Oxidation protection for carbon/carbon composite and graphite friction materials
AssigneeHoneywell Advanced Composites Inc.
InventorPaul E. Gray
Life of this patent
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Abstract
The invention provides for oxidatively resistant surface coated carbon/carbon composites and other graphite-like material, a method for the preparation of these materials, and their use in high temperature applications, preferably in brake for airplanes. The surface coated carbon/carbon composite or graphite-like material, which is resistant to oxidation at high temperatures comprises a fiber-reinforced carbon/carbon composite or graphite having a First Coating (A) of silicon and/or silicon carbide, and a Second Coating (B) comprising a material containing phosphorus chemically bound to oxygen which is chemically bound to silicon.
Claims20
A surface coated carbon/carbon composite or graphite-like material, which is resistant to oxidation at high temperatures comprising:
- (A) a first coating of silicon and/or silicon carbide, and
- (B) a second coating comprising a material containing phosphorus chemically bound to oxygen and said oxygen is chemically bound to silicon, wherein the second coating (B) is prepared from a slurry mixture comprising phosphoric acid and a glass frit, and
- wherein the glass frit has a fusion temperature of at least 1700° F. and a flow temperature of at least 2000° F.
A process for preparing a surface coated carbon/carbon composite or graphite-like material, which is resistant to oxidation at high temperatures comprising:
- coating a carbon/carbon composite or graphite-like material with silicon and/or silicon carbide to form a first coating (A), and
- coating an outer surface of the first coating (A) with a slurry mixture comprising phosphoric acid and a glass frit to form a second coating (B), and wherein the glass frit has a fusion temperature of at least 1700° F. and a flow temperature of at least 2000° F.
A glass frit slurry comprising a glass frit and concentrated phosphoric acid, wherein the glass frit has a fusion temperature of at least 1700° F. and a flow temperature of at least 2000° F.
A surface coated carbon/carbon composite or graphite-like material, which is resistant to oxidation at high temperatures comprising:
- (A) a first coating of silicon and/or silicon carbide, and
- (B) a second coating comprising a material containing glass frit particles and phosphorus chemically bound to oxygen and said oxygen is chemically bound to silicon;
- wherein there is a cementitious bond between the first coating (A) and the glass frit particles of the second coating (B).
Dependencies are inferred from the claim text.