Accession Number : ADD017612

Title :   Ceramic Composites with Ceramic Fibers.

Descriptive Note : Patent, Filed 7 Jan 94, patented 18 Apr 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Jessen, Todd L

Report Date : 18 Apr 1995

Pagination or Media Count : 7

Abstract : This patent discloses a preferred composite which is useful at temperatures in excess of about 1000 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 carbides fibers 5-20 microns thick; the coating on the coated fibers is boron nitride 0.l to 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. (MM)

Descriptors :   *CERAMIC MATRIX COMPOSITES, *FIBER REINFORCED COMPOSITES, *CERAMIC MATERIALS, *PATENTS, COMPOSITE MATERIALS, HIGH TEMPERATURE, TOUGHNESS, COATINGS, ZIRCONIUM, CERAMIC FIBERS, TITANATES, SILICON CARBIDES, SILICON NITRIDES

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE