COMPOSITIONS AND METHODS OF DEPOSITION OF THICK ENVIRONMENTAL BARRIER COATINGS ON CMC BLADE TIIPS

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Coating systems (20) are provided for use on a CMC substrate (24), that can include : a bond coat (26) on a surface (25) of the CMC substrate (24); a first rare earth silicate coating (28a) on the bond coat; a sacrificial coating (30) of a 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; and an outer layer (32) on the second rare earth silicate coating. The first rare earth silicate coating comprises at least one rare earth silicate layer, and the second rare earth silicate coating comprises at least one rare earth silicate layer. The sacrificial coating has a thickness of about 4 mils to about 40 mils. Methods are also provided for tape deposition of a sacrificial coating on a CMC substrate.