Effect of brazing technology on structure and property of brazed joint between graphite and TZM alloys with Ti filler

The effects of brazing temperature and time on the structure and property of the brazed joint between graphite and TZM alloys with Ti-based filler in vacuum were presented.The results show that the brazed joint is made up of two layers:reaction layer of Ti-TiC and solid solution layer of Ti-Mo.In some extent,the thickness of the brazing seam increases with the increasing of brazing temperature and time.After the brazing parameter being optimized,the thickness of the reaction layer is about 30-40μ m and the solid solution layer is about 70-80μ m.The structure of the brazed joint is uniform and the interface of graphite and TZM alloys is smooth.The shear-resistant strength of the brazed joint reaches 14.1-15.0 MPa.The remelting temperature is up to 1600℃ and thus the brazed joint can bear the thermal cycling from room temperature to 1600℃ without failure.