The interlayer self-reinforcement and filler re-optimization achieving multiple collaborative enhancement of the brazed superalloy heterogeneous joint

Under harsh service conditions, it is very difficult to achieve multi-scale diversified synergy of the heterogeneous brazed joint. The ideal brazed joint should build a “morphology-structure-stress" synergy mode to achieve high-quality and high-reliability brazing. In this paper, the graphene nickel-based foam self-reinforcement was realized by upgrading the in-situ compression, to construct the foam-filler integrated interlayer, and then realize the filler re-optimization. The multi-interface fusion of graphene non-metallic properties and nickel-based skeleton metallic properties effectively inhibited intermetallic compounds. Micro-scale SEM and nano-scale TEM were used to jointly characterize the microstructure, and the 3D structure was thinning layer by layer in the joint fracture, which fully verified the high stability of high-density foam. The room temperature shear strength was as high as 434 MPa, and the properties were almost without damage after 200 cycles of high-low temperature life. This research could provide technical support for the microstructure-property regulation of next-generation aero engines.