US 12,366,170 B2
Flow body for a gas turbine, gas turbine, method for manufacturing a flow body for a gas turbine, and method for repairing a flow body of a gas turbine
Herbert Brandl, Baden (CH); Joerg Krueckels, Baden (CH); Ulrich Rathmann, Baden (CH); and Willy Hofmann, Baden (CH)
Assigned to Doosan Enerbility Co., Ltd., Changwon-si (KR)
Filed by DOOSAN ENERBILITY CO., LTD., Changwon-si (KR)
Filed on Jan. 10, 2024, as Appl. No. 18/408,739.
Claims priority of application No. 23173138 (EP), filed on May 12, 2023.
Prior Publication US 2024/0376826 A1, Nov. 14, 2024
Int. Cl. F01D 5/20 (2006.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); F01D 5/00 (2006.01); F01D 5/14 (2006.01); F01D 5/18 (2006.01)
CPC F01D 5/20 (2013.01) [B33Y 10/00 (2014.12); B33Y 80/00 (2014.12); F01D 5/005 (2013.01); F01D 5/187 (2013.01); F05D 2230/234 (2013.01); F05D 2230/31 (2013.01); F05D 2230/80 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A flow body for a gas turbine, comprising:
an airfoil extending along a radial direction between a platform end and a tip which has a tip surface, the airfoil being formed of a first metal material and comprising an inner cavity for receiving a gaseous cooling fluid; and
a squealer tip protruding from the tip surface of the tip and extending along a circumference of the tip so that the squealer tip at least partially surrounds the tip surface, wherein the squealer tip is formed from a second metal material and includes a plurality of internal cooling cavities that are separated from each other within the squealer tip, each of the internal cooling cavities being in fluid communication with the inner cavity via one or more fluid passages;
wherein the squealer tip is material bonded to a contact surface of the tip of the airfoil by an additively manufactured transition layer that connects the contact surface and a main portion of the squealer tip, the contact surface at least partially surrounding the tip surface of the tip, wherein the transition layer, compared to at least one of the main portion of the squealer tip and the airfoil, has at least one of (a) an increased ductility in combination with a reduced yield strength and (b) a reduced stiffness.