Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-02-09
1985-09-24
Metz, Andrew H.
Compositions: ceramic
Ceramic compositions
Refractory
264 65, 501 89, 501 91, C04B 3556
Patent
active
045433453
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 dispersion 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 MPa.m.sup.1/2 which represents as much as a two-fold increase over that of the matrix material.
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Chapman Terryence
Hamel Stephen D.
Hightower Judson R.
Larcher Earl L.
Metz Andrew H.
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