Triboelectric behaviors of materials under high speeds and large currents

Using special testers,the triboelectric behaviors of several materials were investigated in this paper under the conditions of high speeds and large currents.The obtained results revealed that the tribological behaviors and current-conducting characteristics have complicated interrelationships.Worsening in the servicing conditions can obviously deteriorate the tribological as well as electrical behaviors;high sliding speeds and large electrical currents can worsen the tribological and electrical conductivity properties,while an appropriate contact pressure can benefit the electrical contact properties.Further analyses reveal that the worsening effects of the above factors,such as frictional heat,arc discharge,arc heat,and surface morphology,result in poor triboelectric contact performance.Among these,the electric arc is one of the most serious factors,because the occurrence of an electric arc may cause severe oxidation,melting,and roughening of the contact surface,thereby causing deterioration in the current-conducting quality as well as material loss.

Research progress on the characteristics of current-carrying tribology in electrical transmission

The electrical transmission between moving parts requires contact pairs such as rolling rings,sliding rings,connectors,etc.These functional contact pairs can be defined as current-carrying frictional pairs because they need to bear the transmission of current while enduring friction and wear.The rough current-carrying frictional pairs are typical contact surface withstands the load of force,heat,and electricity,resulting in the unique contact characteristics of the current-carrying pair.The research progress of current-carrying tribology has been reviewed in this paper.The correlation mechanism between tribological performance and current-carrying performance has been summarized.The composite and competitive relationship between mechanical damage and electrical damage has been discussed.Methods for evaluating the dynamic performance of current-carrying tribology has been proposed.The spatiotemporal non-uniformity of current-carrying frictional damage has been revealed.Future research trends are expected at the end.