Environmental barrier coating

Patent metadata

Field	Value
Publication number	US-12312281-B2
Application number	US-202217711625-A
Country	US
Kind code	B2
Filing date	Apr 1, 2022
Priority date	Apr 1, 2022
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A coating according to an exemplary embodiment of this disclosure, among other possible things includes a bond coat including gettering particles and diffusive particles dispersed in a matrix; a top coat disposed over the bond coat, the top coat includes metal silicate particles; and an intermediate layer between the bond coat and the top coat. The intermediate layer includes hafnium silicate particles and matrix. A concentration of metal silicate in the intermediate layer is less than a concentration of metal silicate in the top coat. An article is also disclosed.

First claim

What is claimed is:

1. A coating, comprising:
a bond coat including gettering particles and diffusive particles dispersed in a matrix;
a top coat disposed over the bond coat, the top coat include metal silicate particles; and
an intermediate layer between the bond coat and the top coat, the intermediate layer including hafnium silicate particles and matrix, wherein a concentration of the hafnium silicate particles in the intermediate layer is less than a concentration of the metal silicate particles in the top coat.

2. The coating as recited in claim 1 , wherein a concentration of matrix in the bond coat is greater than a concentration of matrix in the intermediate layer.

3. The coating as recited in claim 1 , wherein a concentration of matrix in the intermediate layer is greater than a concentration of matrix in the top coat.

4. The coating as recited in claim 3 , wherein a concentration of matrix in the top coat is less than about 10% by volume.

5. The coating as recited in claim 3 , wherein a concentration of the metal silicate particles in the top coat is greater than about 90% by volume.

6. The coating as recited in claim 1 , wherein a concentration of the metal silicate particles in the top coat is greater than about 90% by volume.

7. The coating as recited in claim 1 , wherein the bond coat has a concentration of metal silicate that is less than about 10% by volume.

8. The coating as recited in claim 1 , wherein a concentration of metal silicate in the bond coat is less than a concentration of metal silicate in the intermediate layer.

9. The coating as recited in claim 1 , further comprising a hafnium dioxide overlayer disposed over the top coat.

10. The coating as recited in claim 1 , further comprising an inner bond coat, the inner bond coat including gettering particles dispersed in matrix.

11. The coating as recited in claim 10 , wherein the inner bond coat has a concentration of matrix that is greater than a concentration of matrix in the bond coat.

12. The coating as recited in claim 10 , wherein the inner bond coat has a concentration of metal silicate that is less than about 10% by volume.

13. The coating as recited in claim 10 , wherein the inner bond coat is about half as thick as the bond coat.

14. The coating as recited in claim 1 , wherein the metal silicate particles in the top coat are hafnium silicate.

15. An article, comprising:
a ceramic matrix composite substrate; and
a coating disposed over the ceramic matrix composite substrate, the coating including
a bond coat including gettering particles and diffusive particles dispersed in a matrix;
a top coat disposed over the bond coat, the top coat include metal silicate particles and
an intermediate layer between the bond coat and the top coat, the intermediate layer including hafnium silicate particles and matrix, wherein a concentration of the hafnium silicate particles in the intermediate layer is less than a concentration of the metal silicate particles in the top coat.

16. The article of claim 15 , further comprising a first diffusion zone between the bond coat and the intermediate layer, the first diffusion zone having a concentration of hafnium silicate particles that is between a concentration of metal silicate in the bond coat and a concentration of metal silicate in the intermediate layer, and a second diffusion zone between the intermediate layer and the top coat, the second diffusion zone having a concentration of metal silicate that is between the concentration of metal silicate in the intermediate layer and a concentration of metal silicate in the top coat.

17. The article of claim 15 , wherein a concentration of metal silicate in the bond coat is less than about 10% by volume.

18. The article of claim 15 , wherein a concentration of matrix in the top coat is less than about 10% by volume.

19. The article of claim 15 , further comprising an inner bond coat, the inner bond coat including gettering particles dispersed in matrix.

20. The article of claim 15 , further comprising a comprising a hafnium dioxide overlayer disposed over the top coat.

Assignees

• Raytheon Tech Corp
• Rtx Corp

Inventors

• Jackson Iii Richard Wesley
• Tang Xia
• Beals James T

Classifications

• C04B41/89

  for obtaining at least two superposed coatings having different compositions · CPC title

• C04B41/87

  Ceramics · CPC title

• C04B41/522

  Multiple coatings, for one of the coatings of which at least one alternative is described · CPC title

• C04B41/5042

  Zirconium oxides or zirconates; Hafnium oxides or hafnates · CPC title

• C04B41/5024

  Silicates (C04B41/5022 takes precedence; silico-fluorides C04B41/5018) · CPC title