Methods for sintering powder metallurgy parts

Details Methods for sintering powder metallurgy parts Methods for sintering powder metallurgy parts

1977-05-18

1978-08-15

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75224, 148 16, 252373, 252374, B22F 300

Patent

active

041069315

ABSTRACT:
Steel powder metallurgy parts having approximately 0.2 to 10% carbon in the form of graphite and approximately 1% lubricant are sintered in the hot zone of a furnace under temperatures of approximately 2050.degree. F for periods of up to approximately 1.0 hour under an atmosphere comprised of at least 90% nitrogen, up to 9.75% hydrogen and carbon monoxide with a maximum 5% carbon monoxide, 0.25-2.0% methane or equivalent hydrocarbon and a dewpoint of the mixed atmosphere of less than -60.degree. F.

REFERENCES:
patent: 2299138 (1942-10-01), Gier
patent: 2333573 (1943-11-01), Kalischer
patent: 2411073 (1946-11-01), Whitney
patent: 3891473 (1975-06-01), Latra
patent: 3986900 (1976-10-01), Rademacher
patent: 4049472 (1977-09-01), Arndt
patent: 4057510 (1977-11-01), Crouch et al.
Hausner, H. H. handbook of Powder Metallurgy, Chemical Pub. Co., N.Y., 1973, pp. 190, 193.
Hirschhorn, J. S. Intro. to Powder Met. Am. Powd. Met. Inst., N.Y. 1969, pp. 216-231.
Goetzel, C. G. Treatise on Powder Met. vol. I. Interscience, N.Y. 1949. pp. 621-649.

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