Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1985-12-05
1987-09-15
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
419 28, 419 29, 419 33, 419 36, 419 37, 419 39, 419 46, 419 54, B22F 100
Patent
active
046938648
ABSTRACT:
Mill scale, iron ore, or taconite is utilized in a powder metallurgy process to form steel articles having approximately the same density as that of conventional rolled steel. Particulate iron is mixed with manganese, carbon, additional alloying ingredients, and a binder to form a particulate admixture. The particulate admixture is then compressed, preferably under extreme pressure until the density of the compressed particulate admixture is from about 0.2408 lbs/in.sup.3 (6.67 g/cm.sup.3) to about 0.2833 lbs/in.sup.3 (7.83 g/cm.sup.3), which corresponds to a density of from about 85% to about 100% of the density of conventional rolled steel. The resultant coherent mass is subjected to sintering and below fusion heating to form an alloyed article which can be swaged, rolled, drawn, or worked at elevated temperature to decrease the grain size of the alloyed article. The resultant end-product will preferably have a density of from about 0.2408 lbs/in.sup.3 (6.67 g/cm.sup.3) to about 0.2833 lbs/in.sup.3 (7.83 g/cm.sup.3), more preferably from about 0.2550 lbs/in.sup.3 (7.05 g/cm.sup.3) to about 0.2833 lbs/in.sup.3 (7.83 g/cm.sup.3), and most preferably about the same density as rolled steel produced by conventional means, i.e., about 0.2833 lbs/in.sup.3 (7.83 g/cm.sup.3). By using additional alloying ingredients, alloys having any desired composition and property may be produced.
REFERENCES:
patent: 4089681 (1978-05-01), Gueussier
patent: 4306901 (1981-12-01), Szekely et al.
Donald W. Lloyd Realty, Inc.
Lechert Jr. Stephen J.
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