Metal magnetic particle, inductor, method for manufacturing metal magnetic particle, and method for manufacturing metal magnetic core

Patent metadata

Field	Value
Publication number	US-11965229-B2
Application number	US-202117201871-A
Country	US
Kind code	B2
Filing date	Mar 15, 2021
Priority date	Mar 27, 2020
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A metal magnetic particle provided with an oxide layer on a surface of an alloy particle containing Fe and Si. The oxide layer has a first oxide layer, a second oxide layer, a third oxide layer, and a fourth oxide layer. Also, in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy, the first oxide layer is a layer where Fe content takes a local maximum value, the second oxide layer is a layer where Fe content takes a local maximum value, the third oxide layer is a layer where Si content takes a local maximum value, and the fourth oxide layer is a layer where Fe content takes a local maximum value.

First claim

What is claimed is:

1. A metal magnetic particle comprising:
an oxide layer formed on a surface of an alloy particle containing Fe and Si, the oxide layer including a first oxide layer, a second oxide layer, a third oxide layer, and a fourth oxide layer from a side of the alloy particle, and
wherein
in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy,
the first oxide layer is a layer in which Si content takes a local maximum value,
the second oxide layer is a layer in which Fe content takes a local maximum value,
the third oxide layer is a layer in which Si content takes a local maximum value,
the fourth oxide layer is a layer in which Fe content takes a local maximum value, and
in the third oxide layer, the Fe content is greater than the Si content.

2. The metal magnetic particle according to claim 1 , wherein
a weight percentage of Si in the alloy particle is from 1.5 parts by weight to 8.0 parts by weight with respect to 100 parts by weight of a total weight of the Fe and the Si.

3. The metal magnetic particle according to claim 1 , wherein
the alloy particle contains smaller than 1.0 part by weight of Cr with respect to 100 parts by weight of a total weight of the Fe and the Si.

4. An inductor comprising:
the metal magnetic particles according to claim 1 .

5. The metal magnetic particle according to claim 2 , wherein
the alloy particle contains smaller than 1.0 part by weight of Cr with respect to 100 parts by weight of a total weight of the Fe and the Si.

6. An inductor comprising:
the metal magnetic particles according to claim 2 .

7. An inductor comprising:
the metal magnetic particles according to claim 3 .

8. A metal magnetic core in which the metal magnetic particles of claim 1 are joined to each other by the oxide layer.

9. The metal magnetic particle according to claim 1 , wherein a local maximum value of Si content in the first oxide layer is greater than a local maximum value of Si content in the third oxide layer.

Assignees

• Murata Manufacturing Co

Inventors

• Ishida Takuya
• Yamamoto Makoto
• Uji Katsutoshi
• Ishida Yuya
• Odahara Mitsuru

Classifications

• C22C38/02 Primary

  containing silicon · CPC title

• B22F1/145

  Chemical treatment, e.g. passivation or decarburisation · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F3/02

  Compacting only · CPC title

• H01F1/14766

  Fe-Si based alloys · CPC title