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Title:
IRON/COPPER COMPOSITE POWDER FOR POWDER METALLURGY AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/059855
Kind Code:
A1
Abstract:
An iron/copper composite powder for powder metallurgy comprising a copper-coated iron powder as a major component. The composite powder comprises a copper-coated iron powder or a powder mixture of a copper-coated iron powder and an electrolytic copper powder, and is characterized by having a copper content of 45-70 wt.%, apparent density of 2.2 g/cm3 or higher, and fluidity of 25 s/50 g or lower. Also provided is a process for producing an iron/copper composite powder for powder metallurgy comprising a copper-coated iron powder as a major component, characterized by plating an iron powder with copper, sintering this copper-coated iron powder alone having a copper content of 45-70 wt.% or a mixture prepared by mixing the copper-coated iron powder with an electrolytic copper powder so as to result in a copper content of 45-70 wt.%, and pulverizing the sinter. By the process for producing a raw powder for powder metallurgy which comprises copper-coated iron as a major component and is for use in producing, e.g., a sintered oil-impregnated bearing, a raw sintering powder is obtained which is improved in flowability and apparent density and in sinter properties including ring compression strength. A cost reduction is also attained.

Inventors:
NARUSAWA, Yasushi (Ltd. Shirogane Plant 3-3-1 Shirogane-cho, Hitachi-cit, Ibaraki 56, 3170056, JP)
Application Number:
JP2007/072068
Publication Date:
May 22, 2008
Filing Date:
November 14, 2007
Export Citation:
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Assignee:
Nippon Mining & Metals Co., Ltd. (10-1, Toranomon 2-chome Minato-k, Tokyo 01, 1050001, JP)
日鉱金属株式会社 (〒01 東京都港区虎ノ門二丁目10番1号 Tokyo, 1050001, JP)
International Classes:
B22F1/02; B22F1/00; C22C9/00
Foreign References:
JP2002348601A2002-12-04
JPS6179706A1986-04-23
JPS6179707A1986-04-23
JPS4888053A1973-11-19
Attorney, Agent or Firm:
OGOSHI, Isamu (OGOSHI International Patent Office Daini-Toranomon Denki Bldg, 5F 3-1-10 Toranomon, Minato-k, Tokyo 01, 1050001, JP)
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