In-situ formation of multiphase air plasma sprayed barrier coatings for turbine components
AssigneeSiemens Westinghouse Power Corporation
InventorRamesh Subramanian
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Abstract
A turbine component (10), such as a turbine blade, is provided which is made of a metal alloy (22) and a base, planar-grained thermal barrier layer (28) applied by air plasma spraying on the alloy surface, where a heat resistant ceramic oxide overlay material (32′) covers the bottom thermal barrier coating (28), and the overlay material is the reaction product of the precursor ceramic oxide overlay material (32) and the base thermal barrier coating material (28).
Claims9
A turbine component comprising a metal alloy substrate and a flat thermal barrier coating on and parallel to the substrate surface, the thermal barrier coating having (a) a planar-grained ceramic oxide base material with open porosity and microcracks generally parallel to the surface of the substrate and (b) a heat resistant ceramic oxide overlay covering the top surface of the planar-grained base material and infiltrating the open porosity and microcracks of the base material, where the ceramic oxide overlay comprises the reaction product of a ceramic oxide precursor material and the ceramic oxide base material.
Dependencies are inferred from the claim text.