Metal fusion bonding – Process – Repairing – restoring – or renewing product for reuse
Patent
1996-10-22
1998-04-07
Ramsey, Kenneth J.
Metal fusion bonding
Process
Repairing, restoring, or renewing product for reuse
228194, 2282481, B23K 3514, B23K 1008
Patent
active
057354480
ABSTRACT:
A repair coating for superalloy articles, such as gas turbine engine components, includes a volatile organic carrier or water-based carrier, a fluxing agent, a thickening agent, balance a filler mix. The filler mix consists of at least two distinct particulate components. The mix includes a first particulate component having a composition which approximates that of the article being repaired. The mix also includes a second particulate component having a composition approximating that of the article and a melting point depressant, such as boron. This melting point depressant is substantially in excess of that in the article and sufficient to provide melting of a portion of the mix at a processing temperature below the melting temperature of the article. The above filler mix is blended with the other constituents to form the repair coating which is applied to an article. A series of heating/cooling cycles is performed to ensure that the repair cooling properly melts, wets, and bonds to the article and that the melting point depressant diffuses into the article.
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Armstrong Wayne K.
Draghi Peter J.
Pietruska Norman
Ramsey Kenneth J.
United Technologies Corporation
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