# US 7,744,702 B2 · Soft magnetic alloy powder, compact, and inductance element

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- Number: US 7,744,702 B2
- Document ID: US7744702B2
- Status: Granted
- Kind: B2
- Application number: 11/976,029
- Filed: 2007-10-19
- Published: 2008-05-01
- Granted: 2010-06-29
- Earliest claimed: 2006-10-31
- Assignees: TDK Corporation
- Inventors: Hiroshi Tomita; Hideharu Moro; Kesaharu Takatoh; Koyu Enda
- Web page: https://patentgrep.com/patent/US7744702B2

## CPC

- H01F 17/04: with magnetic core
- C22C 19/03: based on nickel
- C22C 33/0285: {with Cr, Co, or Ni having a minimum content higher than 5%}
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- H01F 1/14733: {in the form of particles}
- H01F 1/26: by macromolecular organic substances
- H01F 3/08: made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06)
- H01F 41/0246: {Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36)}
- C22C 2202/02: Magnetic
- H01F 1/14766: {Fe-Si based alloys}
- H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A soft magnetic alloy powder containing Fe—Ni-based crystal particles is provided as one capable of adequately reducing core loss of a powder magnetic core and achieving satisfactory magnetic characteristics at an effective operating temperature of an element. The present invention provides a soft magnetic alloy powder containing Fe—Ni-based crystal particles containing 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and containing 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.

## Claims

### Claim 1

A soft magnetic alloy powder comprising Fe—Ni-based particles containing 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and
containing 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.

### Claim 2 (depends on 1)

The soft magnetic alloy powder according to claim 1, wherein the Fe—Ni-based particles has an average particle size of more than 10 μm and less than 100 μm.

### Claim 3

A compact comprising Fe—Ni-based particles a part or whole of a surface of which is coated with an insulator, wherein said Fe—Ni-based particles contain 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and contain 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.

### Claim 4

An inductance element comprising a powder magnetic core comprised of a compact,
wherein the compact comprises Fe—Ni-based particles a part or whole of a surface of which is coated with an insulator, wherein said Fe—Ni-based particles contain 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and contain 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.

### Claim 5

An inductance element comprising a powder magnetic core comprised of a compact, and a coil buried in the powder magnetic core,
wherein the compact comprises Fe—Ni-based particles a part or whole of a surface of which is coated with an insulator, wherein said Fe—Ni-based particles contain 45 to 55 mass % Fe and 45 to 55 mass % Ni, relative to a total mass of Fe and Ni, and contain 1 to 12 mass % Co and 1.2 to 6.5 mass % Si, relative to a total mass of Fe, Ni, Co, and Si.