| 摘要 |
PURPOSE:To obtain a ferrous high permeability amorphous magnetic material excellent in magnetic permeability in a high frequency zone by regulating the sheet thickness and surface roughness of an iron-base high permeability alloy having a specific composition consisting of Fe, Si, B, and C to specific values, respectively. CONSTITUTION:The sheet thickness and surface roughness of an iron-base high permeability alloy represented by composition formula Fe100-x-yAxBy [where A means (Si+B), B means C, (x) is 15 to 25atomic%, and (y) is 0.1 to 2.0atomic%] are regulated to <=0.020mm and 0.2mum average value roughness Ra (cutoff value, 0.25mm), respectively, by which a ferrous amorphous material is prepared. This material can be obtained by subjecting a master alloy having the prescribed composition to vacuum melting, to rapid cooling by means of chill block melt spinning, etc., and then to stress relief annealing in vacuum. Further, by limiting sheet thickness and surface roughness, deterioration in magnetic permeability is prevented and eddy current iron loss and A.C. iron loss are reduced. By this method, the magnetic material having high magnetic permeability in the frequency of >=about 10KHz and usable in the can be obtained. |
