Pr(Nd)-Fe-Co-Nb-Cu-Si-B系急冷薄帯並びにそれらのボンド磁石の磁気特性

概要

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Melt-spun ribbons of Pr-Fe-Co-Nb-Cu-Si-B system alloys were prepared by single roller rapid-quenching method. Effects of composition,wheel velocity and heat-treatment on magnetic properties were investigated. The optimum preparation conditions of compounds were as follows: composition Pr9Fe68.5Co10Nb1Cu0.5Si0.5B10.5; wheel velocity 12.5 m/s; heat-treatment 625 °C for 5 min. Magnetic properties obtained were (BH)max = 121.8 kJ/m3, Jr = 0.90 T, HcJ = 898.7 kA/m, and HcB = 509.0 kA/m. Temperature coefficients of Jr and HcJ of the ribbons of Pr9Fe68.5Co10Nb1Cu0.5Si0.5B10.5 alloy were α(Jr)ave = -0.034 %/°C and α(HcJ) = -0.290 %/°C, respectively. The value of (BH)max for the isotropic Pr9Fe68.5Co10Nb1Cu0.5Si0.5B10.5 bonded magnet prepared by using ribbons annealed at 625 °C for 5 min is 84.4 kJ/m3. Irreversible loss of the bonded magnet is -2.74 % (at 125°C).
2006-12-01