Protection of thermal barrier coating by an impermeable barrier coating

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According to an embodiment of the invention, disclosed is a composite comprising a porous thermal barrier coating (30) on a metallic part and an impermeable barrier coating (40) adjacent to the outer surface of the thermal barrier coating (30). The impermeable barrier coating (30) is dense and nonporous and comprises a rare earth silicate, the impermeable barrier coating (30) thereby preventing infiltration of the contaminant composition into the thermal barrier coating (30).