Effect of Cu particles as an interfacial media addition on the friction coefficient and interface microstructure during (steel/steel) pin on disc tribotest

Rodrigues, A.C.P.; Yonamine, T.; Albertin, Eduardo; Sinatora, Amilton; Azevedo, César Roberto de Farias

doi:10.1016/j.wear.2015.02.006

Cited by 31 publications

(24 citation statements)

References 24 publications

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“…Figure , in order to determine the composition of Cu/PDA/O‐g‐C 3 N 4 , we discussed it by XPS analysis with Cu/PDA/O‐g‐C 3 N 4 . As shown in Figure a, the peaks of C1s, O1s, N1s and Cu2p (appear at 286.1 eV, 532.1 eV, 398.8 eV, 929.1 eV, respectively) can be clearly observed . In Figure b, the peak is 286.1ev sp2 hybridized C(N−C=N) .…”

Section: Resultsmentioning

confidence: 96%

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Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

Min

Jia

et al. 2020

ChemistrySelect

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The wet chemical reduction method was used to modify polydopamine (PDA) functionalized oxygenated carbon nitride (O‐g‐C3N4) nanosheets to prepare in situ growth of Cu nanoparticles (Cu NPs) decorated on nanosheets. The PDA attached to the surface of O‐g‐C3N4 provided a uniformly distributed platform for copper nanoparticles. It also provided rich functional groups and provided good conditions for the dispersion of Cu/PDA/O‐g‐C3N4 in pure oil. Through TEM testing, Cu NPs with a diameter of 5–10 nm were evenly distributed on the PDA/O‐g‐C3N4 nanosheets. Through the sliding test on the steel surface, it was obvious that adding 0.2 wt % Cu/PDA/O‐g‐C3N4 to pure oil had a lowest coefficient of friction. In addition, the wear marks on the surface of Cu/PDA/O‐g‐C3N4 steel discs were studied with an optical microscope and a three‐dimensional profiler and its wear resistance was better than Cu NPs, O‐g‐C3N4 and Cu/O‐g‐C3N4.

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Section: Resultsmentioning

confidence: 96%

“…As a soft metal, copper nanoparticles have excellent ductility, electrical conductivity, and corrosion resistance. As a lubricating additive, it has attracted widespread attention due to its low shear strength, low friction, and low price during grain boundary sliding . Tarasov et al.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

Min

Jia

et al. 2020

ChemistrySelect

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“…The modelling results on the effect of graphite mixed with Fe3O4 on the CoF have been experimentally confirmed, but the role of "soft" copper on the CoF was yet to be confirmed [60] . Previous investigations from this author indicated pure Cu addition actually increased the CoF during pin-on-disc testing at room temperature [61,62] .…”

Section: Kato's Tribotestsmentioning

confidence: 63%

“…Focused ion beam (FIB) and transmission electron microscopy (TEM) characterization were able to show a plastically deformed layer below the tribofilm at the disc surfaces [61,62,70,78,82] . Österle et al (2014) explained low friction cases by the protection of the steel first bodies by a third body film, the destruction of this film, however, would lead to higher friction and severe plastic deformation of the steel substrate [83] .…”

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 99%

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Effect of nanoparticulate copper, zirconia and graphite: contribution to the friction coefficient and transfer layer formation in dry sliding tests with interfacial media addition.

Rodrigues¹

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Copper is present in brake pads in the form of fibres, tough its suppression from pads' formulations is already a trend compared to the suppression of asbestos in the 1980's.As a contribution to this challenging scenario, this work investigated the behaviour of mixture additions containing copper, zirconia, graphite and magnetite in dry sliding tribotests. Pin-on-disc tribotests with interfacial media addition were performed in order to contribute on the mission of understanding how Cu, graphite and ZrO2 particles act on the oxide transfer layer formation on dry sliding conditions. Thus describing some of the tribological properties that a possible replacement for copper in brake pads should mimic. Tests were performed at 23°C in air, 400°C in air and 400°C in N2.Nanoparticulate Cu, ZrO2 and micron-sized graphite were mixed in a Fe3O4 basedmatrix. The ZrO2 particles were incorporated to the mixtures by two mixing methods: manual mixing and high-energy ball milling. This study sought to explain the coefficient of friction (CoF) behaviour of these additions individually, as well as together, by correlating the CoF with comprehensive characterization of the oxide transfer layer. The transfer layer was characterized by means of scanning electron microscopy (SEM), Focused Ion Beam (FIB) and Transmission electron microscopy. Graphite containing mixtures displayed low average CoF values (0.23 to 0.31) due to selective transfer of graphite films to the first bodies' tribosurfaces. Copper formed agglomerates and patches within the oxide transfer layer that were responsible for raising the CoF values at 23°C and acted as soft copper films at 400°C. The nanoparticulate addition of ZrO2 in the manual mixtures prevented the formation of Cu patches and larger agglomerates, promoting the formation of a smooth and compact oxide tribolayer, though graphite's selective transfer was still observed.

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Tribological Behavior of Copper–Graphite Powder Third Body on Copper-Based Friction Materials

Gao

Han

et al. 2015

Tribol Lett

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Effect of Cu particles as an interfacial media addition on the friction coefficient and interface microstructure during (steel/steel) pin on disc tribotest

Cited by 31 publications

References 24 publications

Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

Effect of nanoparticulate copper, zirconia and graphite: contribution to the friction coefficient and transfer layer formation in dry sliding tests with interfacial media addition.

Tribological Behavior of Copper–Graphite Powder Third Body on Copper-Based Friction Materials

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