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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 10497500 B1

PDFFull Text
Date of Patent:
Dec. 03, 2019

Filed:

Sep. 04, 2015

Powder magnetic core, powder for magnetic cores, and methods of manufacturing them

Applicant:

Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;

Inventors:

Masashi Ohtsubo, Nagakute, JP;

Masaaki Tani, Nagakute, JP;

Takeshi Hattori, Nagakute, JP;

Jung hwan Hwang, Nagakute, JP;

Masashi Hara, Nagakute, JP;

Shin Tajima, Nagakute, JP;

Naoki Iwata, Toyota, JP;

Shinjiro Saigusa, Toyota, JP;

Kohei Ishii, Nagoya, JP;

Daisuke Okamoto, Toyota, JP;

Toshimitsu Takahashi, Toyota, JP;

Assignee:

TOYOTA JIDOSHA KABUHIKI KAISHA, Toyota-shi, Aichi-ken, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

C Melissa Koslow

Int. Cl.
CPC ...
H01F 3/08 (2006.01); H01F 1/147 (2006.01); H01F 1/24 (2006.01); B22F 1/02 (2006.01); C03C 8/02 (2006.01); C03C 8/04 (2006.01); C03C 8/08 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
H01F 3/08 (2013.01); B22F 1/02 (2013.01); C03C 8/02 (2013.01); C03C 8/04 (2013.01); C03C 8/08 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); H01F 1/147 (2013.01); H01F 1/14791 (2013.01); H01F 1/24 (2013.01); H01F 41/0246 (2013.01); C03C 2209/00 (2013.01);
Abstract

A powder magnetic core having excellent specific resistance or strength. The powder magnetic core has soft magnetic particles, first coating layers that coat the surfaces of the soft magnetic particles and include aluminum nitride, and second coating layers that coat at least a part of the surfaces of the first coating layers and include a low-melting-point glass having a softening point lower than an annealing temperature for the soft magnetic particles. The first coating layers including aluminum nitride are excellent in the wettability to the low-melting-point glass which constitutes the second coating layers and suppress diffusion of constitutional elements between the soft magnetic particles and the low-melting-point glass of the second coating layers. The powder magnetic core can stably exhibit a higher specific resistance and higher strength than the prior art owing to such a synergistic action of the first coating layers and second coating layers.

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