Magnetic core using composite material

Patent metadata

Field	Value
Publication number	US-12112876-B2
Application number	US-201917291755-A
Country	US
Kind code	B2
Filing date	Nov 15, 2019
Priority date	Nov 16, 2018
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

The present invention relates to a magnetic core using a different type of magnetic material. The magnetic core according to one embodiment may comprise: a ferrite powder comprising manganese (Mn), zinc, iron, and oxygen (O); and a metal alloy powder made of at least two substances from among nickel (Ni), iron (Fe), aluminum (Al), molybdenum (Mo), and silicon (Si). Here, the magnetic core can comprise 67 to 72 wt % of the ferrite powder and 28 to 33 wt % of the metal alloy powder.

First claim

The invention claimed is:

1. A magnetic core comprising:
67 wt % to 72 wt % of ferrite powder comprising manganese (Mn), zinc (Zn), iron (Fe), and oxygen (O);
28 wt % to 33 wt % of metal-alloy powder comprising at least one of nickel (Ni), and iron (Fe), and at least one of aluminum (Al), molybdenum (Mo), and silicon (Si); and
a nonmagnetic additive,
wherein a difference in molar ratio between the ferrite powder and the metal-alloy powder is less than 5% point, and
wherein the ferrite powder and the metal-alloy powder having micrometer-sized particles are bonded with each other,
wherein the nonmagnetic additive comprises at least one of silicon oxide (SiO 2 ), calcium oxide (CaO), tantalum pentoxide (Ta 2 O 5 ), niobium pentoxide (Nb 2 O 5 ), and vanadium pentoxide (V 2 O 5 ), and
wherein space between the two kinds of particles is filled with the nonmagnetic additive.

2. The magnetic core according to claim 1 , wherein the ferrite powder comprises Mn 0.67 Zn 0.23 Fe 2.09 O 4 , and
wherein the metal-alloy powder comprises molybdenum permalloy powder (MPP) (Ni 0.79 Fe 0.16 Mo 0.05 ).

3. The magnetic core according to claim 1 , wherein the metal-alloy powder comprises at least one of FeNi, FeSi, FeAlSi, and NiFeMo.

4. The magnetic core according to claim 1 , wherein the magnetic core has a Curie temperature of 300° C. or higher.

5. The magnetic core according to claim 1 , wherein the magnetic core has a resonance frequency of 1 MHz or higher.

6. A magnetic core comprising:
first ferrite powder comprising (Mn 0.67 Zn 0.23 Fe 2.09 O 4 ;
second ferrite powder comprising Ni 0.6 Zn 0.4 Fe 2 O 4 ; and
a nonmagnetic additive,
wherein a difference in molar ratio between the first ferrite powder and the second ferrite powder is less than 5% point,
wherein the first ferrite powder and the second ferrite powder having micrometer-sized particles are bonded with each other,
wherein the nonmagnetic additive comprises at least one of silicon oxide (SiO 2 ), calcium oxide (CaO), tantalum pentoxide (Ta 2 O 5 ), niobium pentoxide (Nb 2 O 5 ), and vanadium pentoxide (V 2 O 5 ), and
wherein space between the two kinds of particles is filled with the nonmagnetic additive.

7. The magnetic core according to claim 6 , wherein the magnetic core has a resonance frequency of 1 MHz or higher.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Mi Jin
• Jeon In Ho
• Lee Sang Won
• Bae Seok

Classifications

• Y10T428/32

  Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer · CPC title

• H01F1/344

  Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4 · CPC title

• C04B35/26

  based on ferrites · CPC title

• H01F27/255 Primary

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F3/08 Primary

  made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) · CPC title