Tribological and conductive behavior of Cu/Cu rolling current-carrying pairs in a water environment

Sun, Yixiang; Song, Chenfei; Liu, Zili; Li, Jiawei; Wang, Li; Sun, Chao; Zhang, Yongzhen

doi:10.1016/j.triboint.2019.106055

Cited by 27 publications

(16 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial current was set as 0, 1.0, and 1.5 A, which was the same as our previous work. 19) The tests under each working condition were repeated 5 times. Before and after each rolling experiment, the average temperature of the rolling surface was measured by an Infrared Thermometer (SMART SENSOR, AS-852B+).…”

Section: Experimental Approachmentioning

confidence: 99%

“…Therefore, the current could also promote the formation of pits and the surface oxidation. 14,19,28) Erosion pits and current pulse were the typical characteristics of the arc between the current-carrying contact pairs. 2931) Based on the surface characterization and the current-carrying behaviors, it was speculated that arc discharge should take place under some conditions of high speed and large current.…”

Section: Characterization Of the Rolling Surfacesmentioning

confidence: 99%

“…32) In addition, the current would induce electrochemical oxidation on Cu surface, which could further aggravate the surface oxidation. 19,33) The O:Cu atomic ratio on worn surface based on EDS was shown in Fig. 10.…”

Section: Characterization Of the Rolling Surfacesmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Rotation Speed on the Tribological and Conductive Behaviors of Rolling Current-Carrying Cu Pairs

Song

Zhang

et al. 2021

Mater. Trans.

Self Cite

View full text Add to dashboard Cite

The tribological and conductive performance of the rolling current-carrying pairs were studied at different rotation speeds based on the disc-disc Cu pairs. Whether the current was applied or not, the friction coefficient decreased with the increasing of rotation speed. The average contact resistance increased with the rotation speed and the applied current. The sharp fluctuation of the real-time current was proposed as the failure criterion for the rolling current-carrying pairs, and both the rotation speed and the current accelerated the failure process. Erosion pits and melting could be observed by SEM, and the surface oxidation could be detected by EDS on the failure surface. It was speculated that arc discharge appeared under high speed and large current conditions, which encouraged the transformation of damage mechanism from mechanical wear to arc erosion. These results may provide some useful suggestions on the failure mechanism and life tests of the electro-conductive rotary joints.

show abstract

Section: Experimental Approachmentioning

confidence: 99%

Section: Characterization Of the Rolling Surfacesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Rotation Speed on the Tribological and Conductive Behaviors of Rolling Current-Carrying Cu Pairs

Song

Zhang

et al. 2021

Mater. Trans.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It can well explain the observed phenomena of potential-controlled boundary lubrication for pure liquids and the triboelectrochemical reaction products in friction contact area. Most importantly, the model is expected to provide a theoretical basis for many other solid-liquid interface processes under the effects of electromechanical coupling, such as the scratching of the surface under electrochemical conditions (Wang and Li, 2005), the highly efficient electrochemical mechanical polishing (Joo and Liang, 2013;Li et al, 2013), the rolling current-carrying contact in wet environment (Sun et al, 2019;Sun et al, 2020), and so on.…”

Section: Introductionmentioning

confidence: 99%

A Chemical Potential Equation for Modeling Triboelectrochemical Reactions on Solid–Liquid Interfaces

2021

View full text Add to dashboard Cite

Triboelectrochemical reactions occur on solid–liquid interfaces in wide range of applications when an electric field strong enough and a frictional stress high enough are simultaneously imposed on the interfaces. A characteristic of triboelectrochemical reactions is that not only the thermal energy but also the electrical and mechanical energies can activate, assist, or mitigate the solid–liquid interface chemical reactions, the products of which affect electrical and tribological behavior of the interfaces inversely. In previous studies, we have found that the coupling of frictional and electric effects could physically change the migration, adsorption, and desorption behaviors of the polar molecules, ions, or charged particles included in aqueous or nonaqueous base lubricant toward or away from the interfaces and thus control the boundary lubrication. Recently, we have found that the friction coefficient and surface appearance of some kinds of metals could also be modulated to some extent even in pure water or pure base oils under external electric stimulations. We attribute these changes to the triboelectrochemical reactions occurred when a strong external electric field is imposed on. Based on the effective collision model of chemical reactions, a chemical potential equation, which includes both electrical and mechanical contributions, has been derived. The proposed chemical potential equation can be used to explain the observed triboelectrochemical phenomenon in experiments. Based on the model, a novel method for oxidation coloring of the selected areas in metal surfaces is proposed. Together with the physical adsorption and desorption model of lubricant additives, the triboelectrochemical reaction model can well explain the phenomena of potential-controlled boundary lubrication in different lubrication systems and also provides a theoretical basis for other solid–liquid interface processes under the effects of electromechanical coupling.

show abstract

“…However, the COF of nitride H-13 steel at the macroscale was found to be lower than that for the pristine H-13 steel, although the wear depth of nitride H-13 steel was higher than that of the pristine sample owing to increased material exfoliation. For semiconductors, Yu et al [9,10,[14][15][16] found that the surface hydrophilicity exhibited a critical effect on the nanotribological properties of Si(100): The interfacial water-film increased both the capillary force and friction force, as well as water-related tribo-chemical wear. However, the surface hydrophilicity hardly affected the macro-tribological performance of Si(100) because asperities can easily penetrate the interfacial water-film owing to the very high local contact-pressure due to the multiasperity contact [11].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of the tribological properties of phosphate glass at the nano- and macro-scales

et al. 2020

Friction

Self Cite

View full text Add to dashboard Cite

Processing (grinding, polishing) of phosphate laser (PL) glass involves material removal at two vastly different (spatial) scales. In this study, the nano- and macro-tribological properties of PL glass are investigated by rubbing the glass against a SiO2 counter-surface in both dry and humid conditions. The results indicate that the friction of the PL glass/SiO2 pair has opposing trends at the nano- and macro-scales. At the nanoscale, the friction coefficient (COF) in humid air is much higher than in dry air, which is attributed to the capillary effect of the absorbed water-film at the interface. At the macroscale, on the other hand, the COF in humid air is lower than in dry air, because the water-related mechanochemical wear makes the worn surface less susceptible to cracking. Material removal for PL glass is better facilitated by humid air than by dry air at both scales, because the stress-enhanced hydrolysis accelerates the material-removal process in glass. Moreover, the material-removal is more sensitive to contact pressure at the macroscale, because stronger mechanical-interaction occurs during material removal at the macroscale with the multi asperity contact mode. At the macroscale, the material removal is more sensitive to contact pressure in humid air compared to dry air. Because almost all mechanical energy is used to remove material in humid air, and most of the mechanical energy is used to produce cracks in PL glass in dry air. The results of this study can help optimize the multi-scale surface processing of optical glasses.

show abstract

Tribological and conductive behavior of Cu/Cu rolling current-carrying pairs in a water environment

Cited by 27 publications

References 27 publications

Effect of Rotation Speed on the Tribological and Conductive Behaviors of Rolling Current-Carrying Cu Pairs

Effect of Rotation Speed on the Tribological and Conductive Behaviors of Rolling Current-Carrying Cu Pairs

A Chemical Potential Equation for Modeling Triboelectrochemical Reactions on Solid–Liquid Interfaces

Quantitative analysis of the tribological properties of phosphate glass at the nano- and macro-scales

Contact Info

Product

Resources

About