| 摘要 |
PURPOSE:To produce a rare-earth magnetic alloy powder having excellent magnetic characteristics such as coercive force, magnetization quantity and superior quality by performing the dehydrogenation process at a specified rate in the hydrogen occlusion and dehydrogenation processes of the alloy powder consisting of rare-earth elements, transition metals and boron. CONSTITUTION:This rare-earth magnetic alloy powder consisting of the aggregate of fine crystal grains having 0.02 to 5mum average crystal grain size and consisting essentially of R2T14B (wherein R is rare-earth element containing Y and T is a transition metal) is subjected to hydrogen occlusion and dehydrogenation processing to effect recrystallization reaction. The composition of the rare-earth magnetic alloy consists of 25 to 35wt.% R, 0.5 to 1.5wt.% B, 3 to 20wt.% Co, 0.05 to 5wt.% of at least one metal selected among Ga, Zr, Hf, Nb, Ta, etc., and the balance Fe. Further, the dehydrogenation process is performed under the degree of vacuum (Y) expressed by an exponential function Y=AXZ (wherein Z is -0.7 to -0.3) in the range of 60 to 1000sec dehydrogenation time (X). |
