Ceramic fibers provide the skeletal structure of ceramic matrix
composites (CMCs) and are major contributors to the composite's
mechanical and physical properties. The network of ceramic fibers
maintains the structural integrity of the composite during matrix
cracking, thus increasing the composite's tolerance to damage.
coatings contribute to the chemical stability between the fiber and the
matrix and service environments. They also provide a weak interface
between the brittle ceramic matrix and the ceramic fiber, enabling
“pseudoductility” in the CMC. Fibers and coatings together provide the
damage tolerance that gives CMCs their robustness.
This report focuses on fibers and coatings and on identifying directions for research and development that would lead to improvements in CMC components for high-temperature applications.