Metal magnetic material and electronic component

Patent metadata

Field	Value
Publication number	US-10622126-B2
Application number	US-201515304734-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Apr 18, 2014
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

Provided are: a metal magnetic material capable of reliably establishing insulation while realizing high saturation magnetic flux density; and an electronic component using the metal magnetic material and having low loss and good DC superimposition characteristics. The metal magnetic material for forming a component body of the electronic component comprises a metal magnetic alloy powder consisting of iron and silicon or containing iron, silicon and chromium; and an additional element added to the metal magnetic alloy powder, wherein the additional element is more easily oxidizable in the equilibrium state of oxidation-reduction reaction than the elements contained in the metal magnetic alloy powder. The component body (11) is internally formed with a coil pattern consisting of a plurality of coil conductor patterns (12A to 12C). The metal magnetic material is less likely to undergo degradation in magnetic properties even after it is subjected to a heat treatment at a high temperature, so that it becomes possible to perform a heat treatment for reducing a resistance of the coil pattern, at an adequate temperature.

First claim

The invention claimed is:

1. An electric component comprising: a component body formed using a metal magnetic material; and a coil formed inside or on a surface of the component body, wherein the metal magnetic material comprises a metal magnetic alloy powder containing iron and silicon, and an additional element added to the metal magnetic alloy powder, the additional element being more easily oxidizable in an equilibrium state of oxidation-reduction reaction than the elements contained in the metal magnetic alloy powder, wherein in the component body and in a vicinity of surfaces of particles of the metal magnetic alloy powder, a reaction product of the metal magnetic alloy powder and the additional element which is more easily oxidizable in an equilibrium state of oxidation-reduction reaction than the elements contained in the metal magnetic alloy powder is deposited, and adjacent particles of the metal magnetic alloy powder are bound together through the reaction product, wherein the additional element is lithium, wherein the reaction product comprises LiFe 5 O 8 , and wherein the component body does not contain glass.

2. The electric component as recited in claim 1 , wherein the metal magnetic alloy powder further contains chromium.

3. The electric component as recited in claim 2 , wherein the component body has a volume resistivity of 10 7 Ω·cm or more.

4. The electric component as recited in claim 2 , wherein the adjacent particles of the metal magnetic alloy powder are also mutually bound together.

5. The electric component as recited in claim 4 , wherein the component body has a volume resistivity of 10 7 Ω·cm or more.

6. The electric component as recited in claim 1 , wherein the metal magnetic alloy powder consists of iron and silicon.

7. The electric component as recited in claim 6 , wherein the component body has a volume resistivity of 10 7 Ω·cm or more.

8. The electric component as recited in claim 6 , wherein the adjacent particles of the metal magnetic alloy powder are also mutually bound together.

9. The electric component as recited in claim 8 , wherein the component body has a volume resistivity of 107Ω·cm or more.

10. The electric component as recited in claim 1 , wherein the adjacent particles of the metal magnetic alloy powder are also mutually bound together.

11. The electric component as recited in claim 10 , wherein the component body has a volume resistivity of 10 7 Ω·cm or more.

12. The electric component as recited in claim 1 , wherein the component body has a volume resistivity of 10 7 Ω·cm or more.

Assignees

• Toko Inc
• Murata Manufacturing Co

Inventors

• Yamamoto Makoto

Classifications

• H01F17/0013

  with stacked layers · CPC title

• H01F27/255

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

• H01F1/24 Primary

  the particles being insulated · CPC title

• C21D6/008

  containing Si · CPC title

• C22C38/18

  containing chromium · CPC title