Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Patent
1995-06-01
1996-04-16
Kastler, Scott
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
75246, 75255, B22C 100
Patent
active
055078532
ABSTRACT:
This invention is to control the diffusion of C (carbon) from added graphite to particles of iron powder in the sintering to thereby improve the accuracy of dimensional change in the sintered body by using iron powder for powder metallurgy and a mixed powder thereof as a starting material in the production of sintered mechanical parts by adding the iron powder with Cu powder and graphite powder and companying and sintering them, in which 0.008-0.5 wt % in total of at least one element having a value of standard free energy of formation of oxide at 1000.degree. C. of not more than -120 kcal/l mol of O.sub.2 is included in the iron powder and not less than 20% of the element is rendered into an oxide, or 0.01-0.20 wt % in total of an oxide powder of at least one element having a value of standard free energy of formation of oxide at 1000.degree. C. of not more than -120 kcal/l mol of O.sub.2 is added to the mixed powder.
REFERENCES:
patent: 4518427 (1985-05-01), Tengzelius et al.
patent: 4799955 (1989-01-01), McClellan
Ishikawa Hiroyuki
Maeda Yoshiaki
Nitta Minoru
Ogura Kuniaki
Ohtsubo Hiroshi
Kastler Scott
Kawasaki Steel Corporation
Miller Austin R.
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