Aeroplane engine is large thrust, fuel temperature is high, the structural materials used are mostly titanium alloys and high-temperature super alloys, especially high-temperature alloys, their fusion welding performance is generally very poor, therefore, mainly rely on vacuum diffusion brazing or gas shielded brazing for joint.

For example, engine guide vanes, high-pressure turbine guide blades, rotor blades, rectifiers, diffusers, combustion chamber fuel nozzles, engine undercabins, engine heaters, combustion chamber and exterior bushings, honeycomb structures for sealing and heat exchange, etc. are all manufactured by vacuum brazing or diffusion welding.

The satellite manufacturing industry also uses brazing and diffusion welding technology, including waveguide microwave devices, titanium conduits, and capillary tubes at the head of satellite attitude control engines.

Among them, heat exchangers, honeycomb structures, turbine blades, nozzles, compressors, combustion chambers, etc. all use high-temperature brazing. Among them, Ni-Cr-B-Si series filler is used the most. Ni-Cr-Si series is also used for parts or thin-walled structures with high oxidation resistance requirements. Therefore, how to choose aerospace brazing materials is also a problem that needs attention.