Coating for improved surface finish

Patent metadata

Field	Value
Publication number	US-11034842-B2
Application number	US-201816220804-A
Country	US
Kind code	B2
Filing date	Dec 14, 2018
Priority date	Dec 14, 2018
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A coating includes: at least 34.9 percent by mass silicon dioxide; at least 9.1 percent by mass aluminum oxide; and at least 16.1 percent by mass yttrium oxide.

First claim

What is claimed is:

1. A material composition, comprising:
at least 34.9 percent by mass silicon dioxide;
at least 9.1 percent by mass aluminum oxide;
at least 16.1 percent by mass yttrium oxide; and
a B-A-S material composition comprising barium oxide, aluminum oxide, and silicon dioxide.

2. The material composition of claim 1 , further comprising:
at least 3 percent by mass boron oxide.

3. The material composition of claim 2 , further comprising:
at least 5 percent by mass boron oxide.

4. The material composition of claim 3 , further comprising:
at least 41.7 percent by mass silicon dioxide;
at least 11.1 percent by mass aluminum oxide; and
at least 19.6 percent by mass yttrium oxide.

5. The material composition of claim 1 , wherein the B-A-S material composition comprises:
from about 15 percent to about 25 percent by mass barium oxide;
from about 8 percent to about 18 percent by mass aluminum oxide; and
from about 62 percent to about 72 percent by mass silicon dioxide.

6. The material composition of claim 1 , wherein the B-A-S material composition comprises at least about 10% of a total composition of the material composition.

7. The material composition of claim 1 , wherein the B-A-S material composition comprises between about 10% and about 30% of the total composition of the material composition.

8. The material composition of claim 1 , further comprising:
from about 49 percent to about 59 percent by mass silicon dioxide;
from about 13 percent to about 23 percent by mass aluminum oxide; and
from about 23 percent to about 33 percent by mass yttrium oxide.

9. The material composition of claim 1 , further comprising:
from about 51 percent to about 57 percent by mass silicon dioxide;
from about 15 percent to about 21 percent by mass aluminum oxide; and
from about 25 percent to about 31 percent by mass yttrium oxide.

10. The material composition of claim 1 , further comprising:
from about 52 percent to about 56 percent by mass silicon dioxide;
from about 16 percent to about 20 percent by mass aluminum oxide; and
from about 26 percent to about 30 percent by mass yttrium oxide.

11. The material composition of claim 1 , further comprising a coating of the material composition.

12. The material composition of claim 11 , further comprising a ceramic matrix composites (CMC) substrate, wherein the coating is disposed over the CMC substrate.

13. The material composition of claim 12 , wherein the CMC substrate is porous, and the coating is non-porous.

14. The material composition of claim 1 , further comprising a component of a gas turbine engine having the material composition.

15. The material composition of claim 1 , wherein the material composition comprises a smooth surface having a roughness of less than about 150 Ra.

16. The material composition of claim 1 , wherein the material composition comprises a smooth surface having a roughness of between about 10 Ra and about 80 Ra.

17. A coating, comprising:
at least 34.9 percent by mass silicon dioxide;
at least 9.1 percent by mass aluminum oxide; and
at least 16.1 percent by mass yttrium oxide, wherein the coating comprises a smooth surface having a roughness of less than about 150 Ra.

18. The coating of claim 17 , wherein the coating comprises a coefficient of thermal expansion (CTE) equal to or less than about 8.0 (×10{circumflex over ( )}−6/(° C.)), wherein the coating comprises a softening point of greater than 1200° C., and the coating is non-porous.

19. The coating of claim 17 , wherein the coating is disposed over a ceramic matrix composites (CMC) substrate.

20. The coating of claim 17 , wherein the coating further comprises a B-A-S material composition, wherein the B-A-S material composition comprises barium oxide, aluminum oxide, and silicon dioxide.

21. A system, comprising:
a component of a gas turbine engine, wherein the component comprises a ceramic matrix composites (CMC) substrate; and
a coating disposed over the CMC substrate, wherein the coating has a material composition, comprising:
at least 34.9 percent by mass silicon dioxide;
at least 9.1 percent by mass aluminum oxide; and
at least 16.1 percent by mass yttrium oxide, wherein the coating comprises a smooth surface having a roughness of less than about 150 Ra, and the coating defines a flow-path boundary and/or an interfacing surface in the gas turbine engine.

22. The system of claim 21 , wherein the material composition of the coating further comprises a B-A-S material composition, wherein the B-A-S material composition comprises barium oxide, aluminum oxide, and silicon dioxide.

Assignees

• Gen Electric

Inventors

• Hafner Matthew Troy
• Delvaux John Mcconnell
• Parolini Jason Robert
• Bordia Rajendra Kumar
• Li Quan

Classifications

• F01D5/288 Primary

  Protective coatings for blades · CPC title

• C04B41/5035

  Silica · CPC title

• C08K2003/2227

  of aluminium · CPC title

• C04B41/5059

  Silicon carbide · CPC title

• C09D7/61

  inorganic · CPC title