US 12,421,175 B2
Environmental barrier coatings
Glen Harold Kirby, Liberty Township, OH (US); Nathaniel Patrick Brown, Cincinnati, OH (US); Guruvenket Srinivasan, Loveland, OH (US); Reza Sarrafi-Nour, Clifton Park, NY (US); Nicholas Edward Antolino, Schenectady, NY (US); Julin Wan, Rexford, NY (US); Anant Achyut Setlur, Niskayuna, NY (US); and Taryn Elizabeth Hewitt, Cincinnati, OH (US)
Assigned to General Electric Company, Evendale, OH (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Jan. 26, 2022, as Appl. No. 17/584,496.
Prior Publication US 2023/0234895 A1, Jul. 27, 2023
Int. Cl. C04B 41/52 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); C04B 41/50 (2006.01)
CPC C04B 41/522 (2013.01) [C04B 41/0072 (2013.01); C04B 41/009 (2013.01); C04B 41/4529 (2013.01); C04B 41/5024 (2013.01); C04B 41/5096 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rare earth silicate-based coating system deposited via a thermal spray process, the coating system comprising:
a bondcoat layer comprising silicon and a sintering aid;
a rare earth silicate-based hermetic layer on the bondcoat layer, the rare earth silicate-based hermetic layer having an elastic modulus ranging from 100 GPa to 180 GPa; and
at least one rare earth silicate-based non-hermetic layer on the rare earth silicate-based hermetic layer, the at least one rare earth silicate-based non-hermetic layer having an elastic modulus ranging from 50 GPa to 100 GPa.