Controlling interfacial reactions of Ti₃SiC₂/Ti₂AlNb brazed joints by transferring graphene layers

To address the brittle compounds formation issue during the brazing of Ti₃SiC₂/Ti₂AlNb couples, the graphene layer was transferred onto the Ti₂AlNb surface prior to the brazing process first. Then the interfacial microstructure of the Ti₃SiC₂/TiAl joints brazed with and without the transferred graphene were put into comparison. The brittle TiSiCu and Ti₅Si₃ compounds were totally suppressed and the desirable ductile AgCu eutectics were obtained. The shear strength of the joints improved from 70 MPa to 107 MPa. The transfer of the graphene layer can also be extended to other areas as a universal approach, addressing excessive interfacial reactions in future.