New Emerging Self-lubricating Metal Matrix Composites for Tribological Applications

Omrani, Emad; Moghadam, Afsaneh Dorri; Menezes, Pradeep L.; Rohatgi, Pradeep K.

doi:10.1007/978-3-319-24007-7_3

Cited by 32 publications

(21 citation statements)

References 112 publications

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“…Transfer film formation has been shown to be an important mechanism governing friction and wear of many different types of self-lubricating composites [2]. However, previous studies of self-lubricating polymers have shown that the presence of water may adversely affect the wear behaviour [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear of Self-Lubricating Materials for Hydropower Applications under Different Lubricating Conditions

Berglund

Shi

2017

Lubricants

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Self-lubricating bearings in hydropower applications are often lubricated with water under boundary lubricating conditions. Polyhydric alcohols replacing water have shown the potential to reduce both friction and wear. The objective of this work is, therefore, to evaluate the effect of a polyhydric alcohol-based environmentally-acceptable lubricant (EAL) on the friction and wear of self-lubricating materials for conformal contacts under boundary lubricating conditions. The lubricating properties of four commercially-available self-lubricating bearing materials were investigated under three different lubricating conditions: dry, water and a new polyhydric alcohol-based EAL. Bearing materials include one metallic composite and three polymer composites. A reciprocating motion test rig was used to evaluate the wear and friction properties. Surface analysis was performed by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and optical profilometry. Results show that the wear rate for the polymer composites is increased when water is present compared to dry operating conditions. The new polyhydric alcohol-based EAL substantially improves both friction and anti-wear performance of all four self-lubricating bearing materials compared to both dry and water conditions. Surface analysis indicates that the material transfer to the counter-surface is limited when the polyhydric alcohol-based EAL is used.

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Section: Introductionmentioning

confidence: 99%

Friction and Wear of Self-Lubricating Materials for Hydropower Applications under Different Lubricating Conditions

Berglund

Shi

2017

Lubricants

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“…In addition to that, their shape, high aspect ratio and high flexibility rendered them as a promising candidate for solid lubrication or as a lubricant additive in tribological applications. Several studies have proved the ability of CNTs to reduce friction and wear; for example, when used as the reinforcement phase in composites [3][4][5][6][7][8][9], as a protective film [10][11][12][13], solid lubricant [8][9][10]12,14,15], or lubricant additive [16][17][18][19]. Although all of these systems show improvements to a different extent, the tribo-mechanisms inducing these effects are clearly differing and not completely understood.…”

Section: Introductionmentioning

confidence: 99%

Tribo-Mechanisms of Carbon Nanotubes: Friction and Wear Behavior of CNT-Reinforced Nickel Matrix Composites and CNT-Coated Bulk Nickel

2016

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Abstract:In this study, nickel matrix composites reinforced by carbon nanotubes (CNTs) are compared to unreinforced CNT-coated (by drop-casting) bulk nickel samples in terms of their friction and wear behavior, thus gaining significant knowledge regarding the tribological influence of CNTs and the underlying tribo-mechanism. It has been shown that the frictional behavior is mainly influenced by the CNTs present in the contact zone, as just minor differences in the coefficient of friction between the examined samples can be observed during run-in. Consequently, the known effect of a refined microstructure, thus leading to an increased hardness of the CNT reinforced samples, seems to play a minor role in friction reduction compared to the solid lubrication effect induced by the CNTs. Additionally, a continuous supply of CNTs to the tribo-contact can be considered isolated for the reinforced composites, which provides a long-term friction reduction compared to the CNT-coated sample. Finally, it can be stated that CNTs can withstand the accumulated stress retaining to some extent their structural state for the given strain. A comprehensive study performed by complementary analytical methods is employed, including Raman spectroscopy and scanning electron microscopy to understand the involved friction and wear mechanisms.

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“…In past few decades, Richard's equation as a useful tool for predicting partial saturation has been solved numerically and analytically using various numerical schemes such as the finite difference method, the finite element method, and the boundary element method for different cases of porous media, especially soils . 32 For fibrous media, Jaganathan et al solved Richard's equation in one dimensions for inclined fibrous sheets (which had been examined formerly by Landeryou et al) and were able to predict the region of partial saturation. Furthermore, they validated their partial saturation predictions experimentally.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous imbibition of liquid in glass fiber wicks, Part II: Validation of a diffuse‐front model

Zarandi

Pillai

2017

AIChE Journal

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In Part I (Zarandi MAF, Pillai KM. Spontaneous Imbibition of Liquids in Glass‐Fiber Wicks. Part I: Usefulness of a Sharp‐Front Approach. AIChE J, 64: 294–305, 2018), a model based on sharp liquid‐front was proposed where a good match with the experimental data was achieved. However, the model failed to account for partial saturations in the wicks. Here, Richard's equation to predict liquid saturation is tried where the equation is solved numerically in 3D using COMSOL and analytically in 1D using Mathematica for glass‐fiber wicks after treating them as transversely‐isotropic porous media. As a novel contribution, relative permeability and capillary pressure are determined directly from pore‐scale simulations in wick microstructure using the state‐of‐the‐art software GeoDict. The saturation along the wick length is determined experimentally through a new liquid‐N2 based freezing technique. After including the gravity effect, good agreements between the numerical/analytical predictions and experimental results are achieved in saturation distributions. We also validated the Richard's equation based model while predicting absorbed liquid‐mass into the wick as function of time. © 2017 American Institute of Chemical Engineers AIChE J, 63: 306–315, 2018

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New Emerging Self-lubricating Metal Matrix Composites for Tribological Applications

Cited by 32 publications

References 112 publications

Friction and Wear of Self-Lubricating Materials for Hydropower Applications under Different Lubricating Conditions

Friction and Wear of Self-Lubricating Materials for Hydropower Applications under Different Lubricating Conditions

Tribo-Mechanisms of Carbon Nanotubes: Friction and Wear Behavior of CNT-Reinforced Nickel Matrix Composites and CNT-Coated Bulk Nickel

Spontaneous imbibition of liquid in glass fiber wicks, Part II: Validation of a diffuse‐front model

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