Joining of Silicon Carbide to Ferritic Stainless Steel Using a W–Pd–Ni Interlayer for High‐Temperature Applications

For silicon carbide (SiC) ceramics to be used either as structural materials or as functional components, combinations of SiC with metals are frequently encountered. Joining of SiC to ferritic stainless steel has been successfully realized using W–Pd–Ni as an interlayer for high‐temperature applications (∼600°C). A two‐step joining experiment was performed using the powder metallurgical method. Microstructural evaluation revealed that both the SiC/W–Pd–Ni and the W–Pd–Ni/steel interfaces are bonded well, and interdiffusions as well as chemical interfacial reactions occur in the reaction zone. The microstructural evolution and formation mechanism of the reaction layers were analyzed. The apparent shear strength and hardness of the joints were measured. The effects of joining temperature and holding time on the interfacial microstructure development and the strength of the joints were also investigated.