METALLIC POWDER MOLDING MATERIAL AND ITS RE-COMPRESSION MOLDED BODY AND SINTERED BODY OBTAINED FROM THE RE-COMPRESSION MOLDED BODY AND PRODUCTION METHODS THEREOF

Title:

METALLIC POWDER MOLDING MATERIAL AND ITS RE-COMPRESSION MOLDED BODY AND SINTERED BODY OBTAINED FROM THE RE-COMPRESSION MOLDED BODY AND PRODUCTION METHODS THEREOF

Document Type and Number:

WIPO Patent Application WO/2000/062960

Kind Code:

A1

Abstract:

A re-compression molded body of a metallic powder molding material having an excellent deformability suitable for obtaining high-mechanical-strength mechanical parts made from sintered metals and a sintered body obtained from the re-compression molded body, and production methods thereof comprising the following steps: In a preforming process (1), metallic powder (7), obtained by mixing metal powder (7a) mainly containing iron with preferably at least 0.1 wt.%, more preferably at least 0.3 wt.% of graphite (7b), is compact-pressed to form a preform (8) with a density of at least 7.3 g/cm?3¿. In a temporary sintering process (2), the preform (8) is temporarily sintered at a preset temperature to form a metallic powder molding material (9) having a structure in which graphite still remains in a metal powder grain boundary. In a re-compression process (3), the metallic powder molding material (9) is re-compression-molded to obtain a re-compression molded body (10). In a re-sintering process (4), the re-compression-molded body (10) is re-sintered to obtain a sintered body (11). In a heat treating process (5), the sintered body (11) is heat-treated to obtain a heat-treated sintered body (11).

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Inventors:

YOSHIMURA TAKASHI (JP)
AMMA HIROYUKI (JP)
FUJINAGA MASASHI (JP)
IIJIMA MITSUMASA (JP)
HATAI YASUO (JP)
MATSUMOTO TAKAYUKI (JP)
UENOSONO SATOSHI (JP)
UNAMI SHIGERU (JP)

Application Number:

PCT/JP2000/001615

Publication Date:

October 26, 2000

Filing Date:

March 17, 2000

Export Citation:

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Assignee:

UNISIA JECS CORP (JP)
KAWASAKI STEEL CO (JP)
YOSHIMURA TAKASHI (JP)
AMMA HIROYUKI (JP)
FUJINAGA MASASHI (JP)
IIJIMA MITSUMASA (JP)
HATAI YASUO (JP)
MATSUMOTO TAKAYUKI (JP)
UENOSONO SATOSHI (JP)
UNAMI SHIGERU (JP)

International Classes:

C22C33/02; (IPC1-7): B22F3/02

Foreign References:

JPH0949064A	1997-02-18
JPH0949062A	1997-02-18
JPH0949061A	1997-02-18
JPH0949047A	1997-02-18
JPH08144027A	1996-06-04
JPH08144026A	1996-06-04
JPH07173504A	1995-07-11

Other References: