高保磁力Pr-Fe-Co-Ti-B-Si系交換スプリング磁石の磁気特性

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Melt-spun ribbons of Pr_xFe_<91. 5xyz>Co_8T_<1y>B_2Si_<0. 5> (x=9. 0-11. 0, y=0. 5-2. 0, z=7. 5-11. 5) alloys were prepared by the single roller liquid rapid-quenching method, and the effects of composition, substrate surface velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows : composition : Pr_<10>Fe_<69. 5>Co_8Ti_<1. 5>B_<10. 5>Si_<0. 5> ; substrate surface velocity : 10. 0 m/s ; annealing condition ; 650℃ for 0 min in Ar atmosphere ; magnetic properties : (BH)_<max>=119. 9 kJ/m^3, H_<cJ>=1004. 0 kA/m, H_<cB>=559. 3 kA/m, J_r=0. 87 T, recoil ratio=29. 0%, H_k/H_<cJ>×100=33. 0 %, α(Jr)_<ave>=-0. 047 %/℃, α(H_<cJ>) =-0. 43 %/℃ and T_c=393℃. From TEM observation, the average particle size of this ribbon was found to be about 16 nm. Compression-molded isotropic bonded magnets were prepared by using Pr_<10>Fe_<69. 5>Co_8Ti_<1. 5>B_<10. 5>Si_<0. 5> ribbons annealed at 650℃ for 0 min. Their magnetic properties were (BH)_<max> =80.2 kJ/m^3, H_<cJ> =953.1 kA/m, H_<cB> =461. 9 kA/m, Jr=0. 69 T, Hk/H_<cJ>×100=32. 8 %, irreversible loss=-2. 12 % (at 125℃), density=6. 29 Mg/m^3.
2003-05-01