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AssigneeHitachi Metals, Ltd.
InventorsYoshihito Yoshizawa, Motoki Ohta, Naoki Ito
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A rapidly quenched Fe-based soft-magnetic alloy ribbon having wave-like undulations on a free surface, the wave-like undulations having transverse troughs arranged at substantially constant intervals in a longitudinal direction, and the troughs having an average amplitude D of 20 mm or less, is produced by a method comprising (a) keeping a transverse temperature distribution in a melt nozzle within ±15° C. to have as small a temperature distribution as possible in a melt paddle of the alloy, and (b) forming numerous fine linear scratches on a cooling roll surface by a wire brush, thereby providing a ground surface of the cooling roll with an arithmetical mean (average) roughness Ra of 0.1-1 μm and a maximum roughness depth Rmax of 0.5-10 μm.
A rapidly quenched Fe-based soft-magnetic alloy ribbon having wave-like undulations on a free surface, said wave-like undulations having transverse troughs arranged at substantially constant intervals in a longitudinal direction, and said troughs having an average amplitude D of 20 mm or less.
A method for producing a rapidly quenched Fe-based soft-magnetic alloy ribbon having wave-like undulations on a free surface, said wave-like undulations having transverse troughs arranged at substantially constant intervals in a longitudinal direction, and said troughs having an average amplitude D of 20 mm or less, the method comprising the steps of (a) keeping a transverse temperature distribution in a melt nozzle within ±15° C. to have as small a temperature distribution as possible in a melt paddle of said alloy;
Dependencies are inferred from the claim text.