Three different copper alloys have been studied, a Cu-ETP, a copper-silver alloy, Cu-AgO,l, and a copper-magnesium alloy, Cu-MgO,5. The materials were received in form of contact wire for railway applications with sections that ranged from 107 to 150 mm(exp2). The chemical compositions of the samples were determined by optical emission spectrophotometry and the oxyigen contents of the three samples were calculated by methods of quantitative metallography. In order to obtain a more detailed characterization of these materials, their mechanical and electrical properties were measured (tensile strength, the elongation at break and electrical conductivity). Microhardness, MH, was determined at room temperature (211 deg C) by using a Shimadzu model M microhardness tester that was equiped with a Vickers indenter. A contact time of 15 s and a 500 N load were employed. The reported values were obtained by averaging the results of six indentations and the intervals of confidence (95 % confidence level) for these measures were lower than 2 % of the mean values. The wear experiments were carried out by using a Microtest pin-on-disc high temperature tribometer that was provided with a 4 mm diameter hardened steel ball 52100. The hardness value for the ball was 60 HRC. The test were done over transversal sections of the wires that were previously polished for obtaining an average roughness (Ra) lower than 0.25 micrometer. A normal contact load of 5 N was applied on the surface of the specimens. A sliding speed of 0,075 m/s was selected for all the experiments and the test duration was 50 min and, consequently, the wear path that corresponds to these settings is 225 m. The samples were tested at different temperatures ranging from 20 to 350 deg C. The magnitude of the wear was determined by the difference between the weight of the samples before and after the test. The reported values are the average of several measurements and standard deviations range from 20 to 30 % of the average.


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    Title :

    Study of the abrasive wear behaviour of electrified railway wires


    Additional title:

    Studie über das Abrasivverschleißverhalten von elektrischen Eisenbahnfahrdrahts


    Contributors:
    Garcia, A. (author) / Lorenzo, V. (author) / Varela, A. (author) / Camba, C. (author) / Blazquez, V. (author)


    Publication date :

    2009


    Size :

    5 Seiten, 3 Bilder, 2 Tabellen, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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