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Title:
MAGNETIC CORE POWDER, MAGNETIC CORE AND COIL PARTS USING SAME, AND METHOD FOR MANUFACTURING MAGNETIC CORE POWDER
Document Type and Number:
WIPO Patent Application WO/2020/040250
Kind Code:
A1
Abstract:
Provided is a magnetic core powder comprising: an Fe-based crystalline magnetic metal material granular powder A; and an Fe-based crystalline magnetic metal material granular powder B. In a cumulative distribution curve representing the relationship between particle size and cumulative frequency from the small particle size side as determined by laser diffraction, the particle size d50A corresponding to 50 vol% of the cumulative frequency of the granular powder A is 0.5-7.0 µm, the particle size d50B corresponding to 50 vol% of the cumulative frequency of the granular powder B is greater than 15.0 µm, and (d90M-d10M)/d50M is 1.6-6.0, where d10M is the particle size corresponding to 10 vol% of the cumulative frequency of the magnetic core powder, d50M is the particle size corresponding to 50 vol% of the cumulative frequency of the magnetic core powder, and d90M is the particle size corresponding to 90 vol% of the cumulative frequency of the magnetic core powder.

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Inventors:
KATO TETSURO (JP)
CHIWATA NOBUHIKO (JP)
OHTA MOTOKI (JP)
Application Number:
PCT/JP2019/032807
Publication Date:
February 27, 2020
Filing Date:
August 22, 2019
Export Citation:
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Assignee:
HITACHI METALS LTD (JP)
International Classes:
B22F1/052; B22F1/08; B22F3/00; H01F1/153; H01F27/255; B22F9/08; C22C38/00; C22C45/02
Domestic Patent References:
WO2016185940A12016-11-24
Foreign References:
JP2001196216A2001-07-19
JP2007134381A2007-05-31
JP2010118486A2010-05-27
JP2017108098A2017-06-15
JP2014136807A2014-07-28
Other References:
See also references of EP 3842168A4
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
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