Title:
【発明の名称】粉末冶金用の鉄粉および混合粉ならびに鉄粉の製造方法
Document Type and Number:
Japanese Patent JP3273789
Kind Code:
B2
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 DEG 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 DEG 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.
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Inventors:
Kuniaki Ogura
Hiroyuki Ishikawa
Takeo Ohmura
Yoshiaki Maeda
Minoru Nitta
Hiroshi Ohtsubo
Yutaka Yoshii
Hiroyuki Ishikawa
Takeo Ohmura
Yoshiaki Maeda
Minoru Nitta
Hiroshi Ohtsubo
Yutaka Yoshii
Application Number:
JP50797294A
Publication Date:
April 15, 2002
Filing Date:
September 17, 1993
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
C22C32/00; C22C33/02; (IPC1-7): B22F1/00; B22F9/22
Domestic Patent References:
| JP56163238A | ||||
| JP49110512A |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)