Microstructural aspects of lubricated mild wear with zinc dialkyldithiophosphate

Martin, Jean‐Michel; Mansot, Jean-Louis; Berbezier, I.; Belin, M.; Balossier, G.

doi:10.1016/0043-1648(86)90165-1

Cited by 33 publications

(18 citation statements)

References 10 publications

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“…The wear debris were collected around the wear scar for analytical TEM observations (see detail for this kind of analysis in ref. [16]). The results suggest that the wear debris material is a molybdenum and iron phosphate glass ( fig.…”

Section: In Vacuo Friction Of Moddp Chemisorbed Additive Film On Steelmentioning

confidence: 99%

Tribochemistry of ZDDP and MoDDP chemisorbed films

et al. 1996

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By means of a UHV analytical AES/XPS pin-on-flat tribotester, we have investigated tribochemical change as well as transfer mechanisms in static reaction films on steel from ZDDP (anti-wear) and MoDDP (friction modifier) lubricant additives. The results show that solid ZDDP reaction films are able to strongly reduce friction to a value of 0.1-0.3 (in the absence of a film, steel-on-steel gives a friction coefficient value of up to 2). MoDDP reaction films produce ultra-low friction (below 0.05) after an induction period. In situ AES analysis and energy-filtered XPM gave definitive evidence of frictioninduced chemical changes and selective material transfer from the flat to the pin. In the ease of MoDDP, the thiophosphate film is decomposed and a "MoS2" residual film is found in the wear scar on the pin.

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Section: In Vacuo Friction Of Moddp Chemisorbed Additive Film On Steelmentioning

confidence: 99%

Tribochemistry of ZDDP and MoDDP chemisorbed films

et al. 1996

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“…Over the years, lots of microstructural studies and investigations related to the chemical nature of the reaction layers were done. In particular, Martin et al applied analytical techniques such as electron energy loss spectroscopy (EELS), X-ray adsorption fine structure analysis (EXAFS) or X-ray absorption near-edge spectroscopy (XANES) to reveal the chemical composition and structure of said layers [10][11][12][13]. Despite the use of high resolution and sophisticated analytical methods, there is still a controversial issue concerning the specific reaction pathways and kinetics of the ZDDP layer formation [1].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Chemical Characterization of the Tribolayer Formation in Highly Loaded Cylindrical Roller Thrust Bearings

et al. 2016

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Zinc dithiophosphates (ZDDP) have been widely applied in automobile industry for over 70 years as a lubricant additive for wear protection. Tribolayers have been described as blue-and brown-colored layers on surfaces observed by microscopical observation or even bare eye presumably as a consequence of layer thickness or chemical composition. However, the reaction pathways of ZDDP tribolayers are still not yet fully understood. In the present study, the difference between the blue-and brown-colored tribolayers has been revealed by high resolution methods in cylindrical roller thrust bearings at relatively high contact pressures of around 1.92 GPa. After running a FE8 standard bearing test with a normal load of 80 kN and a temperature of 60˝C, said tribolayers could be identified on the bearing surfaces. By using Raman spectroscopy, it could be shown that the blue-colored layers are enriched by FeS and ZnS whereas the brown-colored layers show a significant amount of Fe 3 O 4 . This is an interesting finding as it clearly shows a correlation between the color appearance of the films and the chemical composition besides potential film thickness variations. Finally, transmission electron microscopy verified the amorphous nature of the formed tribolayer which is in a good agreement with literature.

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“…Especially when these results can be correlated to physical or chemical transformations responsible for the breakdown of the lubricant performance [1] or to emergence of tribological phases which can have positive or negative influences on friction and wear processes [2][3][4]. This article is a first attempt of a simultaneous experimental measurement of pressure, lubricant film thickness and temperature in a pure rolling EHL contact.…”

Section: Introductionmentioning

confidence: 99%

In Situ Raman Microspectrometry of Lubricated Tribologic Contacts. Part Two: Simultaneous Measurements of Pressure, Lubricant Film Thickness and Temperature Distributions in a Running EHD Contact

Himmel¹,

Mansot²,

Bercion

et al. 2010

Tribol Lett

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Raman micro-spectrometry is used to acquire point spectra in a running EHL contact. The quantitative method developed in part one of this study, measuring the lubricant film thickness, is complemented by a data treatment yielding quantitative values of the pressure and temperature in the lubricant. The comparison between experimentally measured pressure and film thickness distributions and numerical calculations shows an excellent quantitative agreement. The simultaneous quantitative measurement of pressure, film thickness and temperature distribution carried under pure rolling afforded a direct and quantitative correlation between the three parameters.

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Microstructural aspects of lubricated mild wear with zinc dialkyldithiophosphate

Cited by 33 publications

References 10 publications

Tribochemistry of ZDDP and MoDDP chemisorbed films

Tribochemistry of ZDDP and MoDDP chemisorbed films

Microstructural and Chemical Characterization of the Tribolayer Formation in Highly Loaded Cylindrical Roller Thrust Bearings

In Situ Raman Microspectrometry of Lubricated Tribologic Contacts. Part Two: Simultaneous Measurements of Pressure, Lubricant Film Thickness and Temperature Distributions in a Running EHD Contact

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