum heat-treatment condition was found to be at 600 ℃ for 3 min, then the value of (BH)max was 148.5 kJ/m 3. The temperature coefficients of Jr and HcJ for the ribbons crystallized from the amorphous Pr9Fe76.7Co8W0.3B6 alloy were α(Jr)=-0.03 %/℃(reversible)and α(HcJ)=-0.45 %/℃(irreversible),respectively. The value of (BH)max for the compression molding Pr9Fe76.7Co8W0.3B6 isotropic bonded magnet prepared by using the ribbons annealed at 600 ℃ for 3 min is 86.00 kJ/m 3 and the density is 6.16 Mg/m 3 .
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