Joining of activated graphite to 6063 aluminum alloy with Al-Cu-Si-Ni-Mg filler metal

In this work, 6063 aluminum alloy-graphite joint intended for thermal conductive application were realized by applying Al-Cu-Si-Ni-Mg brazing filler metal and Ag-Cu-Ti pasted on high density graphite substrate to ensure wetting during the brazing process. The interface reactions during brazing and mechanical properties were studied using scanning electron microscopy (SEM) and shear test device. TiC was formed at the graphite/active Ag-Cu-Ti paste interface due to the reaction between Ti and C, and thus the wettability on the graphite was improved.It is shown that joint with a good quality can be produced at a brazing temperature of 550 ℃ for 10 min.The average tensile strength of the joint is 21MPa. thus the wettability on the graphite was improved.It is shown that joint with a good quality can be produced at a brazing temperature of 550 ℃ for 10 min.