Rheology and flows of solid third bodies: background and application to an MoS1.6 coating

Descartes, Sylvie; Berthier, Yves

doi:10.1016/s0043-1648(02)00008-x

Cited by 121 publications

(90 citation statements)

References 25 publications

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“…Size, shape, and structure of the particles will influence their rheological behavior. For example, the ability of the particles to form a 'compact' layer under the effect of normal load and shear stress, also called 'cohesion' [27,28], will determine if the behavior of the transfer film will be solid-or fluidlike [29]. In fact, all attempts to use phosphate powders as anti-wear additives have been unable to reproduce the antiwear behavior of ZnDTPs [21,30].…”

Section: Formation and Functionality Of The Transfer Filmmentioning

confidence: 99%

“…A satisfactory method for the determination of such properties has not yet been developed. Even the use of techniques such as nanoindentation would disturb the investigated layer [27]. It is now commonly accepted that third-body behavior governs friction and wear in dry contacts [27,28,31], and those same phenomena have also been found to play an important role in boundary lubrication.…”

Section: Formation and Functionality Of The Transfer Filmmentioning

confidence: 99%

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Effect of Chain-Length and Countersurface on the Tribochemistry of Bulk Zinc Polyphosphate Glasses

2012

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Zinc polyphosphate glasses are considered to be chiefly responsible for the anti-wear efficiency of ZnDTP tribofilms. In this work, the tribochemical properties of amorphous bulk zinc polyphosphates of different chain lengths (ranging from zinc metaphosphate to zinc pyrophosphate) have been investigated. Tribological tests on bulk polyphosphate discs have been carried out using steel and quartz balls as counter-surfaces in a poly-a-olefin (PAO) bath at room temperature. The composition in the wear track and on the contact region of the balls has been monitored by small-area and imaging X-ray photoelectron spectroscopy (i-XPS). The XPS analysis revealed that the composition of short-chain-length polyphosphates remained unchanged following tribological stress. Long-chain-length polyphosphates are depolymerized in the wear track as a consequence of a tribochemical reaction. By comparing the results obtained using quartz and steel balls, it could be observed that while the reaction of iron oxide with the polyphosphates certainly plays a role in the depolymerization of the samples under sliding conditions, pressure and shear stress alone and also in the presence of water or oil-oxidized species are able to depolymerize the glass when an inert material is used as counterpart; the composition of the wear track, in this case, is dependent on the applied load. All samples were able to form an adhesive, glassy transfer film on both steel and quartz balls, but the short-chain-length polyphosphates showed a lower friction coefficient and wear coefficient. The results suggest a third-body mechanism with the polyphosphates acting as a solid lubricant. Differences in tribological behavior of the different-chain-length polyphosphates are attributable to their mechanical and rheological properties.

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Section: Formation and Functionality Of The Transfer Filmmentioning

confidence: 99%

Section: Formation and Functionality Of The Transfer Filmmentioning

confidence: 99%

Effect of Chain-Length and Countersurface on the Tribochemistry of Bulk Zinc Polyphosphate Glasses

2012

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“…The EDS representative analysis of tribolayer shows that it contain Ti, Al, W, C, Co, O and N. The Fe and Cr presence is believed to be due to substrate (Table VII). According to the composition detected, the wear track consists possibly of WC and Co counterpart particles as well as of WO 3 , CoWO 4 , Al 2 O 3 and TiO 2 oxides with high cohesion and ductility [34], [37], [38]. The presence of CoWO 4 and WO 3 in the tribolayer can be related to the higher-oxygen presence by the hydrophilic capability of TiO 2 and Al 2 O 3 .…”

Section: Worn Surfacesmentioning

confidence: 99%

The Effect of Counterpart Material on the Sliding Wear of TiAlN Coatings Deposited by Reactive Cathodic Pulverization

et al. 2015

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This work aims to study the effect of the counterpart materials (100Cr6, Al2O3 and WC-Co) on the tribological properties of TiAlN thin films deposited on AISI H13 steel substrate by reactive magnetron co-sputtering. The structural characterization of the TiAlN films, performed by X-ray diffraction, showed (220) textured fcc crystalline structure. The values of hardness and elastic modulus obtained by nanoindentation were 27 GPa and 420 GPa, respectively, which resulted in films with a relatively high resistance to plastic deformation. Ball-on-disk sliding tests were performed using normal loads of 1 N and 3 N, and 0.10 m/s of tangential velocity. The wear coefficient of the films was determined by measuring the worn area using profilometry every 1000 cycles. The mechanical properties and the chemical stability of the counterpart material, debris formation and the contact stress influences the friction and the wear behavior of the studied tribosystems. Increasing the hardness of the counterpart decreases the coefficient of friction (COF) due to lower counterpart material transference and tribofilm formation, which is able to support the contact pressure. High shear stress concentration at the coating/substrate interface was reported for higher load promoting failure of the film-substrate system for all tribopairs.

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“…Berthier [4] showed that this more or less heterogeneous and discontinuous interface called "third body" can have different thicknesses (ranging from several nanometers [82] to several tens of micrometers [83]) and flow with…”

Section: From Reality To Modelingmentioning

confidence: 99%

Numerical tribology of a dry contact

Renouf

Massi

Fillot

et al. 2011

Tribology International

104

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Tribologists are confronted on a daily basis by the need to understand the causes and consequences of friction on the behaviour of bodies in contact. Understanding contact behaviour is not only a scientific curiosity but the key to solving numerous industrial issues. Numerical tools have been developed to overcome the problems encountered in experiments due to limitations in the local dynamic analysis of multi-scale systems (mechanisms, bodies in contact, interfaces). More than an exhibition of numerical results, the present paper proposes reviewing the literature on the numerical tribology of dry contacts by analysing the different scales involved. © 2011 Elsevier Ltd. All rights reserved

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Rheology and flows of solid third bodies: background and application to an MoS1.6 coating

Cited by 121 publications

References 25 publications

Effect of Chain-Length and Countersurface on the Tribochemistry of Bulk Zinc Polyphosphate Glasses

Effect of Chain-Length and Countersurface on the Tribochemistry of Bulk Zinc Polyphosphate Glasses

The Effect of Counterpart Material on the Sliding Wear of TiAlN Coatings Deposited by Reactive Cathodic Pulverization

Numerical tribology of a dry contact

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