Abstract
AbstractThe paper describes a theoretical model of erosion processes in electrode spots during vacuum discharge. The proposed model considers the sources and drains of heat in the electrode spots. Temperature fields near the spots and the rate of evaporation of the material during the life of the spot are determined. In turn, this made it possible to determine the erosion coefficient for the electrode spot. To verify the adequacy of the model, calculations were performed for copper electrodes. The dependence of the erosion coefficient on the lifetime of the spot and the current density at the electrodes is obtained. When the current density is more than 109 A/m2, the probability of material emission in the liquid state increases, preventing nanostructures’ appearance. For both the stationary and moving spots, the dependences of the erosion coefficient on the lifetime are obtained. The dependencies reveal a significant decrease in the erosion rate with increasing the velocity of the spots. The calculated values of the arc current density coincide in order with the experimental values. The model can be used to find the critical values of technological parameters in obtaining nanostructures for different electrode materials.KeywordsIndustrial innovationElectrodesVacuum arcElectrode spotsErosionNanostructures
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