高保磁力Pr-Fe-Co-Ti-B-Si系急冷薄帯の磁気特性,組織観察並びにそれらボンド磁石の諸特性

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Melt-spun ribbons of Pr_xFe_<98-x-y-z>Co_yTi_<1.5>B_zSi_<0.5> (x=10.0-13.0, y=8.0-12.0, z=7.0-14.0) alloys were prepared by the single roller liquid rapid-quenching method, and the effects of composition, wheel velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows: composition: Pr_<11>Fe_<68.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5>; wheel velocity: 10.0 m/s; annealing condition: 600℃ for 5 min in Ar atmosphere; magnetic properties J_r=0.8T (8.0kG), H_<cj>=1.57 MA/m (19.7 kOe), H_<cB>=0.55 MA/m (6.9 kOe), (BH)_<max>=111.2 kJ/m^3 (13.9 MGOe), H_k/H_<cJ>×100=24.9%, α(J_r)=-0.04%/℃, α(H_<cJ>)=-0.37%/℃ and T_c=403℃. From TEM observation, the average particle size of this ribbon was found to be about 23 nm. The isotropic compression molding bonded magnets were prepared by using Pr_<11>Fe_<68.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5>ribbons annealed at 600℃ for 5 min. Their magnetic properties of this bonded magnet ware J_r=0.60T (6.0 kG), H_<cJ>=1.53 MA/m(19.3 kOe), H_<cB>=0.42 MA/m (5.2 kOe), and (BH)_<max>=66.8 kJ/m^3 (8.4 MGOe). In the P_<13>Fe_<63>Co_8Ti_<1.5>B_<14>Si_<0.5> composition, it was found that Boron exists near at the grain boundary from the element distribution of TEM. It is considered that these Boron elements serve as pining site in magnetization process.
明治大学の論文
2006-01-30