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US 4,642,271 AGranted
BN coating of ceramic fibers for ceramic fiber composites
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorRoy W. Rice
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Abstract
A ceramic fiber composite material comprised of boron nitride coated cera fibers embedded in a ceramic matrix. The boron nitride coating limits both physical bonding and chemical reaction between the fibers and matrix to improve both strength and toughness of the composite material.
Claims9
In a ceramic fiber composite, a composition comprising:
- a plurality of ceramic fibers;
- a fiber coating of boron nitride disposed over each fiber to form a plurality of coated fibers;
- and
- a ceramic matrix encapsulating said plurality of coated fibers.
1 more element
In a ceramic fiber composite, a composition comprising:
- a plurality of ceramic fibers, selected from the group of SiC, Al.sub.2 O.sub.3, and graphite fibers ranging from 5 to 10 microns in thickness;
- a fiber coating of boron nitride having a thickness in the range of 0.1 micron disposed over each fiber to form a plurality of coated fibers;
- and
- a ceramic matrix selected from the group of SiO.sub.2, SiC, ZrO.sub.2, ZrO.sub.2 -TiO.sub.2, mullite and coated carbon matrices encapsulating said plurality of coated fibers to form a composite having in the range of 40 to 60 percent of said coated fibers by volume.
1 more element
Dependencies are inferred from the claim text.