US 12,071,382 B2
Post deposition heat treatment procedures for EBC and abradable coating on ceramic or CMC substrate
Jun Shi, Carmel, IN (US); Li Li, Carmel, IN (US); and Gregory John Kenneth Harrington, Indianapolis, IN (US)
Assigned to Rolls-Royce Corporation, Indianapolis, IN (US)
Filed by Rolls-Royce Corporation, Indianapolis, IN (US)
Filed on Dec. 24, 2019, as Appl. No. 16/726,553.
Prior Publication US 2021/0276925 A1, Sep. 9, 2021
Int. Cl. C04B 41/00 (2006.01); C04B 41/50 (2006.01); C04B 41/89 (2006.01); C23C 4/18 (2006.01); F01D 5/28 (2006.01)
CPC C04B 41/009 (2013.01) [C04B 41/0072 (2013.01); C04B 41/5024 (2013.01); C04B 41/89 (2013.01); C23C 4/18 (2013.01); F01D 5/282 (2013.01); F01D 5/288 (2013.01); F05D 2230/31 (2013.01); F05D 2230/40 (2013.01); F05D 2230/90 (2013.01); F05D 2300/15 (2013.01); F05D 2300/6033 (2013.01); F05D 2300/611 (2013.01)] 19 Claims
 
1. A method comprising:
depositing an environmental barrier coating (EBC) on a ceramic or ceramic matrix composite (CMC) substrate to form an as-deposited EBC;
heat treating the as-deposited EBC following the deposition of the as-deposited EBC on the substrate to form a heat treated EBC having a first porosity;
subsequently depositing an abradable coating on the heat treated EBC to form an as-deposited abradable coating; and
subsequently heat treating the as-deposited abradable coating to form a heat treated abradable coating having a second porosity that is greater than the first porosity of the heat treated EBC,
wherein heat treating the as-deposited EBC includes heating the as-deposited EBC at a first controlled rate,
wherein heat treating the as-deposited abradable coating includes heating the as-deposited abradable coating at a second controlled rate that is less than the first controlled rate, and
wherein heating the as-deposited abradable coating at the second controlled rate maintains a porosity of the heat treated abradable coating as compared to the as-deposited abradable coating.