Method for removing sulfur from superalloy articles to improve their oxidation resistance
摘要
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 DEG 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.
申请公布号
US5346563(A)
申请公布日期
1994.09.13
申请号
US19930047253
申请日期
1993.04.14
申请人
UNITED TECHNOLOGIES CORPORATION
发明人
ALLEN, WILLIAM P.;BORNSTEIN, NORMAN S.;CHIN, STEPHEN;DECRESCENTE, MICHAEL;DUHL, DAVID N.;PARILLE, DONALD R.;PIKE, ROSCOE A.;SMEGGIL, JOHN G.