US 11,719,114 B2
Low friction carbon—carbon seal assembly
Pantcho P. Stoyanov, West Hartford, CT (US)
Assigned to RAYTHEON TECHNOLOGIES CORPORATION, Farmington, CT (US)
Filed by United Technologies Corporation, Farmington, CT (US)
Filed on Sep. 18, 2019, as Appl. No. 16/574,586.
Claims priority of provisional application 62/733,598, filed on Sep. 19, 2018.
Prior Publication US 2021/0062665 A1, Mar. 4, 2021
Int. Cl. F16J 15/16 (2006.01); F01D 11/00 (2006.01); F16J 15/3284 (2016.01)
CPC F01D 11/003 (2013.01) [F16J 15/3284 (2013.01); F05D 2240/55 (2013.01); F05D 2300/224 (2013.01); F05D 2300/50 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A seal assembly for a gas turbine engine, comprising:
a seal comprising a carbon material; and
a seal seat positioned for rotation relative to the seal, wherein the seal and the seal seat are mounted between a rotational shaft and stationary structure of the gas turbine engine, and each of the seal and the seal seat have a sealing surface which together define a sliding seal, and wherein at least the sealing surface of the seal seat is made of the same carbon material as the sealing surface of the seal, wherein the seal seat has a recessed area, and a carbon-based block mounted in the recess, the carbon-based block defining the sealing surface of the seal seat, and wherein the sealing surfaces of the seal and the seal seat are the same material selected from the group consisting of electrographitic grade carbon, carbon-graphite grade carbon, and combinations thereof.