Cobalt-base composition and method for diffusion braze repair of superalloy articles
This invention relates generally to diffusion braze repair of superalloy articles and more particularly to cobalt-base braze alloy compositions containing at least one of the following elements: rhenium, palladium, platinum, ruthenium, iridium; and to long term diffusion heat treatment of repaired s...
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Main Author | |
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Format | Patent |
Language | English |
Published |
02.04.2002
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Online Access | Get full text |
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Summary: | This invention relates generally to diffusion braze repair of superalloy articles and more particularly to cobalt-base braze alloy compositions containing at least one of the following elements: rhenium, palladium, platinum, ruthenium, iridium; and to long term diffusion heat treatment of repaired superalloy articles.
An improved cobalt-base braze alloy composition is provided for use in repairing superalloy articles, such as gas turbine engines, power generation turbines, refinery equipment, and heat exchangers. The improved cobalt-base braze alloy composition includes nickel; at least one element selected from the group of rhenium, palladium, platinum, ruthenium, and iridium; at least one element selected from the group of boron and silicon; and the remaining balance consists of cobalt. This composition may also include aluminum and/or one or more rare earth/lanthanide series elements, and the composition may be combined with one or more powdered base metal superalloy compositions to form an improved diffusion braze alloy mixture. The compositions according to the present invention enable a repair composite formed of such compositions to at least equal the mechanical, environmental, and processing properties of the superalloy base metal being repaired. |
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