| 摘要 |
PURPOSE:To produce an amorphous alloy magnetic core having a low iron loss in a high-frequency region by winding or laminating a thin amorphous ferrous alloy strip and forming an oxide film layer on the surface thereof to an adequate thickness during the stress relief heat treatment thereof. CONSTITUTION:After the thin amorphous ferrous alloy strip is wound or laminated, the oxide film layer is formed over the entire surface of the above-mentioned strip to >=200Angstrom and <=3,000Angstrom thickness during the stress relief heat treatment thereof, by which the high-frequency magnetic core having the low iron loss is obtd. The above-mentioned heat treatment is preferably executed in a mixed atmosphere composed of an inert gas and oxygen while said atmosphere is forcibly supplied. The above-mentioned atmosphere is adequately formed by setting the mixing molar ratio of the inert gas and oxygen, designated as (100-C):C, at 0.01<=C<=10. The above-mentioned alloy has preferably the positive satd. magnetorestriction expressed by the general formula (Fe1-aMa)100-bXb (M; >=1 kinds among Ti, V, Cr, Mn, Co, Ni, Zr, Nb, Mo, Hf, Ta and W, X; >=1 kinds among Si, B, P, C and Ge, 0<=a<=0.15, 12<=b<=30). |
