Pr-Fe-Co-V-W-Si-B系交換スプリング磁石の磁気特性

概要

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The melt-spun ribbons of Pr-Fe-Co-V-W-Si-B system alloys were prepared by single roller rapid-quenching method. The effects of composition, surface velocity and heat-treatment on the magnetic properties were investigated. The Pr9Fe71Co8V0.5W0.5Si0.5B10.5 alloy ribbons prepared at a surface velocity of 12.5 m/s were crystallized by heat-treatment, and the optimum heat-treatment condition was found to be at 575 °C for 3 min, then the magnetic properties were (BH)max = 136.1 kJ/m3,, Jr = 0.93 T, HcJ = 652.2 kA/m, and HcB = 528.3 kA/m. The temperature coefficients of Jr and HcJ for the ribbons crystallized from melt-spun ribbons of Pr9Fe71Co8V0.5W0.5Si0.5B10.5 alloy were α(Jr)ave = -0.057 %/°C and α(HcJ) = -0.450 %/°C. The value of (BH)max for the compression molding Pr9Fe71Co8V0.5W0.5Si0.5B10.5 isotropic bonded magnet prepared by using the ribbons annealed at 575 °C for 3 min is 80.0 kJ/m3, and the density is 6.24 Mg/m3.
社団法人電気学会の論文
2004-10-01