Invention Application
- Patent Title: POWDER MAGNETIC CORE, POWDER FOR MAGNETIC CORES, AND METHODS OF MANUFACTURING THEM
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Application No.: US15500957Application Date: 2015-09-04
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Publication No.: US20170263359A1Publication Date: 2017-09-14
- Inventor: Masashi OHTSUBO , Masaaki TANI , Takeshi HATTORI , Jung hwan HWANG , Masashi HARA , Shin TAJIMA , Naoki IWATA , Shinjiro SAIGUSA , Kohei ISHII , Daisuke OKAMOTO , Toshimitsu TAKAHASHI
- Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Applicant Address: JP Toyota-shi, Aichi-ken
- Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Current Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Current Assignee Address: JP Toyota-shi, Aichi-ken
- Priority: JP2014-182709 20140908
- International Application: PCT/JP2015/075209 WO 20150904
- Main IPC: H01F3/08
- IPC: H01F3/08 ; H01F41/02 ; B22F1/02 ; C03C8/02 ; C22C38/06 ; C03C8/04 ; C03C8/08 ; H01F1/147 ; C22C38/02

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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