Avco Corporation

Michael A Iovene

Jule A Miller

Jack W Lee

Charles Berger

Nickel-base superalloy composition for the repair, coating or rebuilding of the surface of a superalloy substrate, such as a single crystal nickel-base superalloy, to impart thereto surface areas having improved high temperature properties such as hot corrosion resistance. The present compositions are applied by low heat-input welding processes, such as laser welding or plasma arc welding, and are formulated to provide hot corrosion resistance properties and yet to have good weldability properties. The composition contains, by weight percentages, 2-12.5 Cr, 6-17 Cr, 0.5-7 Mo, 0.5-4 Ta, 2.5-9.5 Al, 1-4 Re, 1.5-8.5 W, 0.01-2.5 Nb, 0.5-6 Ti, 0.01-0.7 Yt, 0.02-3.5 Hf, and balance Ni.

Nickel-base superalloy compositions

A method of repairing damages in a superalloy component is disclosed wherein existing brazed joints and protective coatings are not harmed. The method entails the use of a silicon-free metal mixture comprising (i) a low melting alloy having a liquidus below the temperature to be used to deposit the metal mixture, (ii) an alloy melting above about 2100.degree. F., and (iii) optionally nickel. The resultant repair has a solidus temperature of at least 1950.degree. F., preferably at least 2000.degree..

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Woodbridge, CT, United States of America

Michael A Iovene