High-Temperature Permanent Joints of Carbon Fiber-Reinforced Ceramic-Matrix Composites with Similar and other Carbonaceous Materials

The authors have analyzed the use of soldering, as well as reaction and gas-phase bonding and adhesion methods to obtain high-temperature permanent joints between silicon carbide ceramic-matrix composites (CMC) and similar materials, as well as carbon-carbon materials (CCM) and graphite. As discussed in the paper, the main problems when joining CMCs with carbonaceous materials occur due to poor CMC wettability with molten metals, significant difference in the TCLE values between CMC and soldering alloys, and the formation of very hard and brittle substances in the bonding layer. A review of the practical experience in applying soldering, as well as reaction and gas-phase bonding and adhesion methods for joining the C f /SiC-type CMCs with various carbonaceous materials was performed. The most typical compositions of solders and adhesives, as well as technological conditions of the joining processes were considered. It was shown that such technologies enable reliable and durable joints between the CMC parts and various types of carbonaceous materials.