Abstract
The Ag/SnO2 electrical contact materials with different doping concentration of Zr and Fe were successfully fabricated through self-assembly precipitation and powder metallurgy method. The microstructures of Ag-SnO2 composite powders and the prepared Ag/SnO2 contact materials were investigated by a Scanning Electron Microscopy (SEM) coupled with EDS and EBSD systems. The results showed that the SnO2 nanoparticles with typical geometric shapes were formed and distributed in Ag matrix. The electrical conductivity of the Ag/SnO2 materials was significantly increased by 16 percent with the doping of 3 wt% ZrO2 in SnO2. The surface morphology of the Ag/SnO2 materials after arc erosion was further characterized. The formation of the Sn(Zr)O2 and Sn(Fe)O2 solid solution in Ag/SnO2 significantly improved the arc dispersion and arc erosion resistance. This work can offer a novel approach to design Ag/SnO2 contact materials for good electrical performances.
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