Environmental barrier fiber coating

Patent metadata

Field	Value
Publication number	US-9676674-B2
Application number	US-201414207102-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 14, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A fiber having an environmental barrier coating is provided that includes, in one illustrative form, a Hi Nicalon preform assembled in a tooling for chemical vapor infiltration and cleaned to remove sizing char from fibers of the Hi Nicalon preform; a ytterbium doped silicon carbide coat located over the Hi Nicalon preform; a boron nitride interface coat applied over the ytterbium doped silicon carbide coat; and a silicon carbide coat applied over the boron nitride interface coat.

First claim

What is claimed is:

1. Fibers having an environmental barrier coating, comprising:
a fiber preform;
a ytterbium doped silicon carbide coat located directly on the fiber preform;
a boron nitride interface coat applied over the ytterbium doped silicon carbide coat; and
a silicon carbide coat applied over the boron nitride interface coat.

2. The fibers having the environmental barrier coating of claim 1 , wherein the boron nitride interface coat has a thickness of about 0.5 μm.

3. The fibers having the environmental barrier coating of claim 1 , wherein the silicon carbide coat has a thickness of about 2 μm.

4. The fibers having the environmental barrier coating of claim 1 , wherein the fiber preform includes about 36% fiber volume.

5. The fibers having the environmental barrier coating of claim 1 , wherein the preform is completed with slurry and melt infiltration.

6. The fibers having the environmental barrier coating of claim 1 , wherein the ytterbium doped silicon carbide coat is applied by chemical vapor infiltration.

7. The fibers having the environmental barrier coating of claim 1 , wherein the silicon carbide coat is applied by chemical vapor infiltration.

8. The fibers of claim 1 , wherein the fiber preform comprises carbon fibers, silicon carbide fibers, alumina fibers, aluminosilicate fibers, SiNC fibers or glass fibers.

9. The fibers of claim 8 , wherein the fiber preform comprises silicon carbide fibers.

10. The fibers of claim 9 , wherein the silicon carbide fibers comprise Hi Nicalon fibers.

11. The fibers of claim 1 , wherein the fiber preform does not include sizing char.

Assignees

• Rolls Royce Corp

Inventors

• Lazur Andrew J

Classifications

• C04B2235/614

  Gas infiltration of green bodies or pre-forms · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title

• C04B41/85 Primary

  with inorganic materials · CPC title

• C04B35/565

  based on silicon carbide · CPC title