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The failure characteristics of the contact material Ag-SnO 2 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS). Phase analysis showed that there were Ag, SnO 2 , and Sn on the contact surfaces at the time of failure under the load condition of 30 A and 220 V (AC), which means that SnO 2 decomposed...
A composite contact materials Ag-SnO2 have been used in low current switching devices for its good anti-welding properties and resistance to arc erosion. But the mass material transfer occurred at large surge current in DC switching now and then. Mass material transfer have an increased probability of early failures because the effective contact gap reduces or two contacts lock together. In this research,...
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