US 12,330,996 B2
High temperature oxidation protection for carbon-carbon composites
Atta Khan, Colorado Springs, CO (US)
Assigned to GOODRICH CORPORATION, Charlotte, NC (US)
Filed by Goodrich Corporation, Charlotte, NC (US)
Filed on May 5, 2021, as Appl. No. 17/308,776.
Prior Publication US 2022/0356123 A1, Nov. 10, 2022
Int. Cl. C04B 41/50 (2006.01); C04B 41/89 (2006.01); C04B 35/83 (2006.01); C04B 111/00 (2006.01)
CPC C04B 41/5031 (2013.01) [C04B 41/5006 (2013.01); C04B 41/5035 (2013.01); C04B 41/5058 (2013.01); C04B 41/5059 (2013.01); C04B 41/5066 (2013.01); C04B 41/89 (2013.01); C04B 35/83 (2013.01); C04B 41/5023 (2013.01); C04B 2111/00362 (2013.01); C04B 2111/00982 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for forming an oxidation protection system on a composite structure, comprising:
applying a ceramic layer slurry to the composite structure, wherein the ceramic layer slurry comprises (i) at least one of elemental aluminum or an alloy of aluminum, and (ii) at least one of elemental silicon or an alloy of silicon, in a solvent or carrier fluid;
heating the composite structure to above 1000° C. in an environment comprising nitrogen gas to form a ceramic layer on the composite structure, wherein the at least one of the elemental aluminum or the alloy of aluminum reacts with the nitrogen gas such that, as a result, the ceramic layer comprises aluminum nitride;
applying a sealing slurry to the composite structure, wherein the sealing slurry comprises a sealing pre-slurry composition and a sealing carrier fluid, wherein the sealing pre-slurry composition comprises a sealing phosphate glass composition; and
heating the composite structure to form a sealing layer on the composite structure.