Influence of metal impurities on erosis and wearing of composite contacts
DOI:
https://doi.org/10.31548/energiya2020.04.086Abstract
The questions of influence of contact material, switching modes and environment with various impurity on electroerosion resistance of contact details of switching devices are considered. Substantiated possibilities and measures to increase the reliability and efficiency of relays in electrical installations through agriculture through the use of erosion-resistant contact materials based on the study of physical and mechanical properties of the components of the composite contact material in switching current; substantiated composition of ingredients in the new composite material for contact parts of switching devices. The results of researches of electro erosive stability of composite material depending on structure of ingredients and their physical and mechanical properties are resulted. It has been experimentally established and theoretically confirmed that electric erosion is mainly determined by the microstructure of the material and the change in the physical and mechanical properties of the ingredients on the working surface of the contact parts during current switching. Factors providing increased arc resistance due to thermoemission properties of contact compositions that control the processes of diffusion, migration and phase transformations in chemical reactions are obtained, and the theory of the mechanism of arc reference points movement on the working surface of electrical contacts is substantiated.
Key words: electro erosion resistance, contact wear, contacts surface microstructure, cathode, anode, mass transfer
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