Thermal shock resistance and bonding strength of integrated quasi-EBC-SiCf/SiC composites fabricated by tape casting and reactive melt infiltration

To enhance the service life and reliability of SiC f /SiC composites after EBCs exfoliation, an integrated design concept is proposed to use Si reactive melt infiltration to prepare integrated EBC- SiC f /SiC composites in this work. It can form a quasi-EBC layer with EBC components on the surface of SiC f /SiC composites. The integrated structure has stronger bonding strength than the conventional coating and matrix. During thermal shock cycling, its thermal shock resistance can be enhanced by consuming SiO 2 to form Yb 2 Si 2 O 7 with good damage tolerance. Meanwhile, the presence of quasi-EBC layer is expected to provide secondary protection for SiC f /SiC composites after conventional EBC stripping, which can improve the service life of SiC f /SiC composites. This work provides a new idea for the long-life modification of SiC f /SiC composites.