| H85 brass contact bridge and silver layer of AgSnO2/Ag contact were used as base materials, two silver alloy powders were used as brazing filler metals of brazing pastes. Mechanical properties, metallographic microscope, scanning electron microscope (SEM) and thermal analysis were used to study the influence of particle sizes, contents of Ag-20Cu-15Zn silver alloy powders and Ag-22Cu-17Zn-5Sn silver alloy powders on brazing rates. The results show that when Ag-20Cu-15Zn silver alloy powders’ particle sizes were between 45 to 75 μm, content was 60%, the brazing rate was the highest, which is 95.35%; the addition of Sn in the brazing filler metals reduces the melting temperature by 60℃, the fluidity of the silver brazing paste was enhanced during the brazing process, which was beneficial to increase brazing rate. |
