Evaluation of Resistance at Supporting Pulley of Messenger Wire and Its Influence on Current Collection Characteristics

Amari, Satoru; Tsunemoto, Mizuki; Kusumi, Shunichi; Kuraoka, Takuya; Hamada, Takahiro; Minamoto, Michihito

doi:10.2219/rtriqr.50.137

Cited by 2 publications

(1 citation statement)

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“…Therefore, the main requirement for the technology for restoring local wear is that the contact wire does not reduce strength, and that the layers of the contact wire adjacent to the spraying area do not recrystallize. Due to the local wear with a length of up to 0.5 m, a contact wire that is 1.5 km long is replaced with a new contact wire, especially on high-speed railways [1][2][3][4][5][6][7]. To repair the local wear of contact wires, it is necessary to apply a layer with a thickness of approximately 2 mm and a width of approximately 10 mm on the strained Cu contact wire at a length of approximately 500 mm.…”

Section: Introductionmentioning

confidence: 99%

The Problem of Copper Softening During Cold Gas Dynamic Spraying

Гершман

Миронов

et al. 2019

Coatings

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The effect of the gas-dynamic (cold) spraying of the Cu-Al2O3-Zn powder mixture on the microstructure and strength of the copper substrate is investigated. A copper cold drawn contact wire was used as a substrate. We propose using gas-dynamic cold spraying to restore the local wear of the contact wire. The study of the microstructure using the electron backscattered diffraction (EBSD) method showed the presence of grain orientation characteristics of the cold drawing of copper. Recrystallization of the surface layers of the contact wire during spraying does not occur. Using the microhardness measurement, the absence of softening of the layers of the contact wire with a depth of up to 2 mm is shown. The results of mechanical tests show that spraying does not lead to a decrease in the tensile strength of the contact wire. The results of creep tests show that spraying does not lead to a decrease in the heat resistance of the contact wire.

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Section: Introductionmentioning

confidence: 99%