Fiber coating of unbonded multi-layers for toughening ceramic fi

Details Fiber coating of unbonded multi-layers for toughening ceramic fi Fiber coating of unbonded multi-layers for toughening ceramic fi

1991-03-13

1994-01-04

Lesmes, George F.

Compositions: ceramic

Ceramic compositions

Refractory

428367, 428368, 428378, 428380, 428384, 428902, B32B 1800, C04B 3571

Patent

active

052759849

ABSTRACT:
A composite comprising a ceramic matrix having immersed ceramic reinforcing fibers is strengthened and toughened by providing a multi-layer ceramic coating surrounding each fiber. The multiple layers in the fiber coating are not bonded to one another. As a result, the multiple layers separate from one another in the presence of an advancing crack in the ceramic matrix, thereby permitting the fibers to pull out of the matrix and avoid premature fiber breakage. The choice of materials for the fiber coating is not limited by any requirement to establish a particular type of chemical bond between the coating and the fiber. Instead, the invention relies only upon the mechanical tendency of the unbonded multiple layers in the fiber coating to separate to promote fiber pull-out from the matrix in the wake of an advancing crack.

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