Porosity gradient preform architecture for high temperature composites
AssigneeRohr, Inc.
InventorsBRYAN THAI, VIJAY V. PUJAR, KATHERINE E. WAUGH, CHRISTOPHER C. KOROLY
Life of this patent
Estimating the term…
Abstract
A porosity gradient fibrous preform includes a plurality of fabric-resin layers and a plurality of pore formers. Each fabric-resin layer includes a plurality of fibers and a resin. A volume of the plurality of pore formers sequentially increases from a center of the porosity gradient fibrous preform toward an outer surface of the porosity gradient fibrous preform. The pore formers can be pyrolyzed from the preform to create paths through the porosity gradient fibrous preform for infiltration of a fluid.
Claims20
A porosity gradient fibrous preform comprising:
- a plurality of fabric-resin layers, each comprising a plurality of fibers and a resin;
- and
- a plurality of pore formers mixed with the resin, a volume of the plurality of pore formers sequentially increases 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;
- mixing a plurality of pore formers with the resin, a volume of the plurality of pore formers sequentially increases from a center of the porosity gradient fibrous preform toward an outer surface of the porosity gradient fibrous preform;
- and
- pyrolyzing the plurality of pore formers from the porosity gradient fibrous preform to create a path through the porosity gradient fibrous preform for infiltration of a fluid.
A manufacturing method, comprising:
- forming a porosity gradient fibrous preform by:
- positioning a second fabric-resin layer over a first fabric-resin layer having a first plurality of fibers, a first resin, and a first plurality of pore formers, the second fabric-resin layer having a second plurality of fibers, a second resin, and a second plurality of pore formers, the second fabric-resin layer being positioned further outward from a center of the porosity gradient fibrous preform than the first fabric-resin layer;
- applying a first heat to the second fabric-resin layer and the first fabric-resin layer;
- expanding the second plurality of pore formers so that a volume of the second plurality of pore formers is greater than a first volume of the first plurality of pore formers;
- and
- pyrolyzing the first plurality of pore formers and the second plurality of pore formers from the porosity gradient fibrous preform to create a path through the porosity gradient fibrous preform for infiltration of a fluid.
Dependencies are inferred from the claim text.