Ti Metallization of Cf/SiC Composites Surface by Molten Salt Reaction

Ti metallized coating was prepared on the surface of carbon fiber reinforced silicon carbide matrix (Cf/SiC) composite by molten salt reaction to make joining the composite with high melt point metals such as Ti. The morphologies and compositions of Ti metallized coating were analyzed by SEM and EDS. The phase components were assessed by XRD. The wettability of the solder was measured by quantitative metallography. The results show that Ti metallized coating is uniform and dense, and bound with the matrix closely. Ti can infiltrate into the gaps of the fibers, and cover the surfaces of the Cf/SiC composite. The main phases of the metalized coating consist of TiC and Ti5Si3. There are three transition layers between SiC and the metallized, i. e. Ti5Si3 layer, TiC layer and Ti5Si3 layer. The wettability of Cf/SiC composites surface to Ti is greatly improved by metallization, and the contact angle is deceased from 153.9° to 13.2° at 950 °C.