Abstract
Diffusion brazing mechanism of two dissimilar alloys Ni 270 and Ductile cast iron(DCI) by BAg-5 and BAg-7 filler metal with bonding time of 10 min was investigated. Shear strength test was performed to evaluate mechanical properties. The bonding phase for joining side nickel by using the two type of filler metal alloy BAg-5 and BAg-7 is the NiCu phase with shear strength about 70 Mpa, and the bonding phase for joining side ductile cast iron by using the two type of filler metal alloy BAg-5 and BAg-7 is the Fe3Si and SiC phase with shear strength about 40 Mpa. The joining of nickel 270 plate and ductile cast iron by using BAg-5 filler metal alloy shows an Eutectic structure at the middle of filler zone, which lead to great affinity between nickel element with copper. The optimum shear strength of 43 MPa was achieved for the bond made by BAg-7 filler metal.
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