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US 2026/0200810 A1Published application
Environmental barrier coatings
AssigneeRtx Corporation
InventorsDavid A. LITTON, Nadia ROHBECK
Life of this patent
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Abstract
Environmental barrier coatings (EBCs) are disclosed having a topcoat layer having a primary hafnon phase and a dispersed hafnia phase. The hafnia can be homogeneously dispersed or the layer can exhibit a concentration gradient in which the hafnia concentration increases continuously or stepwise. The hafnon primary phase provides a desirable CTE match with the underlying CMC substrate, while the dispersed hafnia provides desirable corrosion resistance.
Claims20
A coated substrate composite comprising:
- a ceramic matrix composite substrate comprising ceramic fiber tows within a ceramic matrix;
- an environmental barrier coating (EBC) system applied to the substrate wherein the coating system comprises a layer having a primary hafnon phase and a dispersed hafnia phase.
A method of preparing a coated substrate comprising:
- providing ceramic matrix composite substrate comprising ceramic fiber tows within a ceramic matrix;
- applying an environmental barrier coating (EBC) system to the substrate, wherein the coating system comprises a layer having a primary hafnon phase and a dispersed hafnia phase;
- and
- the layer is applied by:
- (a) thermal spraying a powder composition containing hafnium silicate or a powder composition containing a mixture of hafnium oxide powder and silica powder;
- or (b) slurry coating wherein the slurry contains hafnium silicate particles and hafnia particles.
3 more elements
A jet engine component comprising:
- a ceramic matrix composite substrate comprising ceramic fiber tows within a ceramic matrix;
- an environmental barrier coating (EBC) system applied to the substrate wherein the coating system comprises a layer having a primary hafnon phase and a dispersed hafnia phase.
- wherein said component is a turbine blade, turbine vane, blade outer air seal, or combustor liner.
Dependencies are inferred from the claim text.