Soft magnetic material powder and manufacturing method thereof, and magnetic core and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11965117-B2
Application number	US-202017087146-A
Country	US
Kind code	B2
Filing date	Nov 2, 2020
Priority date	Oct 10, 2014
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A soft magnetic material powder includes soft magnetic material particles, the soft magnetic material particles each include a core formed from an Fe-based soft magnetic material and an insulating film covering the surface of the core, and the insulating film contains an inorganic oxide and a water soluble polymer. A magnetic core includes soft magnetic material particles and a binder bonding the soft magnetic material particles to each other, the soft magnetic material particles each include a core containing an Fe-based soft magnetic material and an insulating film covering the surface of the core, and the insulating film contains an inorganic oxide and a water soluble polymer.

First claim

The invention claimed is:

1. A method for manufacturing a magnetic core, the method comprising:
forming a soft magnetic material powder by forming an insulating film on surfaces of cores comprising a soft magnetic material by hydrolyzing a metal alkoxide,
molding the soft magnetic material powder, and
heat treating the molded soft magnetic powder to form the magnetic core.

2. The method for manufacturing a magnetic core of claim 1 , wherein
the soft magnetic material is an Fe-based soft magnetic material.

3. The method of manufacturing a magnetic core according to claim 1 , wherein
the soft magnetic material contains at least one selected from the group consisting of Fe, FeNi, FeCo, FeSi, FeSiCr, FeSiAl, and FeSiBCr.

4. The method for manufacturing a magnetic core of claim 1 , wherein
the magnetic core contains soft magnetic material particles formed from the molded and heat treated soft magnetic material powder having the insulating film formed on the surfaces thereof, and
the insulating film contains at least one selected from the group consisting of Ti, Si, Al and Zr.

5. The method of manufacturing a magnetic core according to claim 4 , wherein
the insulating film contains Fe.

6. The method of manufacturing a magnetic core according to claim 4 , wherein
the insulating film further contains Cr.

7. The method of manufacturing a magnetic core according to claim 1 , wherein
the heat treatment is performed at a temperature of 400° C. or more.

8. The method of manufacturing a magnetic core according to claim 1 , wherein
the heat treatment is performed at a temperature of 900° C. or less.

Assignees

• Murata Manufacturing Co

Inventors

• Ishida Yuya

Classifications

• C09D7/61 Primary

  inorganic · CPC title

• B01J13/02

  Making microcapsules or microballoons {(for medical preparations A61K9/50)} · CPC title

• B01J13/08

  Simple coacervation, i.e. addition of highly hydrophilic material {(combined with spraying B01J13/043; combined with mechanical division B01J13/04)} · CPC title

• B22F1/102

  Metallic powder coated with organic material · 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