Braze material for hybrid structures
AssigneeUnited Technologies Corporation
InventorsMario P. Bochiechio, Edward R. Szela, Wangen Lin, Ashwin Raghavan
Life of this patent
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Abstract
A nickel braze alloy may include less than about 2.0 wt. % aluminum, about 18.0-23.0 wt. % cobalt, about 12.0-15.0 wt. % chromium, about 3.8-4.5 wt. % molybdenum, about 0.8-1.5 wt. % niobium, about 1.8-3.0 wt. % tantalum, less than about 2.0 wt. % titanium, about 2.0-3.5 wt. % tungsten, about 0.8-1.2 wt. % boron, about 0.02-0.10 wt. % carbon, about 0.03-0.06 wt. % zirconium, and a balance of nickel and minor amounts of impurities.
Claims17
A nickel braze alloy comprising in combination less than about 2.0 wt. % aluminum, about 18.0-23.0 wt. % cobalt, about 12.0-15.0 wt. % chromium, about 3.8-4.5 wt. % molybdenum, about 0.8-1.5 wt. % niobium, about 1.8-3.0 wt. % tantalum, less than about 2.0 wt. % titanium, about 2.0-3.5 wt. % tungsten, about 0.8-1.2 wt. % boron, about 0.02-0.10 wt. % carbon, about 0.03-0.06 wt. % zirconium, and a balance of nickel and minor amounts of impurities.
A method of joining a first superalloy component with a first joining surface to a second superalloy component with a second joining surface along the matching joining surfaces comprises:
- forming an assembly wherein the first component and the second component are positioned such that the first and second joining surfaces are facing each other with a layer of transient liquid phase brazing alloy therebetween having the following composition:
- less than about 2.0 wt. % aluminum, about 18.0-23.0 wt. % cobalt, about 12.0-15.0 wt. % chromium, about 3.8-4.5 wt. % molybdenum, about 0.8-1.5 wt. % niobium, about 1.8-3.0 wt. % tantalum, less than about 2.0 wt. % titanium, about 2.0-3.5 wt. % tungsten, about 0.8-1.2 wt. % boron, about 0.02-0.10 wt. % carbon, about 0.03-0.06 wt. % zirconium, and a balance of nickel and minor amounts of impurities on the first and/or second joining surfaces;
- heating the assembly to a predetermined temperature such that the transient liquid phase brazing alloy melts and the first and second superalloy joining surfaces do not melt;
- and
- holding the assembly at the predetermined temperature for a predetermined amount of time wherein the brazing alloy isothermally solidifies and forms a metallurgical bond between the first and second superalloy components.
Dependencies are inferred from the claim text.