Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

Aristizabal, Katherine; Tayrac, Alexandra; Katzensteiner, Andreas; Bachmaier, Andrea; Súarez, Sebastián

doi:10.3390/lubricants7090075

Cited by 5 publications

(6 citation statements)

References 36 publications

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“…4), the coefficient of friction was in the range of 0.3–0.65. The beneficial effect of carbon nanotubes could result from a twofold impact, namely, they may introduce rolling motion or they may be degraded and smeared on the worn surface [ 24 , 36 ]. The resulting tribofilm on the contact surface between the mating metallic surfaces prevented direct metal-to-metal contact and reduced the adhesion between the contact surfaces [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…Introducing them into lubricating oils reduces friction and wear of mating parts [ 33 , 34 ]. Due to their excellent physical properties, low density, high aspect ratio and tribological properties, carbon nanotubes are also used as reinforcement in composite materials [ 24 , 35 , 36 , 37 , 38 ]. The effect of single solid lubricant additions has been widely researched.…”

Section: Introductionmentioning

confidence: 99%

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Tribological Properties of Cu-MoS2-WS2-Ag-CNT Sintered Composite Materials

et al. 2022

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In this work, in order to produce Cu-MoS2-WS2-Ag-CNT self-lubricating materials, powder metallurgy was used. Several different compositions containing single solid lubricant MoS2, WS2, Ag and CNTs as well as multi-component lubricants in the copper matrix were prepared. Friction and wear tests were carried out using the pin-on-disc method at room temperature. Light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to characterize the wear mechanism of sintered materials. The tribofilm on the worn surfaces of sintered materials and counter-specimens was observed. The influence of single solid lubricants and the synergistic interaction of two, three or four solid lubricants on tribological properties of sintered composite materials were determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Cu-MoS2-WS2-Ag-CNT Sintered Composite Materials

et al. 2022

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“…Another possible reason could be surface irregularities, which increased the CoF until a lubricious layer was formed due to the presence of GNPs on the wear track. This phenomenon is usually witnessed in the case of monolithic metals or composites reinforced with a very minimal concentration of reinforcements [78,80,81]. In Ni-GNP composites, the wear trend indicates that as GNP content increases in these composites, the CoF decreases.…”

Section: Tribological Performancementioning

confidence: 90%

Tribological Behavior of Carbon-Based Nanomaterial-Reinforced Nickel Metal Matrix Composites

et al. 2021

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Carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) with exceptional mechanical, thermal, chemical, and electrical properties are enticing reinforcements for fabricating lightweight, high-strength, and wear-resistant metal matrix composites with superior mechanical and tribological performance. Nickel–carbon nanotube composite (Ni-CNT) and nickel–graphene nanoplatelet composite (Ni-GNP) were fabricated via mechanical milling followed by the spark plasma sintering (SPS) technique. The Ni-CNT/GNP composites with varying reinforcement concentrations (0.5, 2, and 5 wt%) were ball milled for twelve hours to explore the effect of reinforcement concentration and its dispersion in the nickel microstructure. The effect of varying CNT/GNP concentration on the microhardness and the tribological behavior was investigated and compared with SPS processed monolithic nickel. Ball-on-disc tribological tests were performed to determine the effect of different structural morphologies of CNTs and GNPs on the wear performance and coefficient of friction of these composites. Experimental results indicate considerable grain refinement and improvement in the microhardness of these composites after the addition of CNTs/GNPs in the nickel matrix. In addition, the CNTs and GNPs were effective in forming a lubricant layer, enhancing the wear resistance and lowering the coefficient of friction during the sliding wear test, in contrast to the pure nickel counterpart. Pure nickel demonstrated the highest CoF of ~0.9, Ni-0.5CNT and Ni-0.5GNP exhibited a CoF of ~0.8, whereas the lowest CoF of ~0.2 was observed for Ni-2CNT and Ni-5GNP composites. It was also observed that the uncertainty of wear resistance and CoF in both the CNT/GNP-reinforced composites increased when loaded with higher reinforcement concentrations. The wear surface was analyzed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis to elucidate the wear mechanism in these composites.

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“…To investigate the tribological behavior of the nickel matrix composites, microtribological testing was performed using a ball on disk tribometer under linear reciprocating motion. [ 50 ] In this study, nickel matrix composites with 0.5, 1, and 2 wt% of carbon nanotubes, HPT processed at room temperature, were investigated. The applied strain during HPT was high enough to ensure saturation of the nickel matrix grain size.…”

Section: Carbon Metal Compositesmentioning

confidence: 99%

Effect of Carbon in Severe Plastically Deformed Metals

2020

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In the last decades severe plastic deformation techniques have gained increasing interest as they allow the production of bulk nanostructured materials with superior mechanical and functional properties. However, because of mechanically induced grain boundary migration, the achievable grain size reduction is not indefinite but tends to stagnate once sufficient strain has been applied. Consequently, addition of solute elements or second phase particles offers the possibility to access the true nanocrystalline regime. Due to their low solubility and high mobility, interstitial elements are extremely effective at subduing boundary migration. Herein the effect of carbon on grain refinement and the resulting mechanical properties are summarized. As carbon may not only be added as graphite but could also be introduced in other forms or as allotropes such as nanotubes, nanodiamonds, or carbides, the respective advantages and problems associated with it are the center of discussion. Independent of the strategy used, strength levels hardly achievable with other alloying elements can be obtained. Moreover, as carbon does not have a negative effect on grain boundary cohesion, despite the enormous strength levels even ductility and toughness can be widely maintained.

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Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

Cited by 5 publications

References 36 publications

Tribological Properties of Cu-MoS2-WS2-Ag-CNT Sintered Composite Materials

Tribological Properties of Cu-MoS2-WS2-Ag-CNT Sintered Composite Materials

Tribological Behavior of Carbon-Based Nanomaterial-Reinforced Nickel Metal Matrix Composites

Effect of Carbon in Severe Plastically Deformed Metals

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