Compositions: ceramic – Ceramic compositions – Refractory
Patent
1986-04-03
1989-01-24
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 89, 501 91, 264 65, C04B 3556, C04B 3580, C04B 3510
Patent
active
RE0328430
ABSTRACT:
The present invention is directed to the fabrication of ceramic composites which possess improved mechanical properties especially increased fracture toughness. In the formation of these ceramic composites, the single crystal SiC whiskers are mixed with fine ceramic powders of a ceramic material such as Al.sub.2 O.sub.3, mullite, or B.sub.4 C. The mixtures which contain a homogeneous disperson of the SiC whiskers are hot pressed at pressures in a range of about 28 to 70 MPa and temperatures in the range of about 1600.degree. to 1950.degree. C. with pressing times varying from about 0.75 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness of up to about 9 MP.am.sup.1/2 which represents as much as a two-fold increase over that of the matrix material.
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Bell Mark L.
Martin Marietta Energy Systems Inc.
McKenzie-Wardell D. Barbara
Winchell Bruce M.
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