Current-carrying tribological behavior of C/Cu contact pairs in extreme temperature and humidity environments for railway catenary systems

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外文摘要：Many current-carrying contact pairs,such as those found in pantograph-catenary systems,operate in open environments and are susceptible to significant external interference from temperature and humidity variations.This study investigated the evolution of the friction coefficient and contact resistance of C/Cu contact pairs under alternating temperature,humidity,and current conditions.Through experimentation,the wear rate and microtopography of the worn surface were analyzed under various constant parameters.Subsequently,the differences in tribological behavior and current-carrying characteristics of the contact pairs under these three parameters were explored.The results revealed that the decrease in temperature resulted in a significant increase in the friction coefficient of the contact pairs,carbon wear,and copper surface roughness.Additionally,the surface oxidation rate was lower at lower temperatures.Moreover,contact resistance did not consistently increase with decreasing temperature,owing to the combined action of the contact area and the oxide film.Compared with temperature,humidity fluctuations at room temperature exerted less influence on the friction coefficient and contact resistance of the contact pairs.Dry environments rendered carbon materials vulnerable to oxidation and cracking,while excessive humidity fostered abrasive wear and arcing.High-current conditions generally degraded the tribological properties of C/Cu contacts.In the absence of current,the friction coefficient was extremely high,and the copper transfer was high.Under excessive current,copper was susceptible to plowing by carbon micro-bumps and abrasive particles,resulting in a decrease in the friction coefficient.The release of lipids from the carbon surface due to temperature elevation weakened the electrical contact performance and increased the occurrence of arc erosion,thereby exacerbating carbon wear.

外文关键词：

temperature/humiditypantograph-catenary systemC/Cuwearcurrent-carrying frictionsliding electrical contact

作者：

SHEN MingXue、JI DeHui、HU Qiang、XIAO Li、LI QiuPing

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作者单位：

State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China

School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China

Institute of Applied Physics,Jiangxi Academy of Sciences,Nanchang 330095,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangxi ProvincePostgraduate Innovation Special Fund Project in Jiangxi ProvinceGeneral Subject of State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure

项目编号：

523650225237518120224ACB204012YC2022-B177HJGZ2023208

出版年：

2024

DOI：

10.1007/s11431-024-2688-7

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.67(8)

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