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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 10832840 B1

PDFFull Text
Date of Patent:
Nov. 10, 2020

Filed:

Dec. 12, 2016

Powder for dust cores, method for producing same, dust core and method for producing dust core

Applicant:

Denso Corporation, Kariya, JP;

Inventors:

Ken Matsubara, Kariya, JP;

Jung Hwan Hwang, Nagakute, JP;

Seishi Utsuno, Nagakute, JP;

Assignee:

DENSO CORPORATION, Kariya, JP;

Attorney:

Harness, Dickey & Pierce, P.L.C.

Primary Examiner:

Bernard Rojas

Int. Cl.
CPC ...
H01F 1/147 (2006.01); H01F 1/33 (2006.01); H01F 1/24 (2006.01); B22F 1/02 (2006.01); C01G 49/00 (2006.01); H01F 41/02 (2006.01); C22C 38/00 (2006.01); H01F 3/08 (2006.01); B22F 3/02 (2006.01); C22C 33/02 (2006.01); B22F 1/00 (2006.01); B22F 3/10 (2006.01); B22F 3/24 (2006.01); B22F 9/08 (2006.01); B22F 9/16 (2006.01); B22F 9/02 (2006.01); H01F 10/20 (2006.01);
U.S. Cl.
CPC ...
H01F 1/147 (2013.01); B22F 1/02 (2013.01); C01G 49/0018 (2013.01); C01G 49/0036 (2013.01); C01G 49/0063 (2013.01); C01G 49/0072 (2013.01); C22C 38/00 (2013.01); H01F 1/24 (2013.01); H01F 1/33 (2013.01); H01F 3/08 (2013.01); H01F 41/0246 (2013.01); B22F 1/0011 (2013.01); B22F 1/0096 (2013.01); B22F 3/02 (2013.01); B22F 3/10 (2013.01); B22F 9/026 (2013.01); B22F 9/16 (2013.01); B22F 2003/248 (2013.01); B22F 2009/0824 (2013.01); B22F 2201/02 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); C01P 2002/32 (2013.01); C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); C22C 33/02 (2013.01); C22C 33/0235 (2013.01); C22C 2202/02 (2013.01); H01F 10/20 (2013.01);
Abstract

A powder for dust cores includes an aggregate of soft magnetic particles, each of which includes a soft magnetic metal particle, and a ferrite film that covers a surface of the soft magnetic metal particle and includes ferrite crystal grains having a spinel structure. A diffraction peak derived from the ferrite crystal grains exists in a powder X-ray diffraction pattern. By a method for producing a powder for dust cores, a raw material powder that includes an aggregate of soft magnetic metal particles is prepared. Furthermore, many ferrite fine particles are formed on a surface of each of the soft magnetic metal particles of the raw material powder. Additionally, the ferrite fine particles are coarsely crystallized through heat treatment to form a ferrite film, which includes ferrite crystal grains having a spinel structure, on the surface of the each of the soft magnetic metal particles.

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