US 11,053,578 B2
Removing coatings from ceramic matrix composite substrates
David C. Fairbourn, Sandy, UT (US); Sunny Chang, Carmel, IN (US); and Johnny D. Grubbs, Clayton, IN (US)
Assigned to Rolls-Royce Corporation, Indianapolis, IN (US)
Filed by Rolls-Royce Corporation, Indianapolis, IN (US)
Filed on Oct. 17, 2017, as Appl. No. 15/786,057.
Claims priority of provisional application 62/411,392, filed on Oct. 21, 2016.
Prior Publication US 2018/0112301 A1, Apr. 26, 2018
Int. Cl. C23G 1/08 (2006.01); C23G 1/10 (2006.01); C23C 4/02 (2006.01); F01D 5/28 (2006.01); C04B 41/00 (2006.01); C04B 41/53 (2006.01); C04B 41/91 (2006.01); F01D 5/00 (2006.01)
CPC C23C 4/02 (2013.01) [C04B 41/009 (2013.01); C04B 41/5353 (2013.01); C04B 41/91 (2013.01); C23G 1/08 (2013.01); C23G 1/10 (2013.01); F01D 5/005 (2013.01); F01D 5/288 (2013.01); F05D 2300/6033 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method comprising:
removing a portion of a coating using an abrasive material or a liquid jet, wherein the coating comprises a rare earth silicate, and wherein the coating is on a substrate comprising a ceramic or ceramic matrix composite;
after removing the portion of the coating using the abrasive material or the liquid jet, contacting the coating with a liquid comprising an active species, wherein the active species comprises a mineral acid, and wherein the mineral acid comprises at least one of hydrochloric acid (HCl), nitric acid (HNO3), phosphoric acid (H3PO4), hydrobromic acid (HBr), hydroiodic acid (HI), sulfuric acid (H2SO4), or sulfamic acid (H3NSO3); and
working the coating to cause removal of at least a portion of the coating.