Brazing Characteristics of Sintered Fe-Cu-C Alloy

Brazed characteristics of sintered Fe-Cu-C alloy are investigated focusing on the effect of pores in the sintered metals on the wettability and spreading behavior of filler metals, as well as a penetration of filler metals into a brazing gap to form brazed microstructure. Experiments are conducted using Ag-based alloys filler metals with different wettability. The wetting behaviors of the fillers on the surface of the sintered metals was examined. The result showed that the spreading area decreased with the increase of porosity of the sintered metal due to infiltration of the molten filler into the pore. The penetration of brazing filler into a gap was dependent on behaviors of spreading on the brazing interface and infiltration into microstructure. The relation between the spreading and infiltration is discussed based on the capillary action of molten filler and the effect of alloy elements in the filler metals on the interfacial reaction.