Environmental barrier coating and method of forming the same

Patent metadata

Field	Value
Publication number	US-12227463-B2
Application number	US-202117314448-A
Country	US
Kind code	B2
Filing date	May 7, 2021
Priority date	May 7, 2021
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A method of applying a coating to a substrate includes forming a slurry by mixing elemental precursors of gettering particles, diffusive particles, matrix material, and a carrier fluid; applying the slurry to a substrate; and sintering the slurry to form a composite material. The sintering causes the elemental precursors to react with one another to form gettering particles. An article is also disclosed.

First claim

What is claimed is:

1. A method of applying a coating to a substrate, comprising:
forming a slurry by mixing elemental precursors of gettering particles, diffusive particles, matrix material, and a carrier fluid;
applying the slurry to a substrate; and
sintering the slurry to form a composite material, whereby the sintering causes the elemental precursors to react with one another to form gettering particles.

2. The method of claim 1 , wherein the elemental precursors include silicon and the gettering particles are intermetallic silicides.

3. The method of claim 2 , wherein the elemental precursors include silicon and a refractory metal.

4. The method of claim 1 , further comprising the step of applying a topcoat.

5. The method of claim 4 , wherein the step of applying the topcoat is performed before the step of sintering the slurry.

6. The method of claim 1 , wherein the sintering is performed at a temperature between about 1000° C. and 1400° C. in an inert atmosphere.

7. The method of claim 1 , further comprising the step of subjecting the slurry to a low-heat treatment prior to the sintering step, and wherein sintering step is performed at a first temperature, and the low-heat treatment is performed at a second temperature lower than the first temperature.

8. The method of claim 1 , wherein after the mixing step, the elemental precursors are embedded in one another.

9. The method of claim 1 , wherein after the applying step, the elemental precursors are in an interconnected matrix.

10. The method of claim 1 , wherein after the sintering step, the gettering particles have a platelet shape.

11. The method of claim 10 , where the gettering particles have a major axis that is generally parallel to a surface of the substrate.

12. The method of claim 11 , wherein after the sintering step, the gettering particles are arranged in an interconnected matrix.

13. The method of claim 1 , wherein the slurry is aqueous.

14. The method of claim 1 , wherein the substrate is a ceramic matrix composite material.

Assignees

• Raytheon Tech Corp
• Rtx Corp

Inventors

• Beals James T
• Jackson Richard Wesley
• Tang Xia

Classifications

• C04B2235/5292

  Flakes, platelets or plates · CPC title

• C04B2235/428

  Silicon · CPC title

• C04B2235/3891

  Silicides, e.g. molybdenum disilicide, iron silicide · CPC title

• C04B41/52

  Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation} · CPC title

• C04B41/5071

  Silicides · CPC title