Accession Number : ADD016315

Title :   Ceramic Composites with Ceramic Fibers.

Descriptive Note : Patent Application, Filed 7 Jan 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Jessen, Todd

Report Date : 07 Jan 1994

Pagination or Media Count : 18

Abstract : A preferred composite which is useful at temperatures in excess of about 1000 deg C comprising a ceramic matrix and 40-60% on volume basis of coated and uncoated fibers embedded in the matrix generally parallel to each other and in a controlled arrangement; the matrix is selected from the group consisting essentially of silicon nitride, silicon carbide and zirconium titanate; the fibers are silicon carbide 'fibers 5-20 microns thick; the coating on the coated fibers is boron nitride 0.1-0.3 microns thick; cross-section of the composite contains about one half, on volume basis, of uncoated fibers in one band extending from one side edge of the cross-section to the opposite side edge; the composite having unexpectedly improved strength and/or toughness compared to a composite composed of only coated or only uncoated fibers.

Descriptors :   *BORON NITRIDES, *PATENT APPLICATIONS, *CERAMIC FIBERS, CARBIDES, COATINGS, CROSS SECTIONS, EDGES, FIBERS, NITRIDES, SILICON CARBIDES, SILICON NITRIDES, TEMPERATURE, TITANATES, TOUGHNESS, VOLUME, ZIRCONIUM, FIBER REINFORCED COMPOSITES

Subject Categories : Refractory Fibers

Distribution Statement : APPROVED FOR PUBLIC RELEASE