“Compositions And Methods Of Attachment Of Thick Environmental Barrier Coatings On Cmc Components”

Abstract: A coating system 20 on a CMC substrate 24 is provided, along with methods of its tape deposition onto a substrate 24. The coating system 20 can include a bond coat 26 on a surface of the CMC substrate 24; a first rare earth silicate coating 28a on the bond coat 26; a first sacrificial coating 30a of a first reinforced rare earth silicate matrix on the at least one rare earth silicate layer; a second rare earth silicate coating 28b on the sacrificial coating; a second sacrificial coating 30b of a second reinforced rare earth silicate matrix on the second rare earth silicate coating 28b; a third rare earth silicate coating 28c on the second sacrificial coating 30b; and an outer layer 32 on the third rare earth silicate coating 28c. The first sacrificial coating 30a and the second sacrificial coating 30b have, independently, a thickness of about 4 mils to about 40 mils. FIG. 2

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