Compositions and methods of attachment of thick environmental barrier coatings on CMC components
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United States of America Patent
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Aug 27, 2019
Grant Date -
Jan 19, 2017
app pub date -
Jul 13, 2015
filing date -
Jul 13, 2015
priority date (Note) -
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Abstract
A coating system on a CMC substrate is provided, along with methods of its tape deposition onto a substrate. The coating system can include a bond coat on a surface of the CMC substrate; a first rare earth silicate coating on the bond coat; a first sacrificial coating of a first reinforced rare earth silicate matrix on the at least one rare earth silicate layer; a second rare earth silicate coating on the sacrificial coating; a second sacrificial coating of a second reinforced rare earth silicate matrix on the second rare earth silicate coating; a third rare earth silicate coating on the second sacrificial coating; and an outer layer on the third rare earth silicate coating. The first sacrificial coating and the second sacrificial coating have, independently, a thickness of about 4 mils to about 40 mils.
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