US 11,702,950 B2
Seal coating
John R. Farris, Bolton, CT (US); and Michael G. McCaffrey, Windsor, CT (US)
Assigned to Raytheon Technologies Corporation, Farmington, CT (US)
Filed by United Technologies Corporation, Farmington, CT (US)
Filed on Apr. 18, 2019, as Appl. No. 16/388,219.
Application 16/388,219 is a division of application No. 14/883,289, filed on Oct. 14, 2015, abandoned.
Claims priority of provisional application 62/091,998, filed on Dec. 15, 2014.
Prior Publication US 2020/0025014 A1, Jan. 23, 2020
Int. Cl. F01D 11/12 (2006.01); B05D 3/00 (2006.01); F01D 25/00 (2006.01); C23C 4/01 (2016.01); C23C 28/04 (2006.01); C23C 4/18 (2006.01); C23C 4/11 (2016.01)
CPC F01D 11/12 (2013.01) [B05D 3/007 (2013.01); C23C 4/01 (2016.01); C23C 4/11 (2016.01); C23C 4/18 (2013.01); C23C 28/042 (2013.01); F01D 11/122 (2013.01); F01D 25/005 (2013.01); F05D 2240/11 (2013.01); F05D 2250/294 (2013.01); F05D 2300/20 (2013.01); Y02T 50/60 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of forming a coating comprising:
disposing a substrate having a plurality of protrusions on a seal;
depositing a topcoat in a soft, unconverted state over the plurality of protrusions, such that depositing the topcoat forms a gas path facing surface of the topcoat having a plurality of dimples formed between adjacent ones of the plurality of protrusions, each dimple of the plurality of dimples having a first depth;
creating a wear pattern of a channel in the topcoat during an initial rub event by accelerating an engine during a green run by running the engine up to a maximum power to cause a blade tip to rub the topcoat to a second depth that is less than the first depth; and
converting the topcoat during a high-temperature event;
wherein converting the topcoat comprises preserving the channel created during the initial rub event.