US 11,739,413 B2
Oxidation protection systems and methods
Atta Khan, Colorado Springs, CO (US)
Assigned to GOODRICH CORPORATION, Charlotte, NC (US)
Filed by GOODRICH CORPORATION, Charlotte, NC (US)
Filed on Jun. 5, 2019, as Appl. No. 16/432,029.
Prior Publication US 2020/0385852 A1, Dec. 10, 2020
Int. Cl. C23C 14/06 (2006.01); B64C 25/42 (2006.01); F16D 65/00 (2006.01)
CPC C23C 14/0635 (2013.01) [B64C 25/42 (2013.01); F16D 65/0025 (2013.01)] 9 Claims
 
1. A method of forming a B4C layer as a component of an oxidation protection system on a carbon-carbon composite material, the method comprising:
forming a liquid mixture comprising a boron-compound and a carbon-compound, wherein forming the liquid mixture comprises forming a solution by mixing the boron-compound into the carbon-compound, such that the boron-compound is a solute and the carbon-compound is a solvent, wherein the boron-compound is a precursor of boron carbide (B4C), the boron-compound comprising at least one of boric acid (H3BO3) and boria (B2O3) and wherein the carbon-compound comprises phenolic resin;
applying the liquid mixture on the carbon-carbon composite material, wherein the carbon-carbon composite material comprises a carbon densified carbon fiber preform; and
heating the carbon-carbon composite material after applying the liquid mixture on the carbon-carbon composite material to convert the boron-compound and the carbon-compound of the liquid mixture to boron carbide (B4C) and form a boron carbide (B4C) layer over the carbon-carbon composite material,
wherein heating the carbon-carbon composite material includes heating to between about 1800 degrees Celsius and about 2000 degrees Celsius.