Microscopic investigation on current-carrying wear on surface of pantograph carbon slide surface of metro train
In order to explore the wear mechanism of pantograph carbon slide surface, taking the pantograph copper to impregnate carbon slide material before and after the wear of a domestic subway line as the object, the surface microstructure and chemical composition of the carbon slide were tested and analy...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2022-07-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2022.04.019 |
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| Summary: | In order to explore the wear mechanism of pantograph carbon slide surface, taking the pantograph copper to impregnate carbon slide material before and after the wear of a domestic subway line as the object, the surface microstructure and chemical composition of the carbon slide were tested and analyzed by electron microscope, laser confocal microscopy, scanning electron microscope and energy dispersive spectrometer. The results showed that the surface color of carbon slide changed obviously after wear, and the surface morphology changed from machining gully to wear scar, few cracks and arc ablation holes; the results of SEM and EDS showed that the distribution of C and Cu phases on the surface of unwearied pantograph carbon slide was relatively clear, while the distribution of C and Cu elements on the surface after wear was relatively uniform and there was no obvious boundary, indicating that the oxide film was formed during the wear process; arc ablation gathered in the relatively concentrated area of Cu distribution. The main wear forms of the surface were arc ablation, mechanical wear, abrasive wear and material transfer. Among them, arc ablation had the greatest impact on wear, inducing arc ablation pits, the material surface presents a typical rough and rugged morphology, and the friction condition deteriorated significantly, which aggravated the vibration of pantograph and catenary, further affected the friction surface, and led to the increase of temperature rise of contact pair and arc ablation. The resulting high temperature induced material transfer. Under the combined action of various wear forms, the surface cracks of the pantograph carbon slide plate continuously initiated and expanded, and finally, the surface material fell off, resulting in the surface wear of carbon slide plate. |
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| ISSN: | 1000-128X |