Method for isothermal brazing of single crystal components
AssigneeAlstom (Switzerland) Ltd
InventorsAlexander Schnell, John Fernihough, Maxim Konter
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Abstract
A process of brazing cracks and gaps in a single crystal article which takes places isothermally under the following conditions: the temperature of the isothermal solidification is between TLiqidus, Braze+5*(wt-%BBraze) and (Tsolidus, base material−70*(wt-%BBraze)), while (wt-%B*wt-%Cr) is between 15 and 40 and (Tsolv.γ′, base material−TLiqidus, Braze) is above 140° C. This results in an homogeneous γ/γ′-microstructure of the isothermal solidified, brazed joint with mechanical properties similar to those of the base material.
Claims15
A method of joining or repairing cracks or gaps in a single crystal article made of a Nickel based superalloy with a brazing alloy comprising at least γ′-phase forming elements and at least boron as melting point depressant, comprising:
- isothermal, epitaxial single crystal solidification of the brazing alloy,
- wherein the Temperature of the isothermal solidification is between
- TLiqidus, Braze +5*(wt-%BBraze) and (Tsolidus, base material−70*(wt-%BBraze)),
- while (wt-%BBraze*wt-%CrBraze) is between 15 and 40 and
- (Tsolv.γ′, base material−TLiqidus, Braze) is above 140° C.
Dependencies are inferred from the claim text.