The invention relates to an
indium and
silicon-contained
cadmium-free silver
filler metal, which belongs to the field of medium-temperature
brazing materials. The
cadmium-free silver
filler metal consists of chemical components accounting by weight percentage: 36 percent to 40 percent of
copper, 25 percent to 35 percent of
zinc, 0.5 percent to 4.5 percent of
indium, 0.01 percent to 0.5 percent of
silicon and 0.001 percent to 0.1 percent of microalloy elements and the allowance is silver; wherein, the microalloy elements are one or more of the alloying elements such as Ni, Mn, Sb, Zr, B, Ce, La, etc. The components are smelted and cast by adopting a conventional medium-frequency
induction furnace, and then the required
filler metal can be obtained by extruding, drawing, forming and washing the processed components. The temperature at which the
indium and
silicon-contained
cadmium-free silver filler
metal of the invention is melted ranges from 640 to 760 DEG C. By removing the hazardous element-cadmium, the
alloy filler
metal completely meets the requirement of the RoHS directive by European Union, removes the
hazard caused to the health of the bodies of the operation employees and contaminations caused to the environment. By matching the FB102 flux and the silver filler
metal of the invention for use, the invention can be applied to the
brazing between the
copper and workpieces such as
copper alloy, hard
alloy, stainless steel fitting, etc., and has the advantages of favorable wettability and fluidity, high
mechanical strength of the brazed joint, good
brazing process performance, etc. The
mechanical property of the weld is equal to that of the silver filler metals such as BAg40CuZnCd, BAG45CuZnCd, BAG45CuZn, etc. The silver filler metal of the invention can be widely applied to the brazing in the industries such as
refrigeration, machinery,
electric machinery, electric apparatuses, instruments and meters, valves and
pipe fittings, etc.