High-strength high-temperature-resistant NiTi-based brazing filler metal and preparation method and application thereof

The invention provides high-strength high-temperature-resistant NiTi-based brazing filler metal and a preparation method and application thereof, and belongs to the technical field of silicon carbide-based materials. The invention provides high-strength high-temperature-resistant NiTi-based brazing filler metal. The high-strength high-temperature-resistant NiTi-based brazing filler metal comprises the following components: 24-65 wt.% of Ni, 35-77 wt.% of Ti and 1-60 wt.% of Mo. By adding Mo, the brazing filler metal can generate a high-melting-point, high-temperature-resistant and low-thermal-expansion-coefficient phase in the brazing process to replace a low-temperature phase, the residual stress in a silicon carbide-based material joint is relieved, the purpose of eliminating a low-temperature Ni-Si phase in a weld joint interface area is achieved, meanwhile, the reinforcing phase MoSi2 is high in melting point and has good thermal conductivity and high-temperature performance, and the welding quality is im