A high temperature Ti-Si eutectic braze for joining SiC

摘要

22Ti-78Si(wt.%) eutectic braze was prepared through the non-consumable arc-melting technology. Wetting behavior of the braze on silicon carbide (SiC) was investigated by means of sessile drop method in vacuum at 1400 ℃ for 10 min. The result indicates that the braze exhibits good wettability (contact angle 25°) and adhesion with SiC. Main reasons are that TiC which owns higher surface energy is formed on SiC surface and the braze has an appropriate coefficient of thermal expansion (CTE) to that of SiC.