Enhancing the Electrical Performance of Agni Contact Material by Doping Ag2wo4

To improve the anti-welding ability of AgNi contact material, the Ag 2 WO 4 was doped for the Ag-8 wt%Ni contact material. The electrical contact tests were performed at 36 V/25A for 5000 operations on an electrical testing system, and the welding and material transfer behaviors were studied. The results show that doped Ag 2 WO 4 significantly decreases the welding frequency (115 times to 34 times) and welding force (max 0.49 N to 0.13 N) for the Ag-8 wt%Ni contact material, which is derived from the fine eroded morphology acted by Ag 2 WO 4 . Furthermore, doping Ag 2 WO 4 increases the material transfer from anode to cathode, which can be attributed to the influence of Ag 2 WO 4 on the plasma ion density, and the balance of metallic and gaseous arcs reflected from the arc power.