Study on discharging performance of doping nanocomposite Ag-SnO_2 contacts at low temperature sintering

The Fe-doped nanocomposite Ag-SnO2 contact alloys were prepared by chemical co-precipitation method,high-energy ball milling,hot pressing and sintering technique.The density,hardness,resistivity,brakdown strength and electrical arc erosion of alloys were measured,and the microstructures of the nanocomposite contact alloys were analyzed by field emission scanning electron microscopy(FESEM).Results show that the nanosized of SnO2 particles were refined doped with Fe,when Fe concentration increases,the size of oxide particles in nanocomposite Ag-SnO2 contact decreases further,and the microstructures of alloys are more homogenous and fine.Meanwhile the hardness,resistivity,average filed strength and arcing life of nanocomposite Ag-SnO2 contact increase,but its the current chopping value decrease.While the Fe-doping concentration has obviously influence on the arc ablation rate of nanocomposite electrical contact alloys.