Triboelectric behaviors of materials under high speeds and large currents

Abstract

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.

Electro-tribological properties of diamond like carbon coatings

“…Electro-tribological behavior of the different variations of DLC coatings were carried out, including different humidity conditions. Unlike in electrically conductive counterparts, the electrical current was not a key parameter in these studies [4,43], because all studied DLC coatings were dielectric. The evolution of the electrical contact resistance and the coefficient of friction in the tests, typically presented a number of distinct phases.…”

“…Monitoring of the coating status and evolution can provide a valuable tool regarding the dependability of coatings/systems in critical applications and/or difficult to access locations [25−30]. Along these lines, monitoring of the dielectric coating degradation in sliding conditions, due to wear or other coating degradation mechanisms, can be helpful in the framework of defining a predictive approach of a dependable coating operating life [4,31]. Actually, usage of DLC coatings with different electrical properties have already been studied in fatigue damage sensors [32], being crack formation and propagation one of the potential degradation mechanisms of dielectric DLC coatings.…”

Flexible Piezoelectric Acoustic Sensors and Machine Learning for Speech Processing

“…This type is self‐powered operation, like piezoelectric acoustic sensor, converting mechanical deformation into electrical potential. The electrostatic charges can be severely affected by humidity and temperature, due to the nature electrostatic phenomenon . As one of the piezoelectric type, the surface acoustic wave (SAW) sensors consist of two bulky piezoelectric materials based rigid transducers to respond to high frequency signals above MHz .…”

Capacity evaluation on Cu rolling tribological/electric contact pairs under various contact load and applied voltage

“…Zhang et al. 's 1 results showed that the mechanism of material damage could transform from arcing erosion to mechanical wear with the increasing of contact load, and the wear rate was the lowest at the turning point. Especially, arcing erosion would become the dominant damage mechanism under large current and high speed.…”