Porosity gradient preform architecture for high temperature composites

A manufacturing method, comprising:

• forming a porosity gradient fibrous preform by:
• arranging a plurality of fabric-resin layers, each comprising a plurality of fibers and a resin, wherein a fiber volume of the plurality of fibers for each fabric-resin layer is uniform throughout the plurality of fabric-resin layers;
• and
• pyrolyzing the resin to create a sequentially increasing porosity from a center of the porosity gradient fibrous preform toward an outer surface of the porosity gradient fibrous preform.

A manufacturing method, comprising:

• forming a porosity gradient fibrous preform by:
• arranging a plurality of fabric-resin layers, each comprising a plurality of fibers and a resin, wherein a fiber volume of the plurality of fibers for each fabric-resin layer is uniform throughout the plurality of fabric-resin layers;
• mixing a carbon powder with the resin, a volume of the carbon powder decreases from a center of the porosity gradient fibrous preform toward the outer surface of the porosity gradient fibrous preform;
• and
• pyrolyzing the resin from the porosity gradient fibrous preform to create a sequentially increasing porosity from the center of the porosity gradient fibrous preform toward an outer surface of the porosity gradient fibrous preform.