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Title:
METALLIC POWDER FOR POWDER MAGNETIC CORE AND PROCESS FOR PRODUCING POWDER MAGNETIC CORE
Document Type and Number:
WIPO Patent Application WO/2008/149825
Kind Code:
A1
Abstract:
A pure iron powder having a diameter of 10 to 500 μm and a purity of not less than 99% by mass is heated to a temperature region of 600°C or above and 1400°C or below. In this temperature region, Si is enriched in a depth range of 5 μm from the surface of the pure iron powder by a gas phase reaction, and the average Si concentration in this depth range is brought to not less than 0.05% by mass and not more than 2% by mass. According to the above constitution, a metallic powder for a powder magnetic core, which has an enhanced bond strength between an insulating material and particles and in its turn has enhanced electrically insulating properties, can be provided without leading a deterioration in compressibility. In the powder magnetic core thus obtained, a high level of saturated magnetic flux density can be maintained, and a low level of iron loss can be realized.

Inventors:
FUJITA, Akira (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
藤田明 (〒11 東京都千代田区内幸町二丁目2番3号JFEスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
HIRATANI, Tatsuhiko (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
Application Number:
JP2008/060092
Publication Date:
December 11, 2008
Filing Date:
May 26, 2008
Export Citation:
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Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 1000011, JP)
JFEスチール株式会社 (〒11 東京都千代田区内幸町二丁目2番3号 Tokyo, 1000011, JP)
FUJITA, Akira (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 1000011, JP)
藤田明 (〒11 東京都千代田区内幸町二丁目2番3号JFEスチール株式会社 知的財産部内 Tokyo, 1000011, JP)
International Classes:
B22F1/00; B22F1/02; B22F3/00; B22F3/24; H01F1/20; H01F41/02
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION7th Floor Yanagiya Building,1-10, Nihonbashi 2-chom, Chuo-ku Tokyo, 103-0027, JP)
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