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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11011305 B1

PDFFull Text
Date of Patent:
May. 18, 2021

Filed:

May. 24, 2018

Powder magnetic core, and coil component

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventors:

Yoshimasa Nishio, Tottori, JP;

Shin Noguchi, Osaka, JP;

Kazunori Nishimura, Osaka, JP;

Tetsuroh Katoh, Osaka, JP;

Toshio Mihara, Osaka, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Xiaowei Su

Int. Cl.
CPC ...
H01F 41/02 (2006.01); B22F 3/10 (2006.01); H01F 27/28 (2006.01); B22F 3/16 (2006.01); H01F 1/22 (2006.01); H01F 1/147 (2006.01); H01F 1/24 (2006.01); H01F 1/33 (2006.01); B22F 1/02 (2006.01); C22C 38/00 (2006.01); H01F 27/255 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/34 (2006.01); C22C 33/02 (2006.01);
U.S. Cl.
CPC ...
H01F 41/02 (2013.01); B22F 1/02 (2013.01); B22F 3/1039 (2013.01); B22F 3/16 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/34 (2013.01); H01F 1/147 (2013.01); H01F 1/22 (2013.01); H01F 1/24 (2013.01); H01F 1/33 (2013.01); H01F 27/255 (2013.01); H01F 27/2823 (2013.01); H01F 41/0246 (2013.01); B22F 2201/03 (2013.01); B22F 2201/05 (2013.01); B22F 2302/253 (2013.01); B22F 2304/10 (2013.01); C22C 33/02 (2013.01); C22C 2202/02 (2013.01);
Abstract

A method for manufacturing a powder magnetic core using a soft magnetic material powder, wherein the method has: a first step of mixing the soft magnetic material powder with a binder, a second step of subjecting a mixture obtained through the first step to pressure forming, and a third step of subjecting a formed body obtained through the second step to heat treatment. The soft magnetic material powder is an Fe—Cr—Al based alloy powder comprising Fe, Cr and Al. An oxide layer is formed on a surface of the soft magnetic material powder by the heat treatment. The oxide layer has a higher ratio by mass of Al to the sum of Fe, Cr and Al than an alloy phase inside the powder.

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