Weak frangible fiber coating with unfilled pores for toughening

Details Weak frangible fiber coating with unfilled pores for toughening Weak frangible fiber coating with unfilled pores for toughening

1991-03-13

1993-06-22

Robinson, Ellis P.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428368, 428375, 428378, 428380, 428384, 428689, 428698, 428699, 428701, 428702, 428704, 501 95, B32B 1800

Patent

active

052215784

ABSTRACT:
A ceramic fiber/ceramic matrix composite has ceramic fibers and a porous coating on the fibers. A ceramic matrix contacts the porous coating, the fiber and coating being immersed in the ceramic matrix. The porous coating is selected from the group including Si.sub.3 N.sub.4, SiC, ZrO.sub.2, Al.sub.2 O.sub.3, SnO.sub.2 and Ta.sub.2 O.sub.5. The pores are generally empty so as to render the coating frangible to promote fiber de-bonding and pull-out in the wake of an advancing crack in the matrix. In order to keep the pores empty, a non-porous sealing layer is formed over the porous coating which closes the pores without filling them. The ceramic matrix remains generally outside of the pores, whereby said pores remain empty after the fiber and coating are immersed in the ceramic matrix.

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