Electrical Contact Properties of AgSnO2NiO Electrical Contact Material

Abstract:

AgSnO₂NiO electrical contacts with different NiO contents were prepared by internal oxidation method. Electrical contact experiments were conducted on the JF04C contact material testing machine. The contact resistance, anti-weldability and material transfer properties of materials were studied. The sample surface morphology changes were analyzed by scanning electron microscopy (SEM). The results show that the addition of NiO is beneficial to reduce and stabilize the contact resistance. When the voltage is not higher than 18 V, the contact resistance gradually decreases with the increase of test times and finally tends to be stable. When the voltage reaches 25 V, the contact resistance of materials will increases, and the increased degree of the contact resistance is different. Both the welding power and the arcing energy of the material will increase with the voltage increases. The increase of the NiO content does not significantly reduce the melting, but it played a important role in reducing the arc energy. The electrical contact process is anodic transfer. The total mass loss of materials decreases with the increase of NiO contact. The surface of the cathode is obviously accompanied by a layer of solidified molten metal. The material transfer is mainly carried out by a fused-bridge mode with a convex peak. The surface exhibits a paste-like peak topography.