US 11,746,907 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 United Technologies Corporation, Farmington, CT (US)
Filed on Feb. 14, 2020, as Appl. No. 16/791,269.
Prior Publication US 2021/0254719 A1, Aug. 19, 2021
Int. Cl. F16J 15/32 (2016.01); 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)] 1 Claim
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 and the carbon seal is fixed from rotation relative to the housing;
wherein 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;
wherein the carbon seal includes a first axial dimension and a sealing surface in engagement with a rotatable shaft includes a second axial dimension that is less than the first axial dimension, wherein the sealing surface is a radially innermost surface of the carbon seal;
wherein the carbide based coating is in direct contact with the seal flange; and
wherein the diamond-like carbon coating is in direct contact with the carbide based coating at a coating interface and the carbon seal and the diamond-like carbon coating is spaced from the seal flange by the carbide based coating.