US 12,392,252 B2
Hybrid bonded configuration for blade outer air seal (BOAS)
Paul M. Lutjen, Kennebunkport, ME (US); John R. Farris, Lebanon, CT (US); Brian T. Hazel, Avon, CT (US); Matthew A. Devore, Rocky Hill, CT (US); John A. Sharon, West Hartford, CT (US); James F. Wiedenhoefer, Windsor, CT (US); and Mario P. Bochiechio, Vernon, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Jun. 17, 2022, as Appl. No. 17/842,924.
Claims priority of provisional application 63/212,325, filed on Jun. 18, 2021.
Claims priority of provisional application 63/232,972, filed on Aug. 13, 2021.
Prior Publication US 2023/0151738 A1, May 18, 2023
Int. Cl. B23P 17/00 (2006.01); F01D 11/08 (2006.01); F01D 25/00 (2006.01)
CPC F01D 11/08 (2013.01) [F01D 25/007 (2013.01); F05D 2230/10 (2013.01); F05D 2230/21 (2013.01); F05D 2230/22 (2013.01); F05D 2260/204 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of assembling a blade outer air seal (BOAS) of a gas turbine engine to form a curved outer air passage with a distal tip of a turbine blade, the method comprising:
forming a first section as a curved outer section of the BOAS;
defining, in the first section, passages with a depth greater than 0.005 inches (0.127 mm);
forming a second section as a curved inner section of the BOAS;
metallurgically bonding the first and second sections whereby the passages are delimited by the first and second sections; and
executing the metallurgically bonding without modifying shapes and sizes of the passages,
wherein the metallurgically bonding comprises field assisted sintering technology (FAST) and FAST utilizes a high amperage pulsed direct current (DC) electrical current to heat the first and second sections for bonding through Joule heating while under uniaxial compression that accommodates respective curvatures of the first and second sections,
wherein:
the method further comprises defining, in the second section, additional passages that mirror the passages of the first section,
the metallurgically bonding of the first and second sections comprises metallurgically bonding the first and second sections by FAST along a line centered between the passages of the first section and the additional passages, and
the passages are fluidly coupled to a cooling circuit.