Carbon Nanoparticle‐Reinforced Metal Matrix Composites: Microstructural Tailoring and Predictive Modeling

Reinert, Leander; Súarez, Sebastián; Müller, Thomas; Mücklich, Frank

doi:10.1002/adem.201600750

Cited by 13 publications

(11 citation statements)

References 40 publications

(59 reference statements)

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“…In order to use the MWCNT as reinforcement phase in nickel matrix composites, they have to be disentangled, which is done using a colloidal dispersion and mixing process. For this process, ethylene glycol is used as a solvent, as it allows for fine and stable dispersions of MWCNTs [30,35,36,42]. Dispersing the nanoparticles in the solvent was done using a shear mixer (Ultra-turrax T-25 by IKA) for 5 min, followed by treatment in an ultrasonic bath (Sonorex Super RK 514 BH by Bandelin, 860 W, 35 kHz) for another 20 min.…”

Section: Composite Productionmentioning

confidence: 99%

“…With the given parameters, a densification of at least 95% is reached. The sintering parameters have been chosen based on a previously developed model predicting the final microstructure of these composites after sintering [35]. After the densification process, the cylindrical samples are ground flat on both sides and are polished using a diamond slurry containing diamond particles of 3 µm in diameter on one side.…”

Section: Composite Productionmentioning

confidence: 99%

“…In self-lubricating materials, metal matrix composites are of much interest due to their high technological relevance, the ability to tailor their microstructure and the possibility to incorporate solid lubricants as reinforcement phases [31][32][33][34]. For example, it is well known that the microstructures of composites, and thus their mechanical and tribological properties, can be adjusted by varying the type and amount of the reinforcement phase [35][36][37]. This is mainly attributed to a grain refinement control (pinning effect), which leads to higher strength of the composite.…”

Section: Introductionmentioning

confidence: 99%

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Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces

Reinert

Varenberg

Mücklich

et al. 2018

Wear

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The unfavorable environmental conditions of certain tribological systems, such as operation at high temperatures or under vacuum, set the need to replace liquid with solid lubricants. Multi-Wall-Carbon Nanotubes (MWCNTs) have been emphasized as a very effective solid lubricant. The particles have been used to create self-lubricating materials by acting as reinforcement phase in composites or as solid-lubricant coating that works in conjunction with textured surfaces to prevent the removal of particles from the contact. However, both approaches are restricted to some extent. In the case of composites, the solid lubricant concentration is limited so as not to influence the mechanical stability of the final component. For coated surface structures, the textured surfaces can degrade during the experiment. The present study focuses on the combination of these approaches in order to create enhanced self-lubricating surfaces with MWCNTs as the solid lubricant. A custom-made ring-on-block tribometer is used to study the behavior of laser textured MWCNT-coated and MWCNT-reinforced nickel matrix composites under the conditions of unidirectional sliding in conformal contact. It is shown that the combination of both approaches allows for a maximum 4-fold reduction in friction and a 115-fold reduction in wear rate compared to the reference. Additionally, the lubrication mechanism of the MWCNTs is investigated in more detail and a structural degradation model of the mechanically stressed MWCNTs is proposed. Our results highlight the integrated solution as a suitable approach for self-lubricating surfaces subjected to unidirectional sliding.

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Section: Composite Productionmentioning

confidence: 99%

Section: Composite Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces

Reinert

Varenberg

Mücklich

et al. 2018

Wear

Self Cite

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“…As shown in reference [42], the CNP concentration strongly affects the composites' microstructure if near-full densification (> 98%) is achieved. With the aim of obtaining a simplified system, the sintering parameters were chosen so as to avoid differences in the microstructure of the matrix, irrespective of the type and amount of CNP [42]. Nonetheless, the parameters are sufficient to achieve a good densification of the composite (at least 92%).…”

Section: Materials and Manufacturingmentioning

confidence: 93%

“…A dispersion analysis of these particular CNPs in the composite as well as a model to control and predict the final microstructure after sintering was published by our work group before [41,42]. Based on these works, it is possible to produce composite materials reinforced by these CNPs, which feature the same final microstructure and hardness.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of self-lubricating carbon nanoparticle reinforced metal matrix composites

Reinert

Green

Gimmler

et al. 2018

Wear

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The present study focuses on investigating the dominant friction and wear mechanisms in case of dry sliding of carbon nanoparticle reinforced nickel matrix composites under elastic and elasto-plastic contact conditions. For this purpose, multi-wall carbon nanotubes (CNT), onion-like carbon (OLC) and nanodiamonds (nD) were chosen to represent a large variety of carbon nanoparticles as they can be systematically distinguished regarding their carbon hybridization state (sp 2 vs. sp 3) as well as their morphology and size ("0D" vs. "1D"). Contact simulations based on the Greenwood-Williamson model are conducted in order to calculate the required contact loads. Friction and wear analysis is supported by complementary characterization techniques, including scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, light microscopy as well as laser scanning microscopy. It is found, that only CNT provide efficient lubrication as reinforcement phase in composites, presenting different lubrication mechanisms for the tested contact conditions. The high aspect ratio of CNT is found to be essential for the lubrication mechanisms, allowing the particles to be dragged into the direct tribological contact. The lubrication effect increases with increasing volume content of CNT, reaching a maximum steady state frictional reduction of 50% compared to the unreinforced nickel reference.

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Reinforcement in Al Matrix Composites: A Review of Strengthening Behavior of Nano‐Sized Particles

2018

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Aluminum matrix composites (AMCs) reinforced with the nano‐sized particles are very important materials for the applications in industrial fields. These aluminum matrix composites consist of an aluminum matrix and nano‐sized particles, which own very different physical and mechanical properties from those of the matrix. Nano‐sized particles show a more obvious strengthening effect on the matrix than the micro‐sized particles do, because of the high specific surface area which is positive for the pinning effect during the deformation process. Thus, the nano‐sized particle‐reinforced AMCs usually exhibit a good ductility. The main issues of the fabrication methods are the low wettability between the nano‐sized particles and the molten aluminum alloys, which is fatal to the conventional casting methods, and the agglomeration of nano‐sized particles which happened easier than the larger particles. Several alternative processes have been presented in literature for the production of the nano‐sized particle‐reinforced aluminum composites. This paper is aimed at reviewing the feasible manufacturing techniques used for the fabrication of nano‐sized particle‐reinforced aluminum composites. More importantly, the strengthening mechanisms and models which are responsible for the improvement of mechanical properties of the nano‐sized particle‐reinforced aluminum composites have been reviewed.

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Carbon Nanoparticle‐Reinforced Metal Matrix Composites: Microstructural Tailoring and Predictive Modeling

Cited by 13 publications

References 40 publications

Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces

Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces

Tribological behavior of self-lubricating carbon nanoparticle reinforced metal matrix composites

Reinforcement in Al Matrix Composites: A Review of Strengthening Behavior of Nano‐Sized Particles

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