Hi-density forming process

Details Hi-density forming process Hi-density forming process

1996-05-15

1998-05-19

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 11, B22F 312

Patent

active

057549370

ABSTRACT:
A method for making a high density powdered metal article is provided. The composition consists of iron based powder, lubricant, graphite and ferro alloy additions. The composition is compacted in rigid tools at ambient temperature, sintered at high temperature and then formed in rigid tools at 40 to 90 tons per square inch to a density greater than 94% of theoretical. The high density article is then annealed. The final article demonstrates remarkable mechanical properties which are atypical of powdered metal components and approach those of wrought steel.

REFERENCES:
patent: 5019156 (1991-05-01), Naya et al.
patent: 5178691 (1993-01-01), Yamashita et al.
patent: 5427660 (1995-06-01), Kamimura et al.
patent: 5476632 (1995-12-01), Shivanath et al.
Yoshiaki Itoh et al in the SAE Technical Paper Series, given at the International Congress and Exposition in Detroit, Michigan on Feb. 27-Mar. 3/1989 entitled "Inmprovement of the Rolling Contact Fatigue Strength of Sintered Steel for Transmission Component".

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