X-ray absorption study of antiwear films generated from ZDDP and borate micelles

Varlot, K.; Kasrai, M.; Bancroft, G.M.; Yamaguchi, E. S.; Ryason, P. R.; Igarashi, Jinichi

doi:10.1016/s0043-1648(01)00586-5

Cited by 56 publications

(28 citation statements)

References 8 publications

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“…Under boundary lubrication conditions, the formation of tribochemical films (so-called tribofilm) on the contact surfaces protects metallic surfaces from wear. Such films are generated by tribologically activated reactions between lubricant additives (friction modifiers, anti-wear and extreme pressures) and the metallic surface [25]. However, when the surface is coated by an inert low-friction carbon-based coating, the mechanism of conventional additives may be hindered or even prevented.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Ciarsolo

Fernández

Gopegui

et al. 2014

Surface and Coatings Technology

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The use of carbon-based coatings (hydrogenated and non-hydrogenated DLC, doped and alloyed-DLC) is of a wide interest due to its applications in mechanical components submitted to friction and wear including sliding parts in automotive engines. A tribological comparative analysis using a reciprocating (SRV) tester in lubricated and unlubricated conditions with a 4-stroke motor oil has been carried out on six currently relevant state-of-the-art coatings (namely WC/a-C, TiBC/a-C and TiC/a-C:H nanocomposites, Ti-doped DLC, BCN film and a crystalline monolithic TiC film as reference). The quantification of the fraction of the sp 2 -bonded matrix has been done by fitting of C1s XPS peak and the mechanical properties evaluated by nanoindentation. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2The comparative analysis has allowed us to identify the capabilities of each system This fundamental information would be of relevance for assisting engineers in selecting best partnership for lubrication systems.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Ciarsolo

Fernández

Gopegui

et al. 2014

Surface and Coatings Technology

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“…However, other studies have shown that borate sulfonates do not enhance the wear performance (VarIot, et a1. (20)). In previous related studies (Kim, et a1.…”

Section: Specimensmentioning

confidence: 99%

Synergistic Effects of Boron-, Sulfur-, and Phosphorus-Containing Lubricants in Boundary Lubrication of Steel Surfaces

Komvopoulos

Pernama

et al. 2005

Tribology Transactions

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The effectiveness ofvarious combinations ofborate-, sulfur-, and phosphorus-containing additives blended in gear oil to form antiwear tribofilms on steel surfaces sliding in the boundary lubrication regime was investigated experimentally. The formation ofprotective tribofilms and their tribochemical activity in the temperature range of32-100°C were analyzed in terms of coefficient offriction and contact voltage results. The antiwear performance obtained with each blend was evaluated by wear volume calculations based on surface profilometry measurements. Scanning electron microscopy studies provided insight into the dominant wear mechanisms at various temperatures. The tribological performance of the tribofilms and associated wear mechanisms were found to depend strongly on the type of additive(s), tribofilm composition, and temperature. This study has revealed that sulfide-dominated tribofilms produce lower friction, whereas borate-and phosphate-dominated tribofilms are more effective in increasing the wear resistance of the steel surfaces.

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“…Commonly used additives in the lubricants are zinc dialkyl dithiophosphate and molybdenum dialkyl dithiocarbamate, etc. The function of additives is to react with contacting surface and form tribofilms which protect the surfaces from wear [9] especially during boundary lubrication. However, environmental and health issues constraint the extensive usage of these additives.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite UHMWPE–CNT Polymer Coatings for Boundary Lubrication on Aluminium Substrates

Samad

Sinha

2010

Tribol Lett

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The boundary lubrication regime plays a very important role in determining the life span of any of the two mating parts under liquid-lubricated conditions. It is during the start\stop cycles when insufficient fluid is available to fully separate the surfaces in relative motion and thus unusual wear takes place; a case of boundary lubrication. The aim of this work is to study the feasibility of using polymer coatings as boundary lubricants. This study investigates the friction and wear properties of ultrahigh molecular weight polyethylene (UHMWPE) films coated on aluminium substrates under dry and base oil (without any additives)-lubricated conditions. In order to increase the load bearing capacity of the UHMWPE coatings, 0.1 wt% of single-walled carbon nanotubes are added. Experiments are carried out on a custom-built tribometer simulating a line contact between a polymercoated cylindrical Al surface (shaft) and a flat uncoated Al plate as the counterface. The experimental parameters such as the normal load and the sliding speed are selected to simulate the boundary and mixed lubrication regimes for comparison purposes. Specific wear rates of the polymer films and bare Al surface under lubricated conditions are also calculated. Stribeck curves have been generated to evaluate the effectiveness of the pristine UHMWPE and the nanocomposite coatings in the various regimes of lubrication, especially the boundary lubrication regime. It is observed that the selected polymer coatings are effective in protecting the metallic surfaces without causing any observable oil contamination with wear debris.

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X-ray absorption study of antiwear films generated from ZDDP and borate micelles

Cited by 56 publications

References 8 publications

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Synergistic Effects of Boron-, Sulfur-, and Phosphorus-Containing Lubricants in Boundary Lubrication of Steel Surfaces

Nanocomposite UHMWPE–CNT Polymer Coatings for Boundary Lubrication on Aluminium Substrates

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