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 investi gated in the present paper The brazing specimens used were a W-15Re substra te with a sintered density of 17.97g/cm(3), and bulk graphite with a densit y of 1.86g/cm(3). 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 laye r were analyzed. The test results show that W-Re substrate and bulk graphit e can be joined together when titanium was used as the brazing agent. Titan ium and graphite react and form TiC, which has a higher melting point durin g brazing. The phase compositions of the brazed layer were a W-Re solid sol ution, TiC, and residual carbon. The metallographic structure of the brazed layer was made up of a W-Re solid solution and TC. (C) Elsevier Science In c., 2000. All rights reserved.