Fibrous monolithic ceramic and method for production
AssigneeThe United States of America as represented by the Secretary of Commerce
InventorWilliam S. Coblenz
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Abstract
The present invention is a fibrous monolithic ceramic product of high deny and a process for making the product. The product has a microstructure of coated fibers with planes of weakness between a core of each coated fiber and its respective coat or between each coated fiber and adjacent coated fibers, thereby toughening the product. The planes of weakness are sufficiently weak to deflect a crack from normal to the plane of weakness to a direction parallel to the plane of weakness. The green body from which the product is formed, can be plastically deformed at room temperature, formed in near-net-shape, and densified by pressureless sintering.
Claims13
A fibrous, monolithic ceramic body consisting essentially of
- a plurality of compacted coated fibers, each coated fiber comprising a core fiber coated by a first debonding coat, said core fibers comprised of a first ceramic composition and said first debonding coat comprising a second ceramic composition which is different from said first composition;
- said first and said second composition defining a plane of weakness comprising an interface between said first coat and said first coat's respective core fiber, wherein said interface is relatively weaker than said core fibers;
- and said coat and core are thermodynamically compatible.
A fibrous, monolithic ceramic body consisting essentially of a plurality of compacted coated fibers, each coated fiber comprising a core fiber coated by a first coat, said core fibers comprised of a first ceramic composition and said first coat comprising a second ceramic composition which is different from said first composition;
- said first and said second composition reacting to form a bonding phase, said bonding phase located at an interface between said core fiber and first coat and said bonding phase is weak relative to said core fiber, thereby forming said plane of weakness, said coat and core being thermodynamically compatible.
Dependencies are inferred from the claim text.