Study on Current-Carrying Tribological Characteristics of C-Cu Sliding Electric Contacts under Different Water Content
Source abstract
Abstract
Previous studies have often observed that moisture can promote the lubricity and wear resistance of carbon-metal contact pairs in purely mechanical conditions. However, the damage to pantograph carbon strips was found to be aggravated in rainfall conditions, leading to a much lower service life than anticipated. This suggests a novel influence mechanism of water on carbon-copper (C-Cu) contacts during current-carrying friction. In this paper, the influence mechanism of water on the current-carrying friction characteristics of carbon-copper contacts, including friction coefficient, wear loss, electrical contact resistance, and arc discharge characteristics, was studied under different current levels by controlling the water content of carbon sliders. The results show that the variation trend of current-carrying tribological parameters of C-Cu contacts with water content at 60–100 A is significantly different from that at 20–40 A, which is mainly the result of the competition of lubrication, cooling, and obstruction of current transmission by moisture. The abnormal wear of carbon sliders in the water environment occurs when the current is greater than 60 A, and the main reason for the abnormal wear is the intensification of discharge erosion. In addition, micro-crack propagation under high water content is an important factor in the deterioration of carbon strip properties.
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Research context
OpenAlex topics: Electrical Contact Performance and Analysis · Mechanical stress and fatigue analysis · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611730, China
Funding
National Natural Science Foundation of China · Smart Grid Joint Fund and the National Natural Science Foundation of China · Technology Project of Headquarter of SGCC
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