Ceramic composites with ceramic fibers

Details Ceramic composites with ceramic fibers Ceramic composites with ceramic fibers

1994-01-07

1995-04-18

Ryan, Patrick J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

428244, 428295, 428296, 428297, 428298, 428303, 428366, 428379, 428380, 428381, 428384, 428387, 428389, 428392, B32B 900

Patent

active

054077400

ABSTRACT:
A preferred composite which is useful at temperatures in excess of about 0.degree. 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 0.1-0.3 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.

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