Concept for a damage-tolerant ceramic composite with ''strong'' interfaces

A ceramic-matrix composite (CMC) that exhibits damage-tolerant behavior without ''weak'' interfaces has been demonstrated. The concept relies on the heterogeneous distribution of fiber bundles within a porous matrix having homogeneous, fine porosity, It also depends on the development of residual stress from thermal expansion mismatch. The present demonstration uses Al2O3 fibers with either a silicon nitride or a mullite matrix, The latter is inherently oxidation resistant.