Pin-on-disc tribotests with the addition of Cu particles as an interfacial media: Characterization of disc tribosurfaces using SEM-FIB techniques

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

doi:10.1016/j.triboint.2016.03.034

Cited by 19 publications

(18 citation statements)

References 26 publications

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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: 62%

“…Furthermore, the addition of copper powder to the pin-on-disc test was able to form a transfer layer with the presence of oxygen, as showed by EDS, suggesting that there was the formation of oxide third body. EDS mapping was able to find the presence of copper on pin surfaces of the systems with copper particulate addition with particle size of 20 µm (see figure 3) and 50 nm [61,62] . XEDS mapping for Cu inhomogeneous, showing a higher Cu content on the lower right corner of the figure [62] .…”

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 98%

“…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%

“…FIB characterization showed debris on the surfaces formed compact and continuous oxide layer observed only for the systems with copper particulate addition with granulometry of 400 µm (figures 4 and 5), and on the condition with no interfacial media addition, 10 N of applied normal load. For the systems with copper particulate addition with granulometry of 20 µm and 50 nm, debris on the tribosurface were able to go through oxidation and some degree of sintering, but they were not able to form a compact film for 10 N of applied normal load [61,62] . Additionally, the pin microstructure shows the presence of a plastically deformed region (~ 3 µm) near the tribosurface [61] .…”

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 99%

“…under the Pt deposition. Arrow 1 points to the presence of wear debris at the asperity valley, whereas arrow 2 points to a thin grey continuous compact oxide layer at the asperity peak [62] Table 5 Average friction coefficient values for the binary graphite-Fe3O4 conditions. 36 Table 6 Results summary for the graphite-Fe3O4 conditions ..................................... 43 Table 7 Average friction coefficient values for the binary Cu-Fe3O4 conditions.…”

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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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Section: Kato's Tribotestsmentioning

confidence: 62%

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 98%

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 99%

Section: Tribofilm Microstructural Characterizationmentioning

confidence: 99%

mentioning

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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The Influence of Adding Copper and Iron Third Body on Brake Disc Temperature

Yao

Zhao

et al. 2023

Tribol Lett

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A large number of third bodies are born on the friction surface during braking. Exploring whether the third body has an impact on the friction surface temperature is helpful to recognize the wear factors affecting the brake disc. The effect of the third body composition on the temperature distribution of disc was studied by adding third body method on the TM-I inertial reduced scale brake testing machine, t Temperature distribution of the disc surface is compared at the pressure of 0.25 MPa and speed of 20-200 km/h under three conditions: no adding third body (NTB), adding Cu third body (CTB), and adding Fe third body (FTB). The results indicate that the difference in uidity and thermal conductivity between CTB and FTB leads to the deviation of the contact state of surface, thus forming the variation of temperature and distribution state of brake disc. At a speed of 120-200 km/h, when adding the CTB, the maximum temperature of disc surface is reduced by 1.9-3.1%, the proportion of the high-temperature zone is reduced by 4.3-13.1%, and the unit width temperature of the high-temperature area decreases 2.2-3.2%.When adding the FTB, the maximum temperature of the disc surface rises by 4.1-7.4%, meanwhile, the proportion of the high-temperature area and the temperature per unit width are increased by 1.4-5.4% and 5.9-20.2%, respectively. At high speeds, the good uidity and thermal conductivity of CTB lead to adhesive wear. FTB has high hardness, poor uidity and thermal conductivity, which causes oxidative fatigue wear.

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Assessment of wear micromechanisms on a laser textured cemented carbide tool during abrasive-like machining by FIB/FESEM

2020

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The combined use of focused ion beam (FIB) milling and field-emission scanning electron microscopy inspection (FESEM) is a unique and successful approach for assessment of near-surface phenomena at specific and selected locations. In this study, a FIB/FESEM dual-beam platform was implemented to docment and analyze the wear micromechanisms on a laser-surface textured (LST) hardmetal (HM) tool. In particular, changes in surface and microstructural integrity of the laser-sculptured pyramids (effective cutting microfeatures) were characterized after testing the LST-HM tool against a steel workpiece in a workbench designed to simulate an external honing process. It was demonstrated that: (1) laser-surface texturing does not degrade the intrinsic surface integrity and tool effectiveness of HM pyramids; and (2) there exists a correlation between the wear and loading of shaped pyramids at the local level. Hence, the enhanced performance of the laser-textured tool should consider the pyramid geometry aspects rather than the microstructure assemblage of the HM grade used, at least for attempted abrasive applications.

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Pin-on-disc tribotests with the addition of Cu particles as an interfacial media: Characterization of disc tribosurfaces using SEM-FIB techniques

Cited by 19 publications

References 26 publications

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

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

The Influence of Adding Copper and Iron Third Body on Brake Disc Temperature

Assessment of wear micromechanisms on a laser textured cemented carbide tool during abrasive-like machining by FIB/FESEM

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