Compressed powder magnetic core, powder for magnetic core, and production methods therefor

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United States of America Patent

PATENT NO 11679437
APP PUB NO 20210210258A1
SERIAL NO

16755858

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A dust core that can significantly reduce the iron loss is provided. The dust core of the present invention includes soft magnetic particles comprising pure iron or an iron alloy and a grain boundary layer existing between adjacent soft magnetic particles. The grain boundary layer has a compound layer comprising MxFe2-xSiO4 (0≤x≤1, M: one or more types of metal elements that serve as divalent cations). Such a dust core is obtained by annealing a compact. The compact is obtained by compression-molding a powder for magnetic cores. In the powder for magnetic cores, coating layers that coat the surfaces of soft magnetic particles are each composed of a composite phase in which spinel-type ferrite represented by MyFe3-yO4 (0≤y≤1, M: one or more types of metal elements that serve as divalent cations) is dispersed on a surface of a silicone resin or inside the silicone resin. The dust core after annealing exhibits a high specific resistance due to the grain boundary layer having the compound layer and can reduce both the eddy-current loss and the hysteresis loss.

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Patent Owner(s)

  • DENSO CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hwang, Jung Hwan Nagakute, JP 115 402
Matsubara, Ken Kariya, JP 103 908
Mitomi, Masataka Kariya, JP 2 0
Utsuno, Seishi Nagakute, JP 5 1

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