Welding brazing filler metal suitable for SiC composite material

The invention belongs to the technical field of novel core cladding material manufacturing, and particularly relates to welding brazing filler metal suitable for a SiC composite material. The Ni-Cr-Hf alloy comprises the following components in percentage by mass: 50-70% of Ni, 30-35% of Cr and 5-15% of Hf. The preparation method comprises the following steps: (1) weighing each component element according to the brazing filler metal proportion, and uniformly mixing; 2) uniformly coating brazing filler metal between the end plug and the cladding; (3) the brazing filler metal is heated, all elements are melted, and alloying is achieved; (4) the cladding and the end plug are fully wetted through the molten brazing filler metal; and (5) after the brazing filler metal is solidified, the end plug is connected with the cladding. According to the brazing filler metal composition elements, on the premise of radiation resistance and avoidance principles, connection of the silicon carbide cladding and the silicon carbid