2026-10-12T21:23:26Z https://www.scidb.cn/oai

10.57760/sciencedb.Tribology.00075 2026-06-22T15:37:54Z

2026-06-22 Experimental Study on Surface Roughness Variation Laws and Current-Carrying Characteristics of Carbon Strips in High-Speed Train Pantograph-Catenary Systems doi:10.57760/sciencedb.tribology.00075 en As a crucial conductive component of the pantograph-catenary system, the surface physical characteristics of the carbon strip directly determine the current-carrying stability and service life of the friction pair. In this study, a ring-on-block high-speed current-carrying friction and wear tester was utilized to simulate a sliding speed of 300 km/h and an electrical current of 200 A. The primary objective was to thoroughly investigate the quantitative correlation between the surface roughness of the carbon strip and its corresponding wear mechanisms under varying normal loads ranging from 40 N to 140 N, as well as different testing durations. To achieve a comprehensive analysis, White Light Interferometry and Scanning Electron Microscopy were employed for multi-scale characterization of the morphological changes. The experimental results objectively indicate that as the normal load increases, the surface roughness of the carbon strip exhibits a non-monotonic trend, characterized by an initial decrease followed by a subsequent increase. Furthermore, a significant negative correlation is observed between the surface roughness and the current-carrying efficiency, whereas a positive correlation exists between the roughness and the wear rate. Under the low load range, specifically from 40 N to 60 N, the occurrence of frequent offline arcs facilitates the reverse transfer of contact wire material onto the surface of the carbon strip. Consequently, this process leads to the formation of high-hardness copper oxide nodular protrusions, which markedly deteriorates the contact condition. It is found that when the normal load is maintained at approximately 100 N, the arc ablation and mechanical wear reach a state of dynamic balance. Such a balance effectively suppresses the formation of both ablation pits and nodular protrusions. Ultimately, this research successfully identifies the critical state marking the transition of the surface morphology from arc-driven roughening to mechanical flattening. By pinpointing these specific parameters and their subsequent effects on the physical characteristics of the carbon strip, the findings offer substantial theoretical support for optimizing the current-carrying stability of high-speed pantographs in practical engineering applications. pantograph-catenary system; wear mechanism; surface roughness; nodular protrusions; current-carrying efficiency Yang Hongjuan Kou Qining Jiang Li Dengxing Bridge Gao Chang Chen Longting Wang Peishen PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank