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US 4,992,318 AGranted
Laminated hybrid ceramic matrix composites
AssigneeCorning Incorporated
InventorKishor P. Gadkaree
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Abstract
Novel ceramic matrix composition comprising toughened ceramic layers interlaminated with fiber-reinforced ceramic layers and offering improved off-axis and axial properties, are described. The fiber-reinforced layers comprise inorganic reinforcing fibers disposed in a ceramic matrix material, with the reinforcing fibers being oriented along axes parallel with the planes of the layers, while the toughened ceramic layers comprise inorganic whiskers or chopped fibers randomly oriented in the layers.
Claims8
A laminated ceramic matrix composite article comprising:
- one or more fiber-reinforced layers comprising long inorganic fibers disposed in a ceramic matrix material, wherein the fibers are oriented along axes parallel with the planes of the layers and wherein the ceramic matrix material is substantially free of inorganic whiskers and chopped fibers;
- and
- one or more toughened ceramic matrix layers interlaminated with and integrally bonded to the fiber-reinforced layers, said toughened ceramic matrix layers comprising inorganic whiskers or chopped fibers randomly oriented in a ceramic matrix material, wherein said ceramic matrix material is substantially free of long oriented inorganic fibers, and wherein said whiskers and said chopped fibers comprise less than 25% by weight of said toughened ceramic matrix layers;
- and wherein the ratio of the elastic modulus of said toughened ceramic matrix layers to the elastic modulus of said fiber-reinforced layers does not exceed about 1.1.
1 more element
Dependencies are inferred from the claim text.