Multi-component high stability environmental barrier coatings
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsDongming Zhu, Bryan J. Harder, Janet B. Hurst
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Abstract
An advanced high temperature environmental barrier coating system is disclosed for protecting Si-based ceramics and SiC/SiC ceramic matrix composites (CMCs). This innovation provides a series of environmental barrier coating composition systems to achieve exceptional temperature capability, erosion and calcium-magnesium-aluminosilicate (CMAS) resistance and durability of the environmental barrier coated ceramic turbine engine hot-section components, in harsh turbine engine environments. The environmental barrier coating systems have been demonstrated for 1650° C. temperature capability and help prime-reliant designs.
Claims15
An environmental barrier coating system comprising
- a multicomponent rare earth apatite composition comprising a rare earth apatite silicate comprising RE2O3-10 mol%SiO2 to RE2O3-75 mol%SiO2;
- and
- a multicomponent (Hf,RE)2Si2−xO7−2x top coat and alternating layers of a multicomponent (Hf,RE)2Si2−xO7−2x and the multicomponent rare earth apatite composition.
An environmental barrier coating system comprising:
- a multicomponent (Hf,RE)2Si2−xO7−2x top coat;
- a second EBC layer comprising a multicomponent rare earth apatite composition comprising a rare earth apatite silicate comprising RE2O3-10 mol%SiO2 to RE2O3-75 mol%SiO2;
- and
- a bond coat layer adjacent to a ceramic substrate.
Dependencies are inferred from the claim text.