Low thermal conductivity thermal barrier coating system and method therefor
AssigneeGeneral Electric Company
InventorsIrene Spitsberg, Bangalore Aswatha Nagaraj
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Abstract
A multilayer thermal barrier coating (TBC) having a low thermal conductivity that is maintained or even decreases as a result of a post-deposition high temperature exposure. The TBC comprises an inner layer and an insulating layer overlying the inner layer. The inner layer is preferably yttria-stabilized zirconia (YSZ), while the insulating layer contains barium strontium aluminosilicate (BSAS). After deposition, the TBC is heated to a temperature and for a duration sufficient to cause a decrease in the thermal conductivity of the BSAS-containing layer and, consequently, the entire TBC.
Claims14
A multilayer thermal barrier coating on a metal surface of a component, the thermal barrier coating comprising an inner layer containing yttria-stabilized zirconia on the surface of the component and an insulating layer containing barium strontium aluminosilicate overlying the inner layer, the thermal conductivity of the barium strontium aluminosilicate within the insulating layer being less than 1.5 W/mK.
A thermal barrier coating system on a surface of a gas turbine engine component, the thermal barrier coating system comprising a metallic bond coat and a multilayer thermal baffler coating, the thermal barrier coating comprising an inner layer consisting of yttria-stabilized zirconia on the bond coat and an insulating layer containing barium strontium aluminosilicate overlying the inner layer, the thermal conductivity of the barium strontium aluminosilicate within the insulating layer being less than 1.5 W/mK.
Dependencies are inferred from the claim text.