# US 2014/0191832 A1 · Primary ultrafine-crystalline alloy ribbon and its cutting method, and nano-crystalline, soft magnetic alloy ribbon and magnetic device using it

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- Number: US 2014/0191832 A1
- Document ID: US20140191832A1
- Status: Published application
- Kind: A1
- Application number: 14/239,682
- Filed: 2012-09-11
- Published: 2014-07-10
- Earliest claimed: 2011-10-03
- Assignees: Hitachi Metals, Ltd.
- Inventors: Motoki Ohta; Yoshihito Yoshizawa
- Web page: https://patentgrep.com/patent/US20140191832A1

## CPC

- H01F 1/15308: {based on Fe/Ni (H01F1/15325 takes precedence)}
- B22D 11/001: {of specific alloys}
- B22D 11/06: into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D 11/0611: {formed by a single casting wheel, e.g. for casting amorphous metal strips or wires}
- B26F 3/00: Severing by means other than cutting; Apparatus therefor (severing by grinding B24B27/06)
- C21D 6/00: Heat treatment of ferrous alloys
- C22C 33/003: {making amorphous alloys}
- C22C 45/02: with iron as the major constituent
- H01F 1/15333: {containing nanocrystallites, e.g. obtained by annealing}
- C21D 8/1211: {Rapid solidification; Thin strip casting}
- C21D 2201/03: Amorphous or microcrystalline structure
- C21D 2221/01: End parts (e.g. leading, trailing end)
- C21D 2221/02: Edge parts
- C21D 2261/00: Machining or cutting being involved
- C22C 45/00: Amorphous alloys (making amorphous non-ferrous alloys C22C1/11)
- Y10T 225/10: Methods
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- B26F: PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING (marking-out, perforating or making buttonholes A41H25/00; shoemaking A43D; surgery A61B; punching metal B21D; drilling metal B23B; cutting of metal by applying heat locally, e.g. flame cutting, B23K; cutting by abrasive fluid jets B24C5/02; details common to machines for severing B26D; drilling wood B27C; drilling stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; of glass C03B; of leather C14B; of textile materials D06H; for light guides G02B6/25; of tickets G07B)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for cutting a primary ultrafine-crystalline alloy ribbon having a structure in which ultrafine crystal grains having an average grain size of 30 nm or less are dispersed in a proportion of 5-30% by volume in an amorphous matrix, comprising placing the ribbon on a soft base deformable to an acute angle by local pressing, bringing a cutter blade into horizontal contact with a surface of the ribbon, and pressing the cutter to the ribbon to apply uniform pressure thereto, thereby bending the ribbon along a cutter blade edge to brittly fracture-cut the ribbon.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A primary ultrafine-crystalline alloy ribbon having a composition represented by the general formula of Fe100-x-y-zAxByXz, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers meeting the conditions of 0<x≦5, 10≦y≦22, 0≦z≦10, and x+y+z≦25, respectively, when expressed by atomic %, and having a structure in which ultrafine crystal grains having an average grain size of 30 nm or less are dispersed in a proportion of 5-30% by volume in an amorphous matrix;
said primary ultrafine-crystalline alloy ribbon having a width of 10 mm or more and a thickness of 15 μm or more, with thickness difference of 2 μm or less in a transverse direction;
said primary ultrafine-crystalline alloy ribbon having Vickers hardness Hv (measured at a load of 100 g) of 850-1150 in both center and side portions in a transverse direction; and
the difference of Vickers hardness Hv (measured at a load of 100 g) between the center portion and the side portions being 150 or less.

### Claim 12 (depends on 11)

The primary ultrafine-crystalline alloy ribbon according to claim 11, which has higher Vickers hardness Hv (measured at a load of 100 g) in the center portion than in the side portions.

### Claim 13 (depends on 11)

The primary ultrafine-crystalline alloy ribbon according to claim 11, which has Vickers hardness Hv (measured at a load of 100 g) of 850-1100 in both center and side portions in a transverse direction.

### Claim 14 (depends on 12)

The primary ultrafine-crystalline alloy ribbon according to claim 12, which has Vickers hardness Hv (measured at a load of 100 g) of 850-1100 in both center and side portions in a transverse direction.

### Claim 15

A method for cutting a primary ultrafine-crystalline alloy ribbon having a structure in which ultrafine crystal grains having an average grain size of 30 nm or less are dispersed in a proportion of 5-30% by volume in an amorphous matrix; said ribbon having a width of 10 mm or more and a thickness of 15 μm or more, with thickness difference being 2 μm or less in a transverse direction, and having Vickers hardness Hv (measured at a load of 100 g) of 850-1150 in both center and side portions in a transverse direction, the difference of Vickers hardness Hv (measured at a load of 100 g) between the center portion and the side portions being 150 or less; which comprises the steps of
placing said primary ultrafine-crystalline alloy ribbon on a soft base deformable to an acute angle by local pressing;
bringing a cutter blade into horizontal contact with a surface of said primary ultrafine-crystalline alloy ribbon; and
pressing said cutter to said primary ultrafine-crystalline alloy ribbon to apply uniform pressure thereto, thereby bending said primary ultrafine-crystalline alloy ribbon along a blade edge of said cutter to fracture-cut it.

### Claim 16 (depends on 15)

The method for cutting a primary ultrafine-crystalline alloy ribbon according to claim 15, wherein said base is a laminate of an upper layer formed by a rubber sheet and a lower layer formed by a sponge.

### Claim 17 (depends on 16)

The method for cutting a primary ultrafine-crystalline alloy ribbon according to claim 16, wherein said rubber sheet is a sheet of natural or synthetic rubber having a thickness of 0.3-2 mm, and said sponge is a foamed rubber or resin having a thickness of 2-30 mm.

### Claim 18

A nanocrystalline, soft magnetic alloy ribbon obtained by heat-treating a primary ultrafine-crystalline alloy ribbon having a composition represented by the general formula of Fe100-x-y-zAxByXz, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers meeting the conditions of 0<x≦5, 10≦y≦22, 0≦z≦10, and x+y+z≦25, respectively, when expressed by atomic %, and having a structure in which ultrafine crystal grains having an average grain size of 30 nm or less are dispersed in a proportion of 5-30% by volume in an amorphous matrix; said primary ultrafine-crystalline alloy ribbon having a width of 10 mm or more and a thickness of 15 μm or more, with thickness difference of 2 μm or less in a transverse direction, and Vickers hardness Hv (measured at a load of 100 g) of 850-1150 in both center and side portions in a transverse direction; the difference of Vickers hardness Hv (measured at a load of 100 g) between the center portion and the side portions being 150 or less;
said nanocrystalline, soft magnetic alloy ribbon having a structure in which fine crystal grains having an average grain size of 60 nm or less are dispersed in a proportion of 30% or more by volume in an amorphous matrix, and being fracture-cut along a cutter blade in horizontal contact with a surface of said ribbon before or after the heat treatment;
when notches are generated along the fracture-cut portion of said ribbon, the percentage of said notches being 5% or less, which is determined by the following formula:
Percentage of notches=(Dav/D)×100(%),
wherein D is the width of said ribbon, Dav is an average depth of said notches, which is obtained by dividing the total area of said notches by the width D of said ribbon.

### Claim 19 (depends on 18)

The nanocrystalline, soft magnetic alloy ribbon according to claim 18, wherein said cut portion at least partially has a cross section formed by brittle fracture.

### Claim 20 (depends on 18)

The nanocrystalline, soft magnetic alloy ribbon according to claim 18, wherein said notches are free from acute-angle corners.

### Claim 21 (depends on 19)

The nanocrystalline, soft magnetic alloy ribbon according to claim 19, wherein said notches are free from acute-angle corners.

### Claim 22 (depends on 18)

A magnetic device formed by the nanocrystalline, soft magnetic alloy ribbon recited in claim 18.