ARTICLES FOR HIGH TEMPERATURE SERVICE AND METHOD FOR MAKING

摘要

Articles, such as components for high temperature turbomachinery components, include one or more coatings bearing certain perovskite compositions resistant to incursion by liquid calcium-magnesium-aluminum-silicon-oxide (CMAS) materials during service. The CMAS-reactive material includes a perovskite-structured oxide, which comprises a) a rare earth element, b) niobium, tantalum or a combination of tantalum and niobium, and c) oxygen. The CMAS-reactive material is present in an effective amount to react with a CMAS composition at an operating temperature, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition.

主权项

1. An article comprising:
a substrate; and a plurality of coatings disposed on the substrate, the plurality of coatings comprising a thermal barrier coating disposed over the substrate; and a protective coating comprising a calcium-magnesium-aluminum-silicon-oxide (CMAS)-reactive material disposed over the thermal barrier coating, the CMAS-reactive material comprising a perovskite-structured oxide, the oxide comprising a) a rare earth element, b) niobium, tantalum or a combination of tantalum and niobium, and c) oxygen; wherein the CMAS-reactive material is present in the plurality of coatings in an effective amount to react with a CMAS composition at an operating temperature of the thermal barrier coating, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition.