Carbon-carbon composites including isotropic carbon encapsulating layer and methods of forming the same

摘要

A technique of forming a carbon-carbon composite material includes infusing a liquid carbonizable precursor into a porous preform, and the infused precursor is subsequently pyrolyzed to convert the precursor to isotropic carbon. The preform then can be densified with a densifying agent, followed by infusion of the liquid carbonizable precursor into the densified preform. In some examples, after pyrolyzing the liquid carbonizable precursor, isotropic carbon extends substantially throughout a volume of the carbon-carbon composite material.

主权项

1. A method comprising:
infusing a first liquid carbonizable precursor into a porous preform; pyrolyzing the first liquid carbonizable precursor to convert the first liquid carbonizable precursor to porous isotropic carbon; infusing a densifying agent into the porous preform including the porous isotropic carbon; pyrolyzing the densifying agent to form porous anisotropic carbon from the densifying agent; infusing a second liquid carbonizable precursor into the porous preform including the porous anisotropic carbon; and pyrolyzing the second liquid carbonizable precursor to convert the second liquid carbonizable precursor to isotropic carbon and form a carbon-carbon composite material.