Rapidly quenched Fe-based soft-magnetic alloy ribbon and its production method and core

Patent metadata

Field	Value
Publication number	US-10468182-B2
Application number	US-201715449420-A
Country	US
Kind code	B2
Filing date	Mar 3, 2017
Priority date	Jan 28, 2011
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

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.

First claim

What is claimed is:

1. A method for producing a quenched Fe-based amorphous alloy ribbon having wave-like undulations on a free surface by a single roll method, said wave-like undulations having transverse troughs arranged at longitudinal intervals, 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. by using a heating nozzle having a slit-shaped opening for blowing a heating gas onto the melt nozzle, the length of the slit-shaped opening of the heating nozzle being 1.2-2 times the horizontal length of a slit-shaped orifice of the melt nozzle, the temperature of a heating gas ejected from the heating nozzle being 1000-1400° C.; and (b) forming numerous linear scratches on a cooling roll surface by a wire brush, thereby providing a ground surface of said 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.

2. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein a hood is disposed, the melt nozzle and the heating nozzle being positioned in the hood, a gap being formed between the hood and the cooling roll.

3. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , said wave-like undulations having ridges, wherein each of the ridges extends in a transverse direction in regions longitudinally adjacent to a trough.

4. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein regions having said troughs occupy 70% or more of the width of said ribbon, as determined by selecting five arbitrary regions of 50 mm long on the ribbon in a longitudinal direction and averaging transverse-direction occupancy ratios measured in these regions.

5. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein said troughs continuously extend the entire width of said ribbon.

6. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein said troughs have longitudinal intervals L in a range of 1-5 mm; and wherein said ribbon has a thickness T in a range of 15-35 μm.

7. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein a ratio t/T of an average height difference t between said troughs and said ridges to the thickness of said ribbon is in a range of 0.02-0.2.

8. The method for producing a quenched Fe-based amorphous alloy ribbon according to claim 1 , wherein the transverse troughs are curved like waves.

9. A method for producing a core, comprising forming a quenched Fe-based amorphous alloy ribbon by the method recited in claim 1 , and laminating or winding the quenched Fe-based soft-magnetic alloy ribbon.

Assignees

• Hitachi Metals Ltd

Inventors

• Yoshizawa Yoshihito
• Ohta Motoki
• Ito Naoki

Classifications

• B22D11/0611

  formed by a single casting wheel, e.g. for casting amorphous metal strips or wires · CPC title

• H01F41/0226 Primary

  from amorphous ribbons · CPC title

• B22D11/0668

  for dressing, coating or lubricating · CPC title

• C21D2201/03

  Amorphous or microcrystalline structure · CPC title

• H01F3/04

  made from strips or ribbons · CPC title