Structure of Contact Layer of Steel (0.2% С) and Electrical Conductivity of Contact in Sliding on Steel Under Alternative Electric Current with Different Turn Ratios of Current Source

Dry sliding electrical steel/steel contact with a current density above 100 A/cm 2 was implemented according to the pin-on-disk interface conjugation. Alternating current was applied into the contact using the transformer with different turn ratios k . It has been found that the contact exhibits quite satisfactory wear resistance and electrical conductivity in case of sliding with a higher turn ratio. The current supply to the contact from the power winding with a large number of turns (low k ) led to a decrease in the electrical conductivity of the contact and its rapid deterioration. The morphological feature of the sample sliding surface was shown, realized in the formation of two sectors with different topography. The sliding surface sector directed towards the movement of the counterbody (front sector) was deformed and deteriorated due to the mechanism of adhesion and plowing. The other sector was deformed by a viscous fluid mechanism. These morphological details of the sliding surface were visible after sliding at different turn ratios. X-ray phase analysis found the formation of FeO and FCC-iron in the surface layer of the sample.