Diffusion bonding of gaps
The present invention relates generally to the field of diffusion bonding of cracks and joints in metal substrates, and especially to diffusion bonding for nickel alloy- or cobalt alloy-containing substrates used in the manufacture of, for example, Industrial Gas Turbine, Aeroderivative Gas Turbine...
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| Format | Patent |
| Language | English |
| Published |
18.02.2003
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| Online Access | Get full text |
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| Summary: | The present invention relates generally to the field of diffusion bonding of cracks and joints in metal substrates, and especially to diffusion bonding for nickel alloy- or cobalt alloy-containing substrates used in the manufacture of, for example, Industrial Gas Turbine, Aeroderivative Gas Turbine and Aircraft Gas Turbine components.
A process for diffusion bonding of cracks and other gaps in high-temperature nickel and cobalt alloy components is described. The gap is filled with alloy powder matching the substrate alloy, or with an alloy of superior properties, such as MAR-M 247, MAR-M 247LC, or CM 247LC. A braze containing a melting point depressant is either mixed into the alloy powder or applied over it. The depressant is preferably hafnium, zirconium, or low boron. The component is heated for 15-45 minutes above the melting point of the braze, which fills the spaces between the alloy powder particles. The component is diffused at a temperature above or below the liquidus of the braze and solution heat-treated and aged at a temperature at which the braze and alloy mixture in the gap is solid, but the depressant diffuses away. |
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