In high speed railway operations, particular attention is given to the contact between the pantograph and catenary because the contact is essential to regular running of trains. With a fast development of high-speed electrified railways, high-speed running of trains will result in severe wear of the collector strips/ contact wires in pantograph-catenary systems, which can affect the service life of the collector strip/contact wire materials. In the present work, a large scale tester is developed and used to study the friction and wear behaviour of electric contact materials. A series of tests on the friction and wear behaviour of pure carbon strip/copper contact wire with alternating current were conducted on a ring-on-block sliding tester at a high speed. The electric current, normal force and sliding velocity have distinct effects on the test results. The worn scar has the smallest size without electric current. The worn scar becomes larger with increasing electric current. Arc ablation pits, dark stream-lines of arc ablation, slipping marks, spalling blocks and the copper-like layer are found on the worn surfaces. Arc erosion, abrasive wear and adhesive wear are main wear mechanisms. The following major conclusions can be concluded from previous test results: (1) The friction coefficient of the carbon strip rubbing against copper contact wire varies from 0.24 to 0.35 under the passage of alternating current of 0 A to 240 A at speeds of 140 km/h to 170 km/h. The friction coefficient without electric current is significantly higher than that with electric current. The friction coefficient decreases with the increase in electric current and normal force, but it increases slightly with increase in sliding velocity. (2) The wear rate of the carbon strip changes between 0.001 g/km and 0.014 g/km at a sliding distance of 150 km. The wear rate of the carbon strip is the lowest without electric current. As the electric current increases, the wear rate of the pure carbon strip significantly increases. When the electric current is equal to 240 A, the wear rate is about 10 times more than that without electric current. (3) Arc erosion, abrasive wear and adhesive wear are the main wear mechanisms accompanied by material transfer. And the dark stream-lines occur in the process of carbon strip rubbing against copper contact wire.


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    Titel :

    Friction and wear behavior of pure carbon strip sliding against copper contact wire under AC passage at high speeds


    Beteiligte:
    Ding, T. (Autor:in) / Chen, G.X. (Autor:in) / Wang, X. (Autor:in) / Zhu, M.H. (Autor:in) / Zhang, W.H. (Autor:in) / Zhou, W.X. (Autor:in)

    Erschienen in:

    Tribology International ; 44 , 4 ; 437-443


    Erscheinungsdatum :

    2011


    Format / Umfang :

    7 Seiten, 9 Bilder, 22 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch