Sputter Erosion Model of Arcing Contact Materials(Arc Discharge & Related Phenomena,<Special Section>Recent Development of Electromechanical Devices (Selected Papers from ICEC2006))

概要

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The sputter erosion of arcing contacts is a very complex phenomenon, which is determined by the interaction between electromagnetic force, heat conduction and surface tension of liquid metal. A new model for evaluating the sputter erosion of electrodes is described in this paper, which is based on the electromagnetic forces against the molten pool, flowing velocity, kinetic energy and the surface tension of the molten pool. Erosion tests on AgSnO_2, AgNi_<10> and AgNi_<0.15> contacts under the loads of resistance, lamp and inductance respectively at 14 VDC have been carried out. Experimental results indicate good agreement with the model's simulation. The model shows how the current and density, specific heat and other parameters of material affect the erosion rate.
2007-07-01