Turbine blade squealer tip

Abstract

A turbine blade having a squealer tip coupled to a radially outer end of the turbine blade that is usable in a gas turbine engine is disclosed. The squealer tip may require less cooling air and may therefore be more efficient than conventional configurations. The squealer tip may be formed from one or more materials such as oxide dispersion strengthened alloys and FeCrAl alloys. The squealer tip may be formed from a plurality of segmented tips extending radially outward and spaced apart from each other. For example, the squealer tip may be formed from two rails extending radially outward and spaced apart from each other. The two rails may be formed from outer and inner rails that each form a continuous ring. The squealer tip may be attached to the tip with a transient liquid phase bond or an additive manufacturing process, such as, a selective laser melting process.

1 . A turbine blade, comprising:
 a generally elongated airfoil having a leading edge, a trailing edge, a tip at a first end, a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the blade to a disc, and at least one cavity forming a cooling system in the blade; and   a squealer tip coupled to the tip at the first end, wherein the squealer tip is formed from a material selected from the group consisting of oxide dispersion strengthened alloys and FeCrAl alloys.   
     
     
         2 . The turbine blade of  claim 1 , wherein the oxide dispersion strengthened alloys comprise PM2000 and ODM 751. 
     
     
         3 . The turbine blade of  claim 1 , wherein the FeCrAl alloys comprise APMT. 
     
     
         4 . The turbine blade of  claim 1 , wherein the squealer tip is comprised of a plurality of segmented tips extending radially outward and spaced apart from each other. 
     
     
         5 . The turbine blade of  claim 1 , wherein the squealer tip is comprised of two rails extending radially outward and spaced apart from each other. 
     
     
         6 . The turbine blade of  claim 5 , wherein the two rails are formed from outer and inner rails that each form a continuous ring. 
     
     
         7 . The turbine blade of  claim 1 , wherein the squealer tip is attached to the tip with a transient liquid phase bond. 
     
     
         8 . The turbine blade of  claim 1 , wherein the squealer tip is attached to the tip with an additive manufacturing process. 
     
     
         9 . The turbine blade of  claim 8 , wherein the additive manufacturing process is a selective laser melting process. 
     
     
         10 . The turbine blade of  claim 8 , wherein the additive manufacturing process is a direct metal laser sintering. 
     
     
         11 . The turbine blade of  claim 1 , wherein the squealer tip is attached to the tip with a mechanical attachment system. 
     
     
         12 . The turbine blade of  claim 11 , wherein the mechanical attachment system is a dovetail attachment system. 
     
     
         13 . A turbine blade, comprising:
 a generally elongated blade having a leading edge, a trailing edge, a tip at a first end, a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the blade to a disc, and at least one cavity forming a cooling system in the blade; and   a squealer tip coupled to the tip at the first end, wherein the squealer tip is formed from two rails extending radially outward and spaced apart from each other.   
     
     
         14 . The turbine blade of  claim 13 , wherein the two rails are formed from outer and inner rails that each form a continuous ring. 
     
     
         15 . The turbine blade of  claim 13 , wherein the squealer tip is formed from a material selected from the group consisting of oxide dispersion strengthened alloys PM2000 and ODM 751 and FeCrAl alloys of APMT. 
     
     
         16 . The turbine blade of  claim 13 , wherein the squealer tip is attached to the tip with a transient liquid phase bond. 
     
     
         17 . The turbine blade of  claim 13 , wherein the squealer tip is attached to the tip with an additive manufacturing process selected from the group consisting of a selective laser melting process and a direct metal laser sintering. 
     
     
         18 . The turbine blade of  claim 13 , wherein the squealer tip is attached to the tip with a mechanical attachment system. 
     
     
         19 . A turbine blade, comprising:
 a generally elongated blade having a leading edge, a trailing edge, a tip at a first end, a root coupled to the blade at an end generally opposite the first end for supporting the blade and for coupling the blade to a disc, and at least one cavity forming a cooling system in the blade; and   a squealer tip coupled to the tip at the first end, wherein the squealer tip is formed from a material selected from the group consisting of oxide dispersion strengthened alloys and FeCrAl alloys;   wherein the squealer tip is attached to the tip with a transient liquid phase bond.   
     
     
         20 . The turbine blade of  claim 19 , wherein the oxide dispersion strengthened alloys comprise PM2000 and ODM 751, and the FeCrAl alloy comprises APMT. 
     
     
         21 . The turbine blade of  claim 19 , wherein the squealer tip is comprised of a plurality of segmented tips extending radially outward and spaced apart from each other.