IRON POWDER AND MIXED POWDER FOR POWDER METALLURGY AND PRODUCTION OF IRON POWDER

Title:

IRON POWDER AND MIXED POWDER FOR POWDER METALLURGY AND PRODUCTION OF IRON POWDER

Document Type and Number:

WIPO Patent Application WO/1994/006588

Kind Code:

A1

Abstract:

An iron powder and mixed powder for powder metallurgy as raw materials for producing sintered mechanical components by adding Cu powder and graphite powder to iron powder and rolling and sintering the mixture, 0.008 to 0.5 wt.% of at least one kind of element selected from elements having a value of oxide standard formation free energy of not greater than 120 kcal/mol o2 at 1,000 �C is contained in the iron powder and not less than 20 % of the element(s) consists of an oxide, while 0.01 to 0.20 wt.% of at least one kind of oxide powder of an element having a value of oxide standard formation free energy of not greater than -120 kcal/mol o2 at 1,000 �C is blended in the mixed powder. In this way, diffusion of C (carbon) from graphite added into iron powder particles is restricted at the time of sintering, and dimensional change accuracy of the sintered product is improved.

Inventors:

OGURA KUNIAKI (JP)
ISHIKAWA HIROYUKI (JP)
OMURA TAKEO (JP)
MAEDA YOSHIAKI (JP)
NITTA MINORU (JP)
OHTUBO HIROSHI (JP)
YOSHII HIROSHI (JP)

Application Number:

PCT/JP1993/001334

Publication Date:

March 31, 1994

Filing Date:

September 17, 1993

Export Citation:

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Assignee:

KAWASAKI STEEL CO (JP)
OGURA KUNIAKI (JP)
ISHIKAWA HIROYUKI (JP)
OMURA TAKEO (JP)
MAEDA YOSHIAKI (JP)
NITTA MINORU (JP)
OHTUBO HIROSHI (JP)
YOSHII HIROSHI (JP)

International Classes:

C22C32/00; C22C33/02; (IPC1-7): B22F1/00; B22F9/22

Foreign References:

JPS56163238A	1981-12-15
JPH01116002A	1989-05-09
JPH01132701A	1989-05-25
JPS63297502A	1988-12-05

Other References: