Silicon carbide ceramic matrix composites

Patent metadata

Field	Value
Publication number	US-9650303-B2
Application number	US-201314143724-A
Country	US
Kind code	B2
Filing date	Dec 30, 2013
Priority date	Mar 15, 2013
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

Ceramic matrix composite materials and processes for making said composite materials are disclosed.

First claim

What is claimed is:

1. A method of producing a silicon carbide (SiC) ceramic matrix composite (CMC), the method comprising:
forming a SiC fiber preform;
incorporating a slurry comprising yttrium or ytterbium into the SiC fiber perform via slurry infiltration; and
infiltrating the SiC fiber perform with a melt comprising silicon, therby forming the SiC ceramic matrix composite.

2. The method of claim 1 , wherein the slurry further comprises SiC.

3. The method of claim 1 , wherein the slurry comprises metallic yttrium, metallic ytterbium, yttrium oxide, ytterbium oxide, yttrium silicate and/or ytterbium silicate.

4. The method of claim 1 , wherein the slurry further comprises aluminum oxide.

5. The method of claim 1 , wherein the melt comprises a eutectic ally selected from a Y—Al—Si eutectic alloy and a Yb—Al—Si eutectic alloy.

6. The method of claim 1 , wherein the composite comprises a Y—Si—O compound and/or a Yb—Si—O compound.

7. The method of claim 6 , wherein the composite comprises yttrium silicide and/or ytterbium silicide selected from the group consisting of YSi, Y 5 Si 4 , Y 5 Si 5 , and YbSi.

8. The method of claim 1 , further comprising before the slurry infiltration, applying a fiber interface coating to the SiC fiber preform, the fiber interface coating comprising carbon, carbon nitride, boron nitride, silicon-doped boron nitride, silicon notride, or SiNC.

9. The method of claim 8 , further comprising, after applying the fiber interface coating, depositing a SiC matrix layer by chemical vapor infiltration.

10. The method of claim 9 , wherein the composite comprises:
the SiC fiber preform at 15-45 vol. % ;
the fiber interface coating at 1-10 vol. % ;
the SiC matrix layer at 10-30 vol. % ;
slurry additives at 10-30 and
melt infiltration additives at 5-20 vol. % .

11. The method of claim 1 , wherein the slurry includes from 3% to 100% by volume of yttrium silicate and/or ytterbium silicate and from 0 vol. % to 97 vol. % SiC.

12. The method of claim 1 , wherein the slurry comprises SiC, alumina, yttrium oxide and/or ytterbium oxide.

13. The method of claim 1 , wherein the slurry further comprises gadolinium oxide, erbium oxide, or lutetium oxide.

Assignees

• Rolls Royce Corp

Inventors

• Chamberlain Adam L
• Lazur Andrew J
• Lee Kang N

Classifications

• C04B2235/3891

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

• C04B2235/428

  Silicon · CPC title

• C04B2235/5244

  Silicon carbide · CPC title

• C04B35/62873

  Carbon · CPC title

• C04B35/62868

  Boron nitride · CPC title