Microstructure and strength of TiC cermet/cast iron brazed with Ag-Cu-Zn filler metal

摘要

The brazing of TiC cermet to cast iron was carried out at 1223 K for 5-30 min using Ag-Cu-Zn filler metal. The formation phases, interface structures and shear strengths of the joints were investigated. The experiment result and analysis identify that three new phases, namely Cu base solid solution, Ag base solid solution and (Fe, Ni) have formed during the brazing of TiC cermet to iron. The interface structure of the joints can be expressed as TiC cermet/Cu base solid solution/Ag base solid solution -H a little Cu base solid solution/Cu base solid solution + (Fe, Ni)/cast iron. The highest shear strength of the joints is 292.0 MPa, obtained with a brazing time of 20 min.