Title:
COMPACT RAW MATERIAL OF METALLIC POWDER AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3871781
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a compact raw material, containing prescribed amounts of graphite, suitable for producing machine parts of high mechanical strength by a sintered metal, having properties of high elongation and low hardness, and also having excellent deformability.
SOLUTION: In a compacting stage 1, a metallic powder, prepared by mixing ≥0.3 wt.% graphite with a metal powder composed essentially of iron, is compacted to obtain a preform of ≥7.3 g/cm3 density. In a sintering stage 2, the preform is presintered at prescribed temp. to obtain the compact raw material having a structure in a state where the graphite remains in the grain boundaries of the metal powder.
Inventors:
Takashi Yoshimura
Hiroyuki Yasuma
Masashi Fujinaga
Hiroyuki Yasuma
Masashi Fujinaga
Application Number:
JP29637797A
Publication Date:
January 24, 2007
Filing Date:
October 14, 1997
Export Citation:
Assignee:
株式会社日立製作所
JFEスチール株式会社
JFEスチール株式会社
International Classes:
B30B11/02; C22C33/02; B22F3/00; B22F3/02; B22F3/03; B22F3/035; B22F3/10; B22F3/16; B22F3/17; (IPC1-7): B22F3/00; B22F3/02; B22F3/10; B30B11/02
Domestic Patent References:
| JP62202046A | ||||
| JP9287005A | ||||
| JP7173504A |
Attorney, Agent or Firm:
Teruo Aoki