Environmental barrier coatings
AssigneeRtx Corporation
InventorsRichard Wesley JACKSON, III, Tianli ZHU, Xia TANG, James BEALS
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Abstract
Environmental barrier coatings (EBCs) are disclosed having one or more sealing layers incorporated therein to inhibit ingress of corrosive materials into EBCs and their associated ceramic materials (CMCs). The sealing layers are yttrium oxide (Y2O3), lanthanum oxide (La2O3), ytterbium oxide (Yb2O3), hafnium oxide (HfO2), zirconium oxide (ZrO2), hafnium silicon oxide (HfSiO4), zirconium silicon oxide (ZrSiO4), ytterbium silicon oxide (Yb2Si2O7), and/or aluminum oxide (Al2O3) layers, and are applied by atomic layer deposition.
Claims20
A method for preparing an environmental barrier coating (EBC) coating, said method comprising:
- a) applying a bond coat comprising one or more layers to a ceramic matrix composite (CMC) substrate to provide a coated CMC substrate;
- and
- b) applying a top coat comprising one or more layers to the coated CMC substrate;
- wherein at least one sealing layer is applied (i) between the bond coat and the CMC substrate, (ii) between the bond coat and the top coat, (iii) between layers of the bond coat, (iv) between layers of the top coat, and/or (v) on an upper surface of the top coat;
- and
- wherein the at least one sealing layer is a yttrium oxide (Y2O3), a lanthanum oxide (La2O3), a ytterbium oxide (Yb2O3), a hafnium oxide (HfO2), a zirconium oxide (ZrO2), a hafnium silicon oxide (HfSiO4), a zirconium silicon oxide (ZrSiO4), a ytterbium silicon oxide (Yb2Si2O7), and/or an aluminum oxide (Al2O3) layer, and the at least one sealing layer is applied by atomic layer deposition.
A method for sealing pores of a ceramic matrix composite and/or an environmental barrier coating (EBC) comprising:
- applying by atomic layer deposition at least one sealing layer to a surface of the ceramic matrix composite (CMC) substrate or to a surface of a layer of the environmental barrier coating (EBC),
- wherein the at least one sealing layer is a yttrium oxide (Y2O3), a lanthanum oxide (La2O3), a ytterbium oxide (Yb2O3), a hafnium oxide (HfO2), a zirconium oxide (ZrO2), a hafnium silicon oxide (HfSiO4), a zirconium silicon oxide (ZrSiO4), a ytterbium silicon oxide (Yb2Si2O7), and/or an aluminum oxide (Al2O3) layer.
A composite structure comprising:
- a) a ceramic matrix composite (CMC) substrate;
- b) a bond coat comprising one or more layers above the CMC substrate;
- c) a top coat above the bond coat wherein the top coat comprises one or more layers;
- and
- d) at least one sealing layer wherein the sealing layer is applied (i) between the bond coat and the CMC substrate, (ii) between the bond coat and the top coat, (iii) between layers of the bond coat, (iv) between layers of the top coat, and/or (v) on top of the top coat;
- wherein the at least one sealing layer is a yttrium oxide (Y2O3), a lanthanum oxide (La2O3), a ytterbium oxide (Yb2O3), a hafnium oxide (HfO2), a zirconium oxide (ZrO2), a hafnium silicon oxide (HfSiO4), a zirconium silicon oxide (ZrSiO4), a ytterbium silicon oxide (Yb2Si2O7), and/or an aluminum oxide (Al2O3) layer, and the at least one sealing layer is applied by atomic layer deposition.
Dependencies are inferred from the claim text.