Oxidation protection of composites
AssigneeGoodrich Corporation
InventorSteven Poteet
Life of this patent
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Abstract
Systems and methods for forming an oxidation protection system on a composite structure are provided. In various embodiments, the oxidation protection system comprises a boron-glass layer formed on the composite substrate and a silicon-glass layer formed over the boron-glass layer. Each of the boron-glass layer and the silicon-glass layer include a glass former and a glass modifier. The boron-glass layer includes a boron compound comprising a mixture of boron carbide (B4C) powder and cubic boron nitride (BN) powder.
Claims20
An oxidation protection system disposed on an outer surface of a substrate, the oxidation protection system, comprising:
- a boron-glass layer disposed over the outer surface, the boron-glass layer comprising a boron compound, a first glass compound, a first glass former, and a first glass modifier, wherein the boron compound comprises a mixture of boron carbide powder and cubic boron nitride powder;
- and
- a silicon-glass layer disposed on the boron-glass layer, the silicon-glass layer comprising a silicon compound, a second glass compound, a second glass former, and a second glass modifier.
A method for forming an oxidation protection system on a carbon-carbon composite structure, comprising:
- applying a first pretreating composition to an outer surface of the carbon-carbon composite structure;
- heating the first pretreating composition;
- applying a second pretreating composition on the first pretreating composition, wherein the carbon-carbon composite structure is porous and the second pretreating composition penetrates a pore of the composite structure;
- applying a boron slurry to the carbon-carbon composite structure, wherein the boron slurry comprises a boron compound, a first glass compound, a first glass former, a first glass modifier, and a first carrier fluid, wherein the boron compound comprises a mixture of boron carbide powder and cubic boron nitride powder;
- applying a silicon slurry to the carbon-carbon composite structure, wherein the silicon slurry comprises a silicon compound, a second glass compound, a second glass former, a second glass modifier, and a second carrier fluid;
- and
- heating the carbon-carbon composite structure.
A method for forming an oxidation protection system on a brake disk, comprising:
- applying a first pretreating composition to an outer surface of a non-wear surface of the brake disk, the first pretreating composition comprising aluminum oxide and water;
- heating the first pretreating composition;
- applying a second pretreating composition comprising an aluminum salt and at least one of a phosphoric acid or an acid phosphate salt on the first pretreating composition to the non-wear surface of the brake disk, wherein the non-wear surface of the brake disk is porous and the second pretreating composition penetrates a pore of the non-wear surface of the brake disk;
- forming a boron slurry by mixing a boron compound, a first glass compound, a first glass former, a first glass modifier, and a first carrier fluid, wherein the boron compound comprises a mixture of boron carbide powder and cubic boron nitride powder;
- applying the boron slurry over the non-wear surface of the brake disk;
- forming a silicon slurry by mixing a silicon compound, a second glass compound, a second glass former, a second glass modifier, and a second carrier fluid;
- applying the silicon slurry over the non-wear surface of the brake disk;
- and
- heating the brake disk at a first temperature.
Dependencies are inferred from the claim text.