Silicon oxycarbide-based environmental barrier coating

Patent metadata

Field	Value
Publication number	US-12091756-B2
Application number	US-202117403296-A
Country	US
Kind code	B2
Filing date	Aug 16, 2021
Priority date	Jan 14, 2014
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An article includes a silicon oxycarbide-based layer that has Si, O, and C in a covalently bonded network. The silicon oxycarbide-based layer has first and second opposed surfaces. A calcium-magnesium alumino-silicate-based layer is interfaced with the first surface of the silicon oxycarbide-based layer.

First claim

What is claimed is:

1. An article comprising:
a silicon oxycarbide-based layer having Si, O, and C in a covalently bonded network, the silicon oxycarbide-based layer having first and second opposed surfaces and being composed of a continuous matrix phase of either SiO 2 or barium-magnesium alumino-silicate, dispersed regions of silicon oxycarbide within the continuous matrix phase, and dispersed regions of the other of the SiO 2 or that barium-magnesium alumino-silicate within the continuous matrix phase, wherein the silicon oxycarbide-based layer has a composition SiO x M z C y , where M is at least one metal selected from the group of aluminum, boron, transition metals, refractory metals, rare earth metals, and alkaline earth metals, x<2, y>0 and z<1 and x and z are non-zero; and
a calcium-magnesium alumino-silicate-based layer interfaced with the first surface of the silicon oxycarbide-based layer, wherein the calcium-magnesium alumino-silicate-based layer partially penetrates into pores of the silicon oxycarbide-based layer in a liquid state such that at least a central core of the silicon oxycarbide-based layer is free of calcium-magnesium alumino-silicate-based material, wherein the silicon oxycarbide-based layer is thicker than the calcium-magnesium alumino-silicate-based layer.

2. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer includes, by volume, 5-65% of the SiO 2 .

3. The article as recited in claim 1 , wherein the SiO 2 is a continuous matrix phase with regions of the silicon oxycarbide dispersed there through.

4. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer further includes a dispersed phase of barium-magnesium alumino-silicate.

5. The article as recited in claim 4 , wherein the silicon oxycarbide-based layer includes, by volume, 1-30% of the dispersed phase of barium-magnesium alumino-silicate.

6. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer a continuous matrix phase of SiO 2 and a dispersed phase of barium-magnesium alumino-silicate.

7. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer includes a continuous matrix phase of barium-magnesium alumino-silicate and a dispersed phase of SiO 2 .

8. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer includes, by volume, 5-65% of the continuous matrix phase, and 1-30% of a dispersed phase of the other of the SiO 2 or barium-magnesium alumino-silicate, with a remainder of silicon oxycarbide.

9. The article as recited in claim 1 , wherein the calcium-magnesium alumino-silicate-based layer has an average thickness of 1 micrometer to 3 millimeters.

10. The article as recited in claim 1 , wherein the silicon oxycarbide-based layer includes discrete regions of silicon oxycarbide-based material, the discrete regions having an average maximum dimension of 1-75 micrometers.

11. The article as recited in claim 1 , the calcium-magnesium alumino-silicate-based layer sealing the silicon oxycarbide-based layer from oxygen diffusion and steam recession into the silicon oxycarbide-based layer.

12. The article as recited in claim 1 , wherein the metal is a refractory metal.

13. The article as recited in claim 1 , wherein the metal is a rare earth metal.

14. The article as recited in claim 1 , wherein the metal is a transition metal.

15. The article as recited in claim 1 , wherein the metal is an alkaline earth metal.

16. A composite comprising:
a silicon oxycarbide-based material having Si, O, and C in a covalently bonded network, the silicon oxycarbide-based material having a surface and being composed of a continuous matrix phase of either SiO 2 or barium-magnesium alumino-silicate, dispersed regions of silicon oxycarbide within the continuous matrix phase, and dispersed regions of the other of the SiO 2 or that barium-magnesium alumino-silicate within the continuous matrix phase, wherein the silicon oxycarbide-based layer has a composition SiO x M z C y , where M is at least one metal selected from the group of aluminum, boron, transition metals, refractory metals, rare earth metals, and alkaline earth metals, x<2, y>0 and z<1 and x and z are non-zero; and
a calcium-magnesium alumino-silicate-based material interfaced with the surface of the silicon oxycarbide-based material, wherein the calcium-magnesium alumino-silicate-based layer partially penetrates into pores of the silicon oxycarbide-based layer in a liquid state such that at least a central core of the silicon oxycarbide-based layer is free of calcium-magnesium alumino-silicate-based material, wherein the silicon oxycarbide-based layer is thicker than the calcium-magnesium alumino-silicate-based layer.

17. The composite as recited in claim 16 , wherein the silicon oxycarbide-based material includes a dispersed phase of barium-magnesium alumino-silicate.

18. The composite as recited in claim 17 , wherein the silicon oxycarbide-based material includes, by volume, 1-30% of the dispersed phase of barium-magnesium alumino-silicate.

19. The composite as recited in claim 16 , wherein the silicon oxycarbide-based material includes a continuous matrix phase of SiO 2 or barium-magnesium alumino-silicate, and a dispersed phase of the other of barium-magnesium alumino-silicate or SiO 2 .

Assignees

• Raytheon Tech Corp
• Rtx Corp

Inventors

• Tang Xia
• Sheedy Paul
• Kashyap Tania Bhatia
• Schmidt Wayde R
• Goberman Daniel G

Classifications

• F05D2300/611

  Coating · CPC title

• F05D2300/21

  Oxide ceramics · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title

• F05D2240/30

  Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor · CPC title

• F05D2240/12

  Fluid guiding means, e.g. vanes · CPC title