Method for making high strength injection molded ferrous materia

Details Method for making high strength injection molded ferrous materia Method for making high strength injection molded ferrous materia

1992-07-15

1994-01-11

Nelson, Peter A.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Plural heating steps including sintering

419 65, B22F 310, B22F 322

Patent

active

052778673

ABSTRACT:
The present invention presents a method of processing ferrous powder materials to produce high strength small component parts suitable for use in miniaturized electrical and electronic equipment. The processing steps involve, in part, mixing with a binder, dewaxing or presintering at a temperature higher than in the conventional dewaxing process, and final sintering at a temperature lower than the conventional sintering process to produce parts having density values of over 96% theoretical density and high mechanical strength properties in a shorter sintering time than the conventional processing method.

REFERENCES:
patent: 3411902 (1968-11-01), Krock et al.
patent: 4492671 (1985-01-01), Ruano et al.
patent: 4826546 (1989-05-01), Yamamoto et al.
patent: 4867943 (1989-09-01), Kiyota
patent: 4885133 (1989-12-01), Fujii
Derwent Publications Ltd., London, GB; AN 91-159582 & JP-A-3 094 045 (Brother Ind KK) Apr. 18, 1991.

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