Composites comprising silicon carbide fibers dispersed in magnes

Details Composites comprising silicon carbide fibers dispersed in magnes Composites comprising silicon carbide fibers dispersed in magnes

1988-08-11

1989-10-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 56, 264 66, 264320, B29C 6704, B29C 4300, C04B 3332

Patent

active

048714968

ABSTRACT:
A novel ceramic-ceramic composite of a uniform dispersion of silicon carbide fibers in a matrix of MgO.multidot.nAl.sub.2 O.sub.3 wherein n ranges from about 1 to about 4.5, said composite comprising by volume from 1 to 50% silicon carbide fibers and from 99 to 50% MgO.multidot.nAl.sub.2 O.sub.3. The composite is readily fabricated by forming a powder comprising a uniform dispersion of silicon carbide fibers in poorly crystalline phase comprising MgO and Al.sub.2 O.sub.3 in a mole ratio of n and either (a) hot pressing or preferably (b) cold pressing to form a preform and then forging utilizing a temperature in the range of 1100.degree. C. to 1900.degree. C. and a strain rate ranging from about 10.sup.-5 seconds .sup.-1 to about 1 seconds .sup.-1 so that surfaces cracks do not appear to obtain a shear deformation greater than 30%.

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