# US 2025/0083226 A1 · Alloy particle, dust core, electronic element, electronic device, electric motor, and electric generator

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- Number: US 2025/0083226 A1
- Document ID: US20250083226A1
- Status: Published application
- Kind: A1
- Application number: 18/727,615
- Filed: 2023-08-18
- Published: 2025-03-13
- Earliest claimed: 2022-12-21
- Assignees: Niterra Co., Ltd.
- Applicants: Niterra Co., Ltd.
- Inventors: Yoichi ITO; Kenichi SHIOTSU
- Web page: https://patentgrep.com/patent/US20250083226A1

## CPC

- B22F 1/16: Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10)
- B22F 5/106: {Tube or ring forms}
- H01F 1/14766: {Fe-Si based alloys}
- H01F 1/20: in the form of particles, e.g. powder (H01F1/147 takes precedence)
- H01F 1/22: pressed, sintered, or bound together
- H01F 1/24: the particles being insulated
- H01F 1/33: mixtures of metallic and non-metallic particles; metallic particles having oxide skin
- H01F 17/04: with magnetic core
- H01F 27/255: made from particles (H01F27/26 takes precedence)
- B22F 1/10: Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F 3/04: by applying fluid pressure {, e.g. by cold isostatic pressing [CIP]}
- B22F 2003/248: {Thermal after-treatment}
- B22F 2301/35: Iron
- B22F 2302/45: Others, including non-metals
- 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)}
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An alloy particle (5) includes: a core portion (1) made of an alloy that contains iron and silicon; and a coating portion (3) coating the core portion (1). The coating portion (3) contains Fe2SiO4, and, when measurement is performed on the coating portion (3) through X-ray diffraction, a strongest peak intensity of FeO is defined as IA, and a strongest peak intensity of the Fe2SiO4 is defined as IB, a peak intensity ratio (IA/IB) has a value of 0.2 or lower.

## Claims

### Claim 1

An alloy particle comprising:
a core portion made of an alloy that contains iron and silicon; and
a coating portion coating the core portion, wherein
the coating portion contains Fe2SiO4, and,
when
measurement is performed on the coating portion through X-ray diffraction,
a strongest peak intensity of FeO is defined as IA, and
a strongest peak intensity of the Fe2SiO4 is defined as IB,
a peak intensity ratio (IA/IB) has a value of 0.2 or lower.

### Claim 2 (depends on 1)

A dust core comprising a plurality of alloy particles each of which is the alloy particle according to claim 1.

### Claim 3 (depends on 2)

An electronic element comprising the dust core according to claim 2.

### Claim 4 (depends on 3)

The electronic element according to claim 3, further comprising a coil.

### Claim 5 (depends on 3)

An electronic device comprising the electronic element according to claim 3.

### Claim 6 (depends on 2)

An electric motor comprising the dust core according to claim 2.

### Claim 7 (depends on 2)

An electric generator comprising the dust core according to claim 2.