低希土類Pr-Fe-Co-Ti-Nb-Y-B系急冷薄帯並びにそれらボンド磁石の諸特性(ハード・ソフト磁性材料)

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Melt-spun ribbons made from low-rare-earth Pr-Fe-Co-Ti-Nb-Y-B system alloys were prepared by the single-roller rapid-quenching method, and the effects of composition, wheel velocity, and heat-treatment on their magnetic properties were investigated. It was found that the coercivity in Pr_<3.5>Fe_<79-x>Co_8Ti_<1.5>Nb_1Y_xB_7 ribbon increases with the amount of Y. In pr_<3.5>Fe_<78.5>Co_8Ti_<1.5>Nb_1Y_0.50.5B7 alloy ribbons, the magnetic properties were obtained (BH)_<max>=109.6 kJ/m^3 Jr=1.29 T, H_<cj>=249.6 kA/m, and H_<cB>=209.6 kA/m. The temperature coefficients of J_r and H_cj of Pr_<3.5>Fe_<78>Co_8Ti_<1.5> Nb_1YiB_7 alloy ribbons were α(J_r)_<ave>=-0.038%/℃ and α(H_<cj>)=-0.390%/℃, respectively. The irreversible loss of an isotropic compression molding Pr_<3.5>Fe_<78.5>Co8Ti_<1.5>Nb_1Y_<0.5>B_7 bonded magnet prepared by using ribbons annealed at 675℃ for 5 min is -2.0% at 75℃, and this value was almost the same as that for an alnico bonded magnet.
社団法人日本磁気学会の論文
2007-03-01