Ceramic-metal connection has a vast difference on thermal expansion coefficient between two materials and low wettability of the ceramic on the surface of metal due to the difference between atomic identities. Aerospace and nuclear industries use such ceramic-metal joints. In this research, brazing and GTAW of C-SiC to Mo and Mo to Mo were investigated. Nickle thin film, BNi2, Ag-Cu, and Ti-based powder interlayers were used for brazing of the composite. No connection between C-SiC and Mo was formed in none of the interlayers mentioned above. GTAW of C-SiC to Mo was conducted using of some fillers. Among all fillers, NiCrMo2 filler was able to make a connection between composite and metal. The results showed that due to the high ductile to brittle transition temperature and diffusion of Oxygen gas into the melt pool, some cracks were propagated in the joint area and heat affected zone. GTAW of Mo to Mo using three fillers named 309, NiCrMo1, and NiCr3 were performed; however, no connection was obtained. Brazing of Mo to Mo using BNi2 interlayer was successful. The connections were made at constant 1050 °C for 5, 15, 30, and 60 min. The results showed that at 5 min, non-isothermal solidification was occurred at the joint zone due to lack of time. Increasing time to 15 min made non-isothermal solidification zone became smaller and it was lost for 30 min. Increasing time to 60 min broadened the isothermal solidification zone. Shear strength test on the samples was performed and the results showed that the highest shear strength was obtained about 213MPa for the sample welded for 60 min. Keywords: C-SiC, Molybdenum, Brazing, Interlayer, GTAW.
