Effect of relative humidity on the current-carrying tribological properties of Cu–C sliding contact pairs

Wu, Ruixuan; Song, Chenfei; Wu, Haihong; Lv, Bin; Zhang, Yanyan

doi:10.1016/j.wear.2021.204219

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…The frictional and electrical properties are greatly affected by temperature due to the synchronous occurrence of friction and conduction at the current-carrying friction contact interface [14] and the strong interference of ambient temperature on the surface/interface characteristics. Ding et al [15] evaluated the electric sliding friction and wear behavior of carbon strips at different temperatures (room temperature − 300℃), and obtained that the wear amount of carbon strips increased slowly as the contact temperature increased.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Ji,

Xiao,

et al. 2024

Preprint

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The environmental temperature alters the frictional behaviour by changing the state of the current-carrying contact interface, which makes the electrical contact invalid. In this work, the effects of three different temperatures (-20 ℃, 0, 20 ℃) on the current-carrying tribological behaviour of C-Cu tribo-pairs in high humidity environment (85%) were discussed. The evolution laws of friction coefficient, wear volume, contact surface properties, and contact resistance of C-Cu contact pairs under the coupling effect of temperature and current were studied, and the current- carrying wear mechanism of C-Cu at low temperature was analyzed in depth. The friction coefficient at each temperature exhibits a similar changing rule before and after current-carrying, demonstrating that the friction coefficient increases as temperature falls. However, the average friction coefficient at each temperature is lower than that without current. Although it will hasten the material surface's oxidation, a drop in ambient temperature will effectively lessen the transfer behavior of copper to carbon surface and reduce the wear volume of carbon material. The amount of copper transferred increases as current rises. Compared with the current, the change of temperature has a greater impact on the damage of tribo-pairs. At room temperature, the contact resistance under high current is greater than that of low current, the low temperature is just the opposite. In addition, at 0℃, although the contact resistance of low current (5 A) decreases significantly in the early stage of friction, its average resistance and fluctuation amplitude are the largest. As the temperature decreases, the current-carrying wear mechanism of C-Cu contact pairs gradually changes from adhesive wear to fatigue wear.

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Section: Introductionmentioning

confidence: 99%

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Ji,

Xiao,

et al. 2024

Preprint

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“…Many studies have been conducted to investigate the problem of electrical contact wear. [1][2][3][4][5] Electrical contact wear is a complex process involving several physical changes and chemical reaction interaction including friction, temperature rises, mechanical wear, and oxidation. Azevedo et al 6 performed experimental research on the wear behaviors of electric contact friction and established the relationship between material loss and peeling of the hard phase produced by the oxidation of the friction pair surface.…”

Section: Introductionmentioning

confidence: 99%

Simulation of electrical contact wear on the rough surfaces of ultra-high-voltage transmission line fittings

Yang,

Li,

Wang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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A novel electrical contact wear simulation method was proposed to characterize the electrical contact wear of fittings in ultra-high-voltage transmission lines by combining line fittings with the Archard wear model and oxidation loss theory. In this method, a three-dimensional (3D) rough body was generated by using the Weierstrass–Mandelbrot fractal function to simulate the contact surface. An electrical contact wear subroutine was developed, and the wear state was updated using arbitrary Lagrangian–Eulerian adaptive grid technology. Finally, finite element software was used to perform thermal stress wear coupled analysis. The results show that the wear volume, wear depth and friction temperature obtained by the rough electric contact model were 2.71 times, 4.21 times and 2.18 times of the common ideal plane model, respectively. In the rough model, the wear depth of the nodes initially accelerated, subsequently slowed down, and again accelerated with time. The friction high temperature region was distributed in a point pattern, and the temperature difference between the contact region and the non-contact region became obvious.

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“…In a large number of studies on friction and wear properties of carbon-graphite materials, it has been found that moisture is a key influencing factor [14][15][16][17][18][19][20][21]. As early as 1978, Lee and Johnson found that metal-graphite brushes had a lower friction coefficient and wear loss in humid environments [14].…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al studied the current-carrying friction of C-Cu contacts and found that the wear of the carbon slider increased with humidity. They believed that the main reason was that water passivation made the carbon layer slip more easily [21].…”

Section: Introductionmentioning

confidence: 99%

“…After all, in the presence of water film, the transmission of current at the C-Cu interface is different from that in the dry condition, and the change in electrical damage of the C-Cu contacts is not clear. Although the reference [21] also studied the influence of humidity on the current-carrying wear of C-Cu contacts, it was found that the wear of the carbon slider was aggravated under humidity. However, the current level in the test is only 2 A, which is far from the actual current level (hundreds A) of the pantograph-contact line systems, and it is difficult to fully explain the causes of abnormal wear of the carbon slider.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Current-Carrying Tribological Characteristics of C-Cu Sliding Electric Contacts under Different Water Content

et al. 2022

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Previous studies have often observed that moisture can promote the lubricity and wear resistance of carbon-metal contact pairs in purely mechanical conditions. However, the damage to pantograph carbon strips was found to be aggravated in rainfall conditions, leading to a much lower service life than anticipated. This suggests a novel influence mechanism of water on carbon-copper (C-Cu) contacts during current-carrying friction. In this paper, the influence mechanism of water on the current-carrying friction characteristics of carbon-copper contacts, including friction coefficient, wear loss, electrical contact resistance, and arc discharge characteristics, was studied under different current levels by controlling the water content of carbon sliders. The results show that the variation trend of current-carrying tribological parameters of C-Cu contacts with water content at 60–100 A is significantly different from that at 20–40 A, which is mainly the result of the competition of lubrication, cooling, and obstruction of current transmission by moisture. The abnormal wear of carbon sliders in the water environment occurs when the current is greater than 60 A, and the main reason for the abnormal wear is the intensification of discharge erosion. In addition, micro-crack propagation under high water content is an important factor in the deterioration of carbon strip properties.

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Effect of relative humidity on the current-carrying tribological properties of Cu–C sliding contact pairs

Cited by 17 publications

References 27 publications

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Simulation of electrical contact wear on the rough surfaces of ultra-high-voltage transmission line fittings

Study on Current-Carrying Tribological Characteristics of C-Cu Sliding Electric Contacts under Different Water Content

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