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Arc Discharges of a Pure Carbon Strip Affected by Dynamic Contact Force during Current-Carrying Sliding

1
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(5), 796; https://doi.org/10.3390/ma11050796
Received: 30 March 2018 / Revised: 20 April 2018 / Accepted: 7 May 2018 / Published: 15 May 2018
(This article belongs to the Section Carbon Materials)
Arc discharges of a pure carbon strip induced by dynamic contact force were studied on a pin-on-disk tribometer. It was found that arc discharges were produced periodically in accordance with the period of the dynamic contact force. The arcing rate of the pure carbon strip increased with an increase of frequency f and amplitude B, which led to a decrease of current-carrying quality. These influences at high velocities became much more significant. A critical point of the arcing rate at around 2% was detected. Lower than 2%, the pure carbon strip was able to maintain its excellent current-carrying capability; higher than this point, the current-carrying quality deteriorated abruptly. SEM and XPS analysis show that the element Cu detected on the worn surface at lower arcing rates was metal Cu. CuO was found at higher arcing rates. This indicated that the wear mechanism transferred from mechanical wear to arc erosion with the increase of the arcing rate. View Full-Text
Keywords: arc discharge; current carrying; pure carbon strip; dynamic contact force arc discharge; current carrying; pure carbon strip; dynamic contact force
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Zhang, Y.; Zhang, Y.; Song, C. Arc Discharges of a Pure Carbon Strip Affected by Dynamic Contact Force during Current-Carrying Sliding. Materials 2018, 11, 796.

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