Microstructure and property of low silver BAg10CuZnSnInNd filler metal

The effect of element In/Nd multi-addition on melting characteristics, wettability, microstructure and of BAg10CuZnSn filler metal and mechanical properties of brazed joints were investigated. The results indicated that In could obviously decrease the liquidus and solidus temperature of filler metal, Nd element had no obvious effect on the solid and liquidus temperature of the filler metal. The multi-addition of element In and Nd could greatly improve the spreading area and refine the microstructure of filler metal. With excess addition of In and Nd, In-riched phase and rare-earth phase observed in the matrix of filler metal. The optimal mechanical property of filler metal was obtained when the addition of In reached 2% while the addition of Nd reached 0.1%. When the content of In element and Nd element is 2% and 0.1%, respectively, the shear strength of 304 stainless steel/304 stainless steel joint reaches the maximum of 430 MPa, and the test results of the brazing joint of 304 stainless steel/copper fracture at the copper, indicating that the strength of the brazing joint is greater than that of copper.