Method of sintering an injection-molded article

Details Method of sintering an injection-molded article Method of sintering an injection-molded article

1988-01-22

1989-06-06

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

264 65, 419 37, 419 53, 419 54, 419 57, 419 58, B22F 100

Patent

active

048369802

ABSTRACT:
In a method of sintering an injection-molded article of raw material powder and organic binder, the injection-molded article already debinderized is initially heated up to a certain reaction temperature at which residual binder is removed from it. In subsequent decarburizing step, the residual binder is removed from the molded article under atmospheric or reduced pressure, while being supplied with H.sub.2 gas. Thereafter, in a reducing and sintering step, the molded article is heated up to a sintering temperature and is held at this temperature under reduced pressure for a predetermined period, with H.sub.2 gas being supplied. H.sub.2 content of the atmosphere in the decarburizing step is kept higher than that in the reducing and sintering step.

REFERENCES:
patent: 4604259 (1986-08-01), Whitman
patent: 4608225 (1986-08-01), Sakaramoto et al.
patent: 4622068 (1986-11-01), Rowe et al.
patent: 4637900 (1987-01-01), Frederickson
patent: 4722826 (1988-02-01), Poole

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