Vol.3 No.1 (January 2013)
Effect of Sn Content on Brazing Properties of Ag Based Filler Alloy
Sn and Ni element were introduced into Ag-Cu-Zn filler alloy, and the effect of Sn content on microstructure and brazing properties of Ag based filler alloy was analyzed by OM, SEM and XRD. The results indicated that the Ag-Cu-Zn filler alloy was mainly comprised of Ag based solid solution, Cu based solid solution and CuZn compounds. A trace amount of Ag2Cu2O occurred in the filler alloy while the content of Sn exceeded 4 wt% in the filler. However, the Cu-Sn intermetallics were not detected in the range of composition in the research. By using DSC analysis, the melting temperature of the filler alloy was decreased with increasing Sn content. The wettability test showed that the stainless steel could be wetted by the Ag-Cu-Zn based filler alloy with different Sn content. Besides, this kind of filler alloy was used to join stainless steel by torch brazing, and a compact bonding could be obtained at the substrates/filler alloy interface. The maximum joint strength could reach 450 MPa while the filler contained 3.0 wt% Sn element. While the content of Sn exceeded 3.0 wt% in the filler, the joint strength decreased sharply due to the existence of few oxides.
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