Abstract
The article is devoted to extending the life of contact strips for collecting pantographs in electric traction vehicles by choosing the elemental composition of nanostructured crystals of partially stabilized zirconia for inserts. The effect of doping zirconia crystals with rare-earth elements on tribological properties is experimentally investigated. The hardness of the sample and crack resistance are evaluated by the method of kinetic micro-indentation. It has been established that alloying zirconia crystals is an effective method of increasing strength properties. Crystal samples were selected that showed the highest characteristics of crack resistance and hardness. Tribological tests of selected samples under dry sliding conditions were carried out on laboratory friction machines. The wear rate of surfaces for steady-state friction is directly proportional to the nominal pressure. The morphology and mechanism of wear of the friction surfaces after testing are investigated. The appearance of unevenly distributed films of secondary structures on the friction surface is shown. The use of zirconia inserts in contact strips will increase the wear resistance and allowable load on the prefabricated pantograph, which will reduce the potential of the arc discharge. A predicted elemental composition of zirconia-based material for a contact strip sleeve is proposed.
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