低气压对C/Cu接触副载流摩擦特性的影响研究OA

Electric railways operating in high-altitude areas face problems such as abnormal wear and reduced current-carrying efficiency.Moreover,the current-carrying tribological performance of the C/Cu contact pair in the pantograph-catenary system exhibits obvious air-pressure sensitivity and is highly susceptible to low-air-pressure environments.Therefore,investigating the influence of low air pressure on the current-carrying tribological performance of the contact pair is of great significance for ensuring the safe operation of high-speed trains.Current-carrying friction tests of the contact pair under different air pressures were conducted using a reciprocating current-carrying friction and wear test platform and a sealed atmosphere chamber.The results showed that as the air pressure decreased,the average contact resistance of the contact pair showed a decreasing trend,and the fluctuation increased significantly,resulting in reduced current-carrying stability.The friction coefficient and wear volume increased with decreasing air pressure,indicating that the low-air-pressure environment deteriorated the interfacial contact characteristics of the contact pair and caused a reduction in service life.Microanalysis of the interface morphology of the contact pair revealed that severe adhesive wear caused by the reduced self-lubrication of the carbon material under low air pressure,together with arc erosion,was the main reasons for these changes.