Oxidation on the current-carrying rolling surface and its subsequent impact on the damage of Cu contact pairs in O2/N2 mixture

•O2 participates in the oxidation of Cu during current-carrying rolling.•The hydrophilicity of oxides leads to high COF.•EBSD reveals high COF-induced deformation beneath wear surface. The oxidation of copper surface under current-carrying conditions were investigated by using a disc-disc rolling tr...

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Bibliographic Details
Published in:Materials letters 2021-04, Vol.288, p.129349, Article 129349
Main Authors: Sun, Yixiang, Song, Chenfei, Zhang, Yanyan, Li, Mengjia, Zhang, Yongzhen
Format: Article
Language:English
Subjects:
Adhesive wear
Coefficient of friction
Contact
Contact angle
Copper
Current-carrying tribology
Deformation wear
Fatigue
Fatigue wear
Friction
Impact damage
Materials science
Oxidation
Oxygen
Oxygen content
Shear deformation
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Summary:•O2 participates in the oxidation of Cu during current-carrying rolling.•The hydrophilicity of oxides leads to high COF.•EBSD reveals high COF-induced deformation beneath wear surface. The oxidation of copper surface under current-carrying conditions were investigated by using a disc-disc rolling tribometer in different oxygen contents. Energy-dispersive X-ray spectrometry on rolling surface showed that the increase of oxygen content promoted surface oxidation. An interesting phenomenon was that the friction coefficient increased with the oxygen content. Contact angle tests indicated that the surface with a higher oxidation degree had a better hydrophilicity, which would cause a higher friction coefficient because of the additional meniscus force. Meanwhile, material damage styles changed from adhesive wear to lamellar fatigue wear due to the shear deformation induced by high friction coefficient, which has been demonstrated by electron back-scattered diffraction observation.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.129349