Nd-Fe-Co-V-Nb-B系交換スプリング磁石の磁気特性

概要

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Amorphous melt-spun Nd_9Fe_<74-x>Co_9V_1Nb_XB_7 (x=0-3) alloy ribbons were prepared by the single-roller melt-spinning method, and the effects of their composition and annealing condition on their magnetic properties were investigated.The optimum condition for preparation of Nd_9Fe_<74-x>Co_9V_1Nb_xB_7 alloy ribbons and some properties are as follows:composition, Nd_9Fe_<73>Co_9V_1Nb_1B_7; wheel velocity, 15 m/s;annealing condition, 700℃×0 min; magnetic properties, (BH)_<max> = 166.4 kJ/m^3 (20.9 MGOe). TEM observation showed that the average particle sized of Nd_9Fe<73>Co_9V_1Nb_1B_7 and Nd_9Fe_<71>Co_9V_1Nb_3B_7 ribbons were about 30 nm and 20 nm, respectively.Fine grains were randomly distributed from spotty rings of electron diffraction.The value of (BH)_<max> for an isotropic compressed bonded magnet prepared by using Nd_9Fe_<73>Co_9V_1Nb_1B_7 alloy ribbons annealed at 700℃×0 min was 96.7 kJ/m^3 (12.1 MGOe), and the density was 6.38 Mg/m^3.
社団法人日本磁気学会の論文
2000-04-15