Protection of thermal barrier coating by an impermeable barrier coating
AssigneeGeneral Electric Company
InventorsBrian Thomas Hazel, Irene Spitsberg, Christine Govern, Bangalore A. Nagaraj
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Abstract
According to an embodiment of the invention, disclosed is a composite comprising a porous thermal barrier coating on a metallic part and an impermeable barrier coating adjacent to the outer surface of the thermal barrier coating. The impermeable barrier coating is dense and non-porous and comprises a rare earth silicate, the impermeable barrier coating thereby preventing infiltration of the contaminant composition into the thermal barrier coating.
Claims23
A composite comprising a porous thermal barrier coating comprising stabilized zirconia on a metallic part selected from the group consisting of a Ni based and a Co based superalloy, and an impermeable barrier coating adjacent to the outer surface of the thermal barrier coating and forming an outer layer of the composite, wherein the impermeable barrier coating is dense and non-porous and comprises a rare earth silicate selected from the group consisting of a silicate of lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium and mixtures thereof, the impermeable barrier coating thereby preventing infiltration of a contaminant composition into the thermal barrier coating.
A composite comprising a porous thermal barrier coating comprising stabilized zirconia on a metallic superalloy gas turbine engine part and an impermeable barrier coating adjacent to the outer surface of the thermal barrier coating and forming an outer layer of the composite, wherein the impermeable barrier coating is dense and non-porous and comprises a rare earth silicate selected from the group consisting of a silicate of lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium and mixtures thereof, the impermeable barrier coating thereby preventing infiltration of a contaminant composition into the thermal barrier coating, the composite comprising an inner layer of an alumina sacrificial coating under the impermeable barrier coating.
A composite comprising a porous thermal barrier coating comprising zirconia on a metallic superalloy part and an impermeable barrier coating adjacent to the outer surface of the thermal barrier coating and forming an outer layer of the composite, wherein the impermeable barrier coating is dense and non-porous and comprises a rare earth silicate selected from the group consisting of a silicate of lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium and mixtures thereof, the impermeable barrier coating thereby preventing infiltration of a contaminant composition into the thermal barrier coating, wherein the composite comprises an inner layer of a sacrificial coating of alumina under the impermeable barrier coating.
Dependencies are inferred from the claim text.