Joining SiC‐Based Ceramics and Composites with Preceramic Polymers

Monolithic SiC bodies (sintered SiC, reaction bonded SiC) were successfully joined using a silicone resin. Maximum values as high as 220 MPa in bending and about 50 MPa in shear tests were reached for samples joined at 1200°C. SiC/SiCf composites were also joined using a silicone resin or a polycarbosilane and various fillers. In this case, the strength of the joints was much lower, increasing only when specific fillers or reinfiltration of the joints were employed. The reason for the lower strength possessed by SiC/SiCf joints was attributed to the surface morphology of the composites.