Insulator-coated soft magnetic powder, method for producing insulator-coated soft magnetic powder, powder magnetic core, magnetic element, electronic device, and vehicle

Patent metadata

Field	Value
Publication number	US-2019267170-A1
Application number	US-201916286856-A
Country	US
Kind code	A1
Filing date	Feb 27, 2019
Priority date	Feb 28, 2018
Publication date	Aug 29, 2019
Grant date	—

Abstract

An insulator-coated soft magnetic powder includes core particles each of which includes a base portion containing a soft magnetic material and an oxide film provided on the surface of the base portion and containing an oxide of an element contained in the soft magnetic material, ceramic particles which are provided on the surface of each of the core particles and have an insulating property, and a glass material which is provided on the surface of each of the core particles, has an insulating property, and contains at least one type of phosphorus oxide, bismuth oxide, zinc oxide, boron oxide, tellurium oxide, and silicon oxide as a main component, wherein the ceramic particles are included in a proportion of 100 vol % or more and 500 vol % or less of the glass material.

First claim

What is claimed is:

1 . An insulator-coated soft magnetic powder, comprising:
core particles each of which includes a base portion containing a soft magnetic material and an oxide film provided on the surface of the base portion and containing an oxide of an element contained in the soft magnetic material; ceramic particles which are provided on the surface of each of the core particles and have an insulating property; and a glass material which is provided on the surface of each of the core particles, has an insulating property, and contains at least one type of phosphorus oxide, bismuth oxide, zinc oxide, boron oxide, tellurium oxide, and silicon oxide as a main component, wherein the ceramic particles are included in a proportion of 100 vol % or more and 500 vol % or less of the glass material.

2 . The insulator-coated soft magnetic powder according to claim 1 , wherein the ceramic particles contain aluminum oxide, silicon oxide, or zirconium oxide.

3 . The insulator-coated soft magnetic powder according to claim 1 , wherein the oxide film has a thickness of 5 nm or more and 200 nm or less.

4 . The insulator-coated soft magnetic powder according to claim 1 , wherein the core particles are a water atomized powder or a spinning water atomized powder.

5 . A method for producing an insulator-coated soft magnetic powder, comprising:
mixing ceramic particles having an insulating property with a glass material having an insulating property and also performing granulation, thereby obtaining insulating particles; and mixing core particles each of which includes a base portion containing a soft magnetic material and an oxide film provided on the surface of the base portion and containing an oxide of an element contained in the soft magnetic material with the insulating particles and also performing granulation, thereby obtaining composite particles.

6 . A powder magnetic core, comprising the insulator-coated soft magnetic powder according to claim 1 .

7 . A magnetic element, comprising the powder magnetic core according to claim 6 .

8 . An electronic device, comprising the magnetic element according to claim 7 .

9 . A vehicle, comprising the magnetic element according to claim 7 .

Assignees

• Seiko Epson Corp

Inventors

• Nakamura Atsushi

Classifications

• H01F41/0246

  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) · CPC title

• H01F1/24 Primary

  the particles being insulated · CPC title

• B22F2009/0828

  with water · CPC title

• H01F1/33 Primary

  mixtures of metallic and non-metallic particles; metallic particles having oxide skin · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title