Turbine component with a thin interior partition
A hollow turbine airfoil or a hollow turbine casting including a cooling passage partition. The cooling passage partition is formed from a single crystal grain structure nickel based super alloy, a cobalt based super alloy, a nickel-aluminum based alloy, or a coated refractory metal.
1 . A method for fabricating a hollow turbine airfoil comprising:
forming a cooling passage partition separately from the hollow turbine airfoil, the cooling passage partition comprising a spiral cast sheet of a single crystal grain structure nickel based super alloy, the spiral cast sheet of the single crystal grain structure nickel based super alloy having a single crystal grain structure direction parallel to a direction of solidification of the spiral cast sheet of the single crystal grain structure nickel based super alloy;
solution heat treating the spiral cast sheet of the single crystal grain structure nickel based super alloy;
spiral cutting the spiral cast sheet to length; and
positioning the cooling passage partition with respect to the hollow turbine airfoil;
wherein the cooling passage partition has a maximum thickness of less than or equal to 8 mils (0.2 millimeters); and
wherein the cooling passage partition has bleed holes, a sinusoidal shape, raised features and holes, a helical configuration, or a combination thereof.
2 . The method of claim 1 , wherein forming the cooling passage partition comprises rolling the spiral cast sheet of the single crystal grain structure nickel based super alloy.
3 . The method of claim 1 , wherein forming the cooling passage partition comprises an intermediate annealing treatment.
4 . The method of claim 1 , wherein forming the cooling passage partition comprises a post-heat treatment.
5 . The method of claim 1 , wherein positioning the cooling passage partition with respect to the hollow turbine airfoil comprises attaching the cooling passage partition with respect to the hollow turbine airfoil.
6 . The method of claim 1 , wherein the hollow turbine airfoil is a vane or a blade.
7 . The method of claim 1 , wherein the hollow turbine airfoil comprises a monolithic ceramic airfoil or a ceramic matrix composite airfoil.
8 . A method for fabricating a hollow turbine casting comprising:
forming a cooling passage partition separately from the hollow turbine casting, the cooling passage partition comprising a spiral cast sheet of a single crystal grain structure nickel based super alloy, the spiral cast sheet of the single crystal grain structure nickel based super alloy having a single crystal grain structure direction parallel to a direction of solidification of the spiral cast sheet of the single crystal grain structure nickel based super alloy;
solution heat treating the cast sheet of the single crystal grain structure nickel based super alloy;
spiral cutting the spiral cast sheet to length; and
positioning the cooling passage partition with respect to the hollow turbine casting;
wherein the cooling passage partition has a maximum thickness of less than or equal to 8 mils (0.2 millimeters); and
wherein the cooling passage partition has bleed holes, a sinusoidal shape, raised features and holes, a helical configuration, or a combination thereof.
9 . The method of claim 8 , wherein forming the cooling passage partition comprises rolling the spiral cast sheet of the single crystal grain structure nickel based super alloy.
10 . The method of claim 8 , wherein forming the cooling passage partition comprises an intermediate annealing treatment.
11 . The method of claim 8 , wherein forming the cooling passage partition comprises a post-heat treatment.
12 . The method of claim 8 , wherein positioning the cooling passage partition with respect to the hollow turbine casting comprises attaching the cooling passage partition with respect to the hollow turbine casting.
13 . The method of claim 8 , wherein the hollow turbine casting is a vane or a blade.
14 . The method of claim 8 , wherein the hollow turbine casting comprises a monolithic ceramic material or a ceramic matrix composite material.