Method for removing sulfur from superalloy articles to improve their oxidation resistance

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United States of America Patent

PATENT NO 5346563
SERIAL NO

08047253

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Abstract

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Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present on the article surface. The heat treatment is best carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out within the range defined by the incipient melting temperature of the article and about 150.degree. C. below the incipient melting temperature of the article. At such temperatures the foreign chemical species reacts with and modifies the oxide film on the article surface. Sulfur is then able to diffuse through such modified film, and a more oxidation resistant component is produced.

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Patent Owner(s)

Patent OwnerAddress
SOHL CHARLES EPRATT & WHITNEY PATENT DEPT - MS 132-13 OBG 2 400 MAIN STREET E HARTFORD CT 06108

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Allen, William P Portland, CT 10 221
Bornstein, Norman S West Hartford, CT 16 205
Chin, Stephen Wallingford, CT 25 676
DeCrescente, Michael Wethersfield, CT 1 25
Duhl, David N Newington, CT 21 474
Parille, Donald R South Windsor, CT 6 97
Pike, Roscoe A Granby, CT 22 287
Smeggil, John G Simsbury, CT 33 594

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