Porous metal sandwich structure has light weight

high specific strength and stiffness

high temperature and corrosion resistance

sound dissipation

heat insulation and other excellent properties. The application of high-end equipment in the aerospace field is receiving more and more attention. Brazing is the preferred method to realize the joining between core and face sheets of porous metal sandwich structure. However

the process of large area brazing of  core and face sheets is prone to defects such as melting of brazing filler to thin-walled base metals

low brazing rate

large brazing deformation and formation of continuous brittle reaction products at the interface

so large area brazing of porous metal sandwich structure is still difficult

and basic research on brazing of porous metal sandwich structure is urgently needed. Scholars at home and abroad pay attention to the adjusting of joining interface micro-reaction products for the type and distribution

dissolution prediction of thin-walled base metals

welding heat deformation control of thin-walled  core and other challenges. The study about new methods of brazing interface microstructure control

brazing process– morphology of brazing fillet–microstructure of brazed joint–the mechanical properties of the joint was conducted to clarify the microstructure evolution of the brazed joint and optimize the mechanical properties of the joint. It has important scientific significance and the value of application. The progress of domestic and international research is reviewed in terms of the interface micro-zone control of the brazed joint of the metal porous sandwich structure

the micro-morphological design of the brazed joint based on the optimization of mechanical properties

the effect of the brazing process on the mechanical properties of the structure

and the predictive model for dissolution of base metals in molten brazing filler metal

respectively.