An experiment was carried out to examine the effect of composition, heat treatment, and nitrogenation conditions on the magnetic properties of Sm-Fe-Co-Mn nitrides with TbCu7-type structure. The optimum preparation conditions of the compounds were as follows: composition {Sm10(Fe0.9Co0.1)89.5Mn0.5}84N16; roller velocity 50 m/s; heat treatment 700℃× 60 min in high-purity Ar gas; and nitrogenation condition 420℃×15 h in high-purity N2 gas.Typical magnetic properties of the obtained powders were as follows: Jr = 0.96 T, HcJ = 699.2 kA/m, (BH)max = 138.3 kJ/m 3 (17.4 MGOe), and Tc = 508℃. Recoil loops of the hysteresis curve and X-ray analysis showed that the sample was an exchange spring magnet. The value of (BH)max of the bonded magnet prepared from {Sm10(Fe0.9Co0.1)89.5Mn0.5}84N16 powder was 92.1 kJ/m 3 (11.6 MGOe) when the density of the bonded magnet was 6.05 Mg/m 3 . The magnetization process of these nitrides is of the pinning-type. The reversible temperature coefficient of Jr was α(Jr) = -0.04%/℃ in the range from 25℃ to 125℃.
The melt-spun ribbons of Pr-Fe-CoW -B system alloys were prepared by single roller rapid-quenching method. The effects of composition,wheel velocity and heat-treatment on the magnetic properties were investigated. The Pr9Fe76.7Co8W0.3B6 ribbon prepared at a wheel velocity of 15.0 m/s were crystallized by heat-treatment, and the optimum heat-treatment condition was found to be at 600 ℃ for 3 min, then the value of (BH)max was 148.5 kJ/m 3. The temperature coefficients of Jr and HcJ for the ribbons crystallized from the amorphous Pr9Fe76.7Co8W0.3B6 alloy were α(Jr)=-0.03 %/℃(reversible)and α(HcJ)=-0.45 %/℃(irreversible),respectively. The value of (BH)max for the compression molding Pr9Fe76.7Co8W0.3B6 isotropic bonded magnet prepared by using the ribbons annealed at 600 ℃ for 3 min is 86.00 kJ/m 3 and the density is 6.16 Mg/m 3 .
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