5.5 Oxide/Oxide CMCs – Porous Matrix Composite Systems; Composites With Interface Coatings

This chapter compiles information about ceramic matrix composites (CMC) based on all-oxide materials (Ox-CMCs). The development of oxide–oxide composites started effectively in the 1990s, aiming for applications under oxidizing environments. Nowadays, these composites have reached a good level of maturity, showing a damage tolerant behavior by either porous matrix systems or fiber coatings, tensile strength of about 200 MPa, and excellent chemical stability due to their oxide nature. This chapter is then focused on presenting an overview about the developments and processing methods of Ox-CMCs and its constituents, fibers and matrices systems. Their key properties are addressed in details with examples of commercially available composites. Importance is also given to the main limitation of oxide systems in relation to thermal degradation and creep behavior. For a better understanding of Ox-CMCs capacity, actual industrial applications are reported in the fields of aviation, aerospace, heat-treatment furnaces, etc. Additionally, comments about the future development of this class of material are given in the end.