Effect of Trace Element Ce,Sb and Li on Wettability and Oxidation Resistance of Silver-based Brazing Filler Metal

Four kinds of brazing filler metals with different trace element content were prepared.The effects of trace element Ce,Sb and Li on the wettability and oxidation resistance were researched.The results show that: Sb alloying elements can reduce the wettability of brazing filler metal,make the wetting area of brazing filler metal reduced by 31.5%,but this element can significantly improve the oxidation resistance of brazing filler metal,the oxidation speed is 30% lower than base-brazing filler metal;Ce can not only improve the wettability of brazing filler metal,but also improve the oxidation resistance of brazing filler metal;Li can improve the wettability of brazing filler metal,it can be more easily oxidized than the matrix,the oxidation rate increases by 46%,so Ce is the best trace element in brazing filler metal.