IP Library › Granted Patent US 12686897
Granted Patent B2
US 12686897 · App. 18/027,924 · Granted Jul 21, 2026

Heat treatment method for amorphous alloy ribbon and heat treatment apparatus for amorphous alloy ribbon

Inventors: Hirohisa Sano (Tokyo, JP); Takeshi Fukuyama (Tokyo, JP)
Assignee: Proterial, Ltd.
C21D9/0068C21D9/0012C22C45/008H01F1/15341C22C2200/04C22C2202/02
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Quick Facts
Patent No.
US 12686897
App. No.
18/027,924
Granted
Jul 21, 2026
Kind
B2
Abstract

The present invention provides a heat treatment method and a heat treatment apparatus for an amorphous alloy ribbon, said method and apparatus being capable of uniformly heat treating an amorphous alloy ribbon, while suppressing the occurrence of anisotropy in the magnetic characteristics. A heat treatment method for an amorphous alloy ribbon, said method comprising a step wherein an amorphous alloy ribbon is transferred, while being in contact with a heated projected surface, and the amorphous alloy ribbon is transferred, while having the part that is in contact with the projected surface pressed against the projected surface from a surface which is on the reverse side of the surface that is in contact with the projected surface.

Claims (16)

1 . A heat treatment method for an amorphous alloy ribbon, comprising

a step of transferring an amorphous alloy ribbon while

(i) a first surface of the amorphous alloy ribbon is in surface contact with a convex curved surface of a heating roller to heat the amorphous alloy ribbon by heat conduction; and

(ii) a second surface opposite to the first surface of the amorphous alloy ribbon is in surface contact with a heated band member to heat the amorphous alloy ribbon by heat conduction;

wherein the heated band member is a metal band, is bridged over two rollers and driven thereby, and is heated by receiving heat from the two rollers; and

wherein the transferring is performed while a portion of the amorphous alloy ribbon that is in contact with the convex curved surface is pressed against the convex curved surface from a side opposite to a contact surface via the heated band member.

2 . The heat treatment method for an amorphous alloy ribbon according to claim 1 ,

wherein the step is performed a plurality of times by changing the first surface of the amorphous alloy ribbon with which the convex curved surface comes in contact.

3 . The heat treatment method for an amorphous alloy ribbon according to claim 1 ,

wherein the amorphous alloy ribbon is an Fe based nanocrystalline soft magnetic material, and

the heating roller and the two rollers are each heated to 500° C. or higher.

4 . The heat treatment method for an amorphous alloy ribbon according to claim 1 , wherein the heated band member forms a surface contact region extending along a circumferential direction of the heating roller.

5 . The heat treatment method for an amorphous alloy ribbon according to claim 1 , wherein one of the heating roller and the two rollers over which the heated band member is bridged is driven, and others of the heating roller and the two rollers are mechanically dependent.

6 . The heat treatment method for an amorphous alloy ribbon according to claim 1 , further comprising:

providing, upstream of the heating roller, a ribbon guide slope aligned with a tangent of the heating roller; and

introducing the amorphous alloy ribbon while suppressing meandering by the ribbon guide slope and a brake roller.