US 12,292,116 B2
Carbon seal assembly
Pantcho P. Stoyanov, West Hartford, CT (US); Jonathan F. Zimmitti, Glastonbury, CT (US); and Nasr A. Shuaib, Watertown, MA (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Jun. 6, 2023, as Appl. No. 18/330,027.
Application 18/330,027 is a continuation of application No. 16/791,269, filed on Feb. 14, 2020, granted, now 11,746,907.
Prior Publication US 2023/0323951 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F16J 15/3284 (2016.01); F02C 7/28 (2006.01)
CPC F16J 15/3284 (2013.01) [F02C 7/28 (2013.01); F05D 2220/32 (2013.01); F05D 2240/55 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A seal assembly comprising:
a housing including a seal flange at least partially defining a seal opening; and
a carbon seal located at least partially in the seal opening and including a first axially facing surface;
the seal flange includes an axially facing surface having a carbide based coating and a diamond-like carbon coating in engagement with the first axially facing surface on the carbon seal;
the carbide based coating is formed on the seal flange;
wherein the diamond-like carbon coating covers the carbide based coating at a coating interface and the carbon seal and the diamond-like carbon coating are spaced from the seal flange by the carbide based coating;
wherein the carbide based coating includes at least one of a tungsten carbide-cobalt or a chromium carbide; and
wherein a recess is formed at a radially outer surface of the carbon seal and a spring is received within the recess to bias the carbon seal radially inwardly.