Title:
POWDER FOR DUST CORES, METHOD FOR PRODUCING SAME, DUST CORE AND METHOD FOR PRODUCING DUST CORE
Document Type and Number:
WIPO Patent Application WO/2017/110545
Kind Code:
A1
Abstract:
This powder (1) for dust cores is an assembly of soft magnetic particles (2), each of which comprises a soft magnetic metal particle (21) and a ferrite coating film (22) that covers the surface of the soft magnetic metal particle (21). The ferrite coating film (22) is configured of ferrite crystal grains (221) having a spinel structure; and a diffraction peak (101) ascribed to the ferrite crystal grains (221) is present in a powder X-ray diffraction pattern (10). Meanwhile, according to a method for producing a powder for dust cores of the present invention, a starting material powder (3), which is configured from an assembly of soft magnetic metal particles (21), is prepared; a plurality of ferrite fine particles (220) are formed on the surface of each soft magnetic metal particle (21) of the starting material powder (3); and the ferrite fine particles (220) are coarse-crystallized by means of a heat treatment so that a ferrite coating film (22), which is configured of ferrite crystal grains (221) having a spinel structure, is formed on the surface of each soft magnetic metal particle (21).
Inventors:
MATSUBARA KEN (JP)
HWANG JUNG HWAN (JP)
UTSUNO SEISHI (JP)
HWANG JUNG HWAN (JP)
UTSUNO SEISHI (JP)
Application Number:
PCT/JP2016/086867
Publication Date:
June 29, 2017
Filing Date:
December 12, 2016
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H01F1/20; B22F1/00; B22F1/16; B22F3/00; H01F1/24; H01F1/33
Foreign References:
| JP2005064396A | 2005-03-10 | |||
| JP2014060183A | 2014-04-03 | |||
| JP2005303132A | 2005-10-27 |
Attorney, Agent or Firm:
JIN Shunji (JP)
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