Method for producing ferrous sintered alloy having quenched stru

Details Method for producing ferrous sintered alloy having quenched stru Method for producing ferrous sintered alloy having quenched stru

1996-09-23

1997-10-28

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 25, 419 38, 419 46, 75246, B22F 312

Patent

active

056825889

ABSTRACT:
The present invention relates to a method for producing, without quench-hardening process, a ferrous sintered alloy having satisfactory strength which is equal to that of the conventional ferrous sintered quenched material, and the method comprises the steps of: preparing a powder mixture by adding, in weight ratios, 1 to 2% of copper powder, 1 to 3% of Ni powder, and graphite to a ferrous alloy powder consisting of 3 to 5% of Ni, 0.4 to 0.7% of Mo, and the remainder Fe, the quantity of said graphite being determined such that the C-content after sintering is 0.2 to 0.7%; compacting said powder mixture in a tool to form a green compact; sintering said green compact in a non-oxidizing atmosphere at a temperature in the range of 1130.degree. to 1230.degree. C.; and cooling the sintered product in the sintering furnace at a rate of 5.degree. C./min. to 20.degree. C./min.

REFERENCES:
patent: 5458670 (1995-10-01), Ogura et al.
patent: 5476534 (1995-12-01), Ogura et al.
patent: 5476632 (1995-12-01), Shivanath et al.
patent: 5489324 (1996-02-01), Takahashi et al.

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