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US 10,590,044 B1Granted
Engineered matrix self-healing composites
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorSai V. Raj
Life of this patent
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Abstract
An engineered matrix is provided to blunt and self-heal matrix cracks to reduce oxygen ingress into a fiber reinforced composite.
Claims20
A process for fabricating a ceramic matrix composite, comprising:
- formulating an engineered matrix (EM) composition by combining a plurality of powders, wherein the plurality of powders includes a silicon carbide (SiC) powder, a silicon nitride (Si3N4) powder, and a silicide powder;
- infiltrating a silicon carbide (SiC) preform with an EM slurry having the EM composition;
- and
- after infiltrating the SiC preform with the EM slurry, melt infiltrating silicide to fill one or more remaining spaces in the SiC preform, thereby bonding particles of the EM composition and filling internal voids, wherein the melt infiltrated silicide comprises CrSi2, CrSi, a Cr—Si alloy, or any combination thereof.
1 more element
A process for fabricating a ceramic matrix composite, comprising:
- formulating an engineered matrix (EM) composition by combining a plurality of powders, wherein the plurality of powders includes a silicon carbide powder, a silicon nitride powder, and a powder of a first silicide;
- introducing the EM composition as an EM slurry and infiltrating voids in a silicon carbide (SiC) preform with the EM slurry;
- and
- after infiltrating the voids in the SiC preform with the EM slurry, melt infiltrating a second silicide to fill one or more remaining spaces in the SiC preform, thereby bonding particles of the EM composition and filling internal voids, wherein the second silicide comprises CrSi2, CrSi, a Cr—Si alloy, or any combination thereof, wherein the second silicide has a lower melting point than the first silicide.
1 more element
Dependencies are inferred from the claim text.