Investigation of Brazing Structure of Bulk Graphite to a W-Re Substrate

The brazing structure of bulk graphite to a W-Re substrate has been investigated in the present paper. The brazing specimens used were a W-15Re substrate with a sintered density of 17.97g/cm3, and bulk graphite with a density of 1.86g/cm3. Titanium foil with a thickness of 0.05–1.5mm was used as the brazing agent. W-Re substrate and bulk graphite were brazed in a vacuum furnace. After brazing, the phase composition and structure of brazed layer were analyzed. The test results show that W-Re substrate and bulk graphite can be joined together when titanium was used as the brazing agent. Titanium and graphite react and form TiC, which has a higher melting point during brazing. The phase compositions of the brazed layer were a W-Re solid solution, TiC, and residual carbon. The metallographic structure of the brazed layer was made up of a W-Re solid solution and TiC.