| 摘要 |
PURPOSE:To effectively prevent the deterioration of magnetic characteristics at the time of annealing by annealing the boron-contained iron-based thin amorphous alloy strip having an insulating film consisting of an oxide system on the surface while using a reduced-pressure inert gaseous atmosphere. CONSTITUTION:The boron-contained iron-based thin amorphous alloy strip having the insulating film consisting of an oxide system formed by an anodic oxidation on the surface is annealed to relieve stresses. The reduced-pressure inert gaseous atmosphere is used as the annealing environment at this time. The above-mentioned pressure reduction is preferably executed under 10<-4> to 100Torr. The deterioration in magnetic characteristics, such as iron loss, at the time of annealing is prevented in this way. An alloy contg. 7 to 16atomic% B, 4 to 14% Si, contg. further <=2% C at need, and consisting of the balance substantially Fe or an alloy contg. 7 to 16% B, 4 to 14% Si, 0.5 to 10% Mn or Ni, and further consisting of <=2% C and 65 to 85% Fe at need is adequate as the boron-contained iron-based alloy mentioned above. |
