Change in the electrical resistance of the metallic composite material-steel contact under friction and electric current |
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Authors: | V V Fadin and M I Aleutdinova |
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Institution: | 1.Institute of Strength Physics and Materials Science, Siberian Division,Russian Academy of Sciences,Tomsk,Russia |
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Abstract: | The I–V characteristics of the sliding contact of metallic composites of grade 45 steel without a lubricant are presented. Steel-based
composites are shown to increase the actual electric-contact area due to the appearance of electric discharges, which provide
the main passage of an electric current with a density up to 300 A/cm2. Copper-based composites cannot initiate electric-discharge conduction because of the fracture of the contact zone material
at a current density higher than 50 A/cm2. The electrical resistivity of the contact layer of metallic composites is calculated. It is found that, during friction
with a high current density, the electrical resistivity of the contact layer approaches the electrical resistivity of graphite.
It is experimentally shown that the actual electric-contact area can be increased by the introduction of a Pb-Sn melt into
the friction zone and reaching a current density higher than 300 A/cm2 in the contact. |
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