High temperature oxidation protection for composites

Patent metadata

Field	Value
Publication number	US-11091402-B2
Application number	US-201916668852-A
Country	US
Kind code	B2
Filing date	Oct 30, 2019
Priority date	Dec 15, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition comprising a first phosphate glass composition, with a primary flow modifier and a first carrier fluid, wherein the primary flow modifier comprises at least one of cellulose or calcium silicate; applying the first slurry on a surface of the composite structure to form a base layer; and heating the composite structure to a temperature sufficient to adhere the base layer to the composite structure.

First claim

What is claimed is:

1. An article, comprising:
a carbon-carbon composite structure; and
an oxidation protection system including a base layer disposed on an outer surface of the carbon-carbon structure, wherein the base layer comprises a first pre-slurry composition having a first phosphate glass composition, a primary flow modifier, and a secondary flow modifier, wherein the primary flow modifier comprises at least one of cellulose or calcium silicate, and wherein the secondary flow modifier comprises at least one of poly(vinyl alcohol) or a salt of poly(acrylic acid).

2. The article of claim 1 , wherein the first pre-slurry composition of the base layer comprises an acid aluminum phosphate wherein a molar ratio of aluminum to phosphoric acid is between 1 to 2 and 1 to 3.

3. The article of claim 1 , further comprising a sealing layer disposed on an outer surface of the base layer, wherein the sealing layer comprises a second pre-slurry composition comprising a second phosphate glass composition.

4. The article of claim 3 , wherein at least one of the first phosphate glass composition or the second phosphate glass composition is represented by the formula a(A′ 2 O) x (P 2 O 5 ) y1 b(G f O) y2 c(A″O) z :
A′ is selected from: lithium, sodium, potassium, rubidium, cesium, and mixtures thereof;
G f is selected from: boron, silicon, sulfur, germanium, arsenic, antimony, and mixtures thereof;
A″ is selected from: vanadium, aluminum, tin, titanium, chromium, manganese, iron, cobalt, nickel, copper, mercury, zinc, thulium, lead, zirconium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, actinium, thorium, uranium, yttrium, gallium, magnesium, calcium, strontium, barium, tin, bismuth, cadmium, and mixtures thereof;
a is a number in the range from 1 to about 5;
b is a number in the range from 0 to about 10;
c is a number in the range from 0 to about 30;
x is a number in the range from about 0.050 to about 0.500;
y 1 is a number in the range from about 0.100 to about 0.950;
y 2 is a number in the range from 0 to about 0.20; and
z is a number in the range from about 0.01 to about 0.5;
(x+y 1 +y 2 +z)=1; and
x<(y 1 +y 2 ).

5. The article of claim 4 , wherein the second pre-slurry composition comprises acid aluminum phosphate and wherein the second phosphate glass composition is substantially free of boron nitride.

Assignees

• Goodrich Corp
• Goodrich Coporation

Inventors

• Poteet Steven A

Classifications

• C03C8/16

  with vehicle or suspending agents, e.g. slip · CPC title

• B64C25/34

  wheeled type, e.g. multi-wheeled bogies · CPC title

• C04B41/89

  for obtaining at least two superposed coatings having different compositions · CPC title

• B64C25/36

  Arrangements or adaptations of wheels, tyres or axles in general · CPC title

• C04B35/78

  containing non-metallic materials · CPC title