Environmental barrier fiber coating

Patent metadata

Field	Value
Publication number	US-2017240474-A1
Application number	US-201715591777-A
Country	US
Kind code	A1
Filing date	May 10, 2017
Priority date	Mar 14, 2013
Publication date	Aug 24, 2017
Grant date	—

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 . A fiber having an environmental barrier coating, the fiber comprising:
a silicon carbide fiber; an environmental barrier coating comprising yttrium doped silicon carbide on the silicon carbide fiber; and an interface coating comprising silicon doped boron nitride applied over the environmental barrier coating.

2 . The fiber of claim 1 , further comprising a structural coating applied over the interface coating.

3 . The fiber of claim 2 , wherein the structural coating comprises multiple layers.

4 . The fiber of claim 3 , wherein the multiple layers include a silicon nitride layer and a silicon carbide layer.

5 . The fiber of claim 4 , wherein the silicon nitride layer is about 0.3 μm in thickness and the silicon carbide layer is about 0.1 μm in thickness.

6 . The fiber of claim 1 , wherein the environmental barrier coating has a thickness from about 0.01 micron to about 2 microns.

7 . The fiber of claim 6 , wherein the environmental barrier coating has a thickness of 1 μm.

8 . The fiber of claim 1 , wherein the interface coating has a thickness of about 0.3 μm.

9 . The fiber of claim 1 , wherein the environmental barrier coating is bonded to the silicon carbide fiber.

10 . The fiber of claim 1 , further comprising other functional coatings between the environmental barrier coating and the interface coating.

11 . The fiber of claim 1 , wherein the silicon carbide fiber comprises a Hi Nicalon S fiber.

12 . The fiber of claim 1 , wherein the silicon carbide fiber is coated in tow form.

Assignees

• Rolls Royce Corp

Inventors

• Lazur Andrew J

Classifications

• C04B35/62894

  with more than one coating layer · CPC title

• C04B35/62868

  Boron nitride · CPC title

• C04B2235/5248

  Carbon, e.g. graphite · CPC title

• C04B35/62863

  Silicon carbide · CPC title

• C04B35/52

  based on carbon, e.g. graphite · CPC title