METHOD FOR PRODUCING SOFT MAGNETIC DUST CORE, AND SOFT MAGNETIC DUST CORE

Title:

METHOD FOR PRODUCING SOFT MAGNETIC DUST CORE, AND SOFT MAGNETIC DUST CORE

Document Type and Number:

WIPO Patent Application WO/2017/022227

Kind Code:

A1

Abstract:

Provided is a soft magnetic dust core having high density and high characteristics. A method for producing a soft magnetic dust core, wherein: a coated powder, which contains an amorphous powder composed of an Fe-B-Si-P-C-Cu system alloy, an Fe-B-P-C-Cu system alloy, an Fe-B-Si-P-Cu system alloy or an Fe-B-P-Cu system alloy and having a first crystallization initiation temperature Tx1 and a second crystallization initiation temperature Tx2 and a coating formed on the surface of the amorphous powder, is prepared; and a molding pressure is applied to the coated powder at a temperature of Tx1 - 100 K or less, and the coated powder is heated to the maximum temperature that is Tx1 - 50 K or more but less than Tx2, while applying the molding pressure thereto.

Inventors:

NAKAMURA NAOMICHI (JP)
NAKASEKO MAKOTO (JP)
TAKASHITA TAKUYA (JP)
MURAKI MINEO (JP)
TERAO HOSHIAKI (JP)
WADA RAITA (JP)
URATA AKIRI (JP)
KANAMORI YU (JP)
YAMAKI MAKOTO (JP)
OKAMOTO KOICHI (JP)
TSUDA TOSHINORI (JP)
SATO SYOICHI (JP)
OZAKI KIMIHIRO (JP)

Application Number:

PCT/JP2016/003512

Publication Date:

February 09, 2017

Filing Date:

July 28, 2016

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
JFE PREC CORP (JP)
NEC TOKIN CORP (JP)
NAT INST ADVANCED IND SCIENCE & TECH (JP)

International Classes:

H01F41/02; B22F1/00; B22F1/08; B22F1/102; B22F1/16; B22F3/00; B22F3/02; C22C38/00; C22C45/02; H01F1/153; H01F1/22; H01F27/255

Foreign References:

JP2004204296A	2004-07-22
JP2012136770A	2012-07-19
JP2009174034A	2009-08-06
JPH11256202A	1999-09-21
JP2015084353A	2015-04-30
JP2010118486A	2010-05-27

Other References: