Rare earth modified reduced graphene oxide reinforced AgCuTi composite brazing filler for brazing C/C composites

Abstract

In order to solve the formation of brittle compounds in brazed joints, an innovative rare earth modified reduced graphene oxide reinforced AgCuTi composite brazing filler was designed to achieve brazed joints with Ag-Cu eutectic as the main organization almost free of brittle compounds, and at the same time, the dispersion of graphene in the joint interfaces was improved. Microanalysis and discussion of the brazing fillers with and without Ce modification showed that the Ce modified reduced graphene oxide was more uniformly dispersed in the brazing fillers. The interfacial microstructures of C/C composites-C/C composites joints with and without Ce modified brazing fillers were compared, and the effect of graphene content on the organization and properties of the joints was investigated. The results showed that the shear strength of the joints was significantly enhanced by using Ce modified brazing fillers. When the graphene content was 0.5 wt.%, the average shear strength of the brazed joints obtained by using Ce modified brazing fillers was 31.82 MPa, increased by 50%.