Processing and Performance of an All‐Oxide Ceramic Composite

Continuous fiber ceramic composites (CFCCs) based on oxides are of interest for high‐temperature applications owing to their inherent oxidative stability. An enabling element is a matrix with an optimum combination of toughness and strength, which may be achieved by incorporating a controlled amount of fine, well‐distributed porosity. Implementation of this concept by vacuum infiltration of aqueous mullite‐alumina slurries into two‐dimensional woven preforms of alumina fibers has been investigated. Evaluation of these materials shows stress‐strain characteristics similar to other CFCCs, especially carbon‐matrix composites. Moreover, promising notch and creep properties have been found. Microstructural and processing issues relevant to the attainment of these behaviors are discussed.