Preface

Stachowiak, Gwidon; Batchelor, Andrew W.

doi:10.1016/s0167-8922(08)70573-x

Cited by 111 publications

(177 citation statements)

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“…Carbon-based films are often used in lubricated contact; however, their tribochemical interaction with oils is not well known [12,13] . It has been shown that the wetting of surfaces is a very important property in boundary lubrication conditions, since it determines the slip at the solid-liquid interface [14] .…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Moreover, several biodegradable oils possess a good lubricating ability (good anti-wear properties and low friction), often much better than mineral or conventional synthetic oils [13,18] as a result of the large amount of unsaturated and polar component; however, their main drawback is the low oxidation resistance and thermal stability [18][19][20] .…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication

Balestra

Castro

Evaristo

et al. 2011

Surface and Coatings Technology

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We deposited C-based films doped with Cu and tested their sliding properties in olive oil as environment-friendly lubricant, which can be used in many mechanical systems, particularly in agriculture engineering. The coatings were deposited in a four unbalanced magnetron sputtering device combining C and C/Cu targets; argon (hydrogen-free films) and Ar/CH 4 (hydrogenated films) atmospheres were used. Cu content of the films was in the range 5-14 at.%. The hardness of the films was almost constant whatever the Cu content was. On the other hand, hydrogen-free coatings were much harder (about 15 GPa) than hydrogenated ones (about 4 GPa). The coatings were oleophilic and their sliding properties were evaluated using ball-on-plate tests with 200000 cycles. The non-hydrogenated coating with 6 at.% of copper showed the best tribological performance with negligible wear for all olive oil testing temperatures (i.e. up to 120 °C).

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication

Balestra

Castro

Evaristo

et al. 2011

Surface and Coatings Technology

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“…1) CoCr-MOM bearings exhibit extremely high survival rates over 510 years of service 2,3) owing to their excellent mechanical properties and extremely low wear rate, 47) and they are expected to serve for longer life than the present ones for younger, active patients. Despite of these encouraging results, recent reports also indicated that unexpected high failure rates for large head MOM bearings and debris detachment from the rubbing surfaces, which led to an alert from the Medicines and Healthcare products Regulatory Agency prompting an urgent review of all MOM articulations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Run-in-Stage Wear Behavior and Contact Mechanics of Metal-on-Metal Hip Joint Bearings with Different Radial Clearances

Chen

Kurosu

et al. 2015

Mater. Trans.

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We systematically elucidate the effects of radial clearance on the wear behavior of hip joint prostheses bearings during run-in-stage. The results indicated that bearings with smaller radial clearances exhibited lower wear rate and less abrasive wear characterized by mild surface roughness and sphericity. The contact mechanics and lubrication regime of MOM bearings with different radial clearances were also analyzed, indicating that bearings with radial clearance of ³20 µm was more beneficial for small contact pressures even the enlarged clearance made the bearings operate under a full-fluid-to-mixed lubrication during wear. The agreement between the experimental results of wear rate (mm 3 /Mc) and contact mechanics and lubrication analysis indicated that the radial clearance significantly affected the wear behavior of the MOM bearings.

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“…However, the majority of machine components operate under lubricated conditions, mostly under boundary lubrication, where interactions between the oil additives, surrounding oxygen and the contact surfaces determine the tribological behaviour of the contact. [1] For the successful application of DLC coatings to machine components, coatings have to be performed adequately under dry and oil-lubricated conditions, using oils originally designed for uncoated surfaces. [2] Some investigations [2 -6] reported low-friction behaviour of metalcontaining DLC coatings also under oil-lubricated conditions, with the coated/uncoated combination showing the smoothest running-in, lowest friction and low wear.…”

Section: Introductionmentioning

confidence: 99%

“…[5,6] The mechanism by which extreme-pressure (EP) and antiwear (AW) additives reduce the friction and wear of metallic surfaces under boundary lubrication is related to the formation of tribochemical films, generated by tribologically activated reactions between oil additives and the metallic surface. [1,7,8] The anti-wear action of oil additives is owing to the formation of phosphates, whereas friction reduction is controlled by the presence of sulfides. However, if the metal surface is covered by an inert DLC coating, the mechanism of conventional EP and AW additives may be changed or even prevented.…”

Section: Introductionmentioning

confidence: 99%

Tribologically activated surface layers in lubricated DLC contacts

Podgornik

Vižintin

2008

Surface & Interface Analysis

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In the past, adequate functionality of high-performance components would have been impossible without advanced lubricant additive chemistry and proper lubricant formulation. Especially anti-wear (AW) and extreme-pressure (EP) additives are crucial in minimising friction and wear and protecting contact surfaces under severe contact conditions. Introduction of diamond-like carbon (DLC) coatings, on the other hand, opens further possibilities in improving performance of highly loaded components, which can no longer be achieved only by lubricant design.The aim of the present research was to determine the mechanism responsible for the low-friction behaviour of boundary lubricated DLC coatings when lubricated with lubricants containing EP or AW additives and to investigate the influence of contact conditions. Tests were performed under reciprocating sliding motion using ball on flat test configuration, with ball-bearing steel ball being loaded against undoped and W-doped DLC-coated discs, respectively. Results of the investigation clearly show that in the case of W-doped DLC coatings, low-friction behaviour under boundary lubrication is governed by formation of WS 2 -containing tribolayers, which are contact conditions dependent and can reduce friction by more than 50%.

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Preface

Cited by 111 publications

References 0 publications

Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication

Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication

Analysis of Run-in-Stage Wear Behavior and Contact Mechanics of Metal-on-Metal Hip Joint Bearings with Different Radial Clearances

Tribologically activated surface layers in lubricated DLC contacts

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