Magnetic body and electronic component comprising the same

Patent metadata

Field	Value
Publication number	US-2016293308-A1
Application number	US-201615087651-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

In an embodiment, a magnetic body includes soft magnetic alloy grains 11 containing Fe, element L, and element M (where element L is Si or Zr and element M is a metal element other than Si or Zr that oxidizes more easily than Fe), as well as oxide film produced from oxidization of part of these grains 11 ; wherein at least some of the bonds between adjacent soft magnetic alloy grains 11 are by way of the oxide film; the oxide film has an inner film 12 a , and an outer film 12 b positioned on the outer side of the inner film 12 a ; and the inner film 12 a contains more of element L than element M, while the outer film 12 b contains more of element M than element L.

First claim

We/I claim:

1 . A magnetic body comprising:
soft magnetic alloy grains containing Fe, element L, and element M where element L is Si or Zr and element M is a metal element other than Si or Zr that oxidizes more easily than Fe, as well as oxide film produced from oxidization of part of the soft magnetic alloy grains; wherein adjacent soft magnetic alloy grains are bonded at least partly by the oxide film; the oxide film has an inner film, and an outer film located on an outer side of the inner film; and the inner film contains more of element L than element M, and the outer film contains more of element M than element L.

2 . A magnetic body according to claim 1 , wherein an average thickness of the inner film covering the soft magnetic alloy grains is in a range of 5 nm to 50 nm, and an average thickness of the outer film covering the inner film is in a range of 100 nm to 150 nm.

3 . An electronic component having a magnetic core that contains a magnetic body according to claim 1 .

4 . An electronic component having a magnetic core that contains a magnetic body according to claim 2 .

5 . A magnetic body according to claim 1 , wherein the content of Fe in the magnetic body as a whole is 92.5 to 96 percent by weight, the content of element L in the magnetic body as a whole is 1.5 to 3 percent by weight, and the content of element M in the magnetic body as a whole is 2 to 4.5 percent by weight.

6 . A magnetic body according to claim 1 , wherein the soft magnetic alloy grains are substantially free of Fe oxide.

7 . A magnetic body according to claim 1 , wherein the inner film contains Fe, element L, and element M, where L>Fe>M, and the outer film contains Fe, element L, and element M, where M>Fe>L.

Assignees

• Taiyo Yuden Kk

Inventors

• Ryu Minoru
• Takeoka Shinsuke
• Orimo Yoko
• Iwazaki Yoshiki
• Otake Kenji

Classifications

• B22F1/16

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

• C22C38/34

  with more than 1.5% by weight of silicon · CPC title

• C22C38/14

  containing titanium or zirconium · CPC title

• C22C38/02 Primary

  containing silicon · CPC title

• H01F1/147 Primary

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title