Mechanisms of MoS2 formation by MoDTC in presence of ZnDTP: effect of oxidative degradation

Bouchet, Maria Isabel De Barros; Martin, Jean‐Michel; Mogne, Th. Le; Bilas, Philippe; Vacher, Béatrice; Yamada, Yasuhisa

doi:10.1016/j.wear.2004.11.019

Cited by 97 publications

(40 citation statements)

References 9 publications

(8 reference statements)

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“…The spectrum with the highest intensity (not shown) and lowest noise was for tribofilm E. Evidence for MoS 2 is well documented, 17,19,21,63-67 however the present data suggest that the higher temperatures facilitate the formation of MoS 2 probably due to the higher rate of decomposition of ZDDPs thus providing a surplus of S 22 ions as suggested previously. 65 …”

Section: Molybdenummentioning

confidence: 99%

Chemical and mechanical analysis of tribofilms from fully formulated oils Part 1 – Films on 52100 steel

Pereira

Lachenwitzer

Kasrai

et al. 2007

Tribology - Materials, Surfaces & Interfaces

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The authors report, for the first time, a comprehensive chemical and mechanical characterisation of antiwear films prepared from a fully formulated oil that is commercially available. Wear increases substantially when using the fully formulated oil compared to using ZDDP alone. X-ray absorption near edge structure (XANES) spectroscopy at the P K-and L-edges, S K-edge, Mo Ledge, B K-edge, Ca L-edge, O K-edge and Fe and Zn L-edges permits chemical characterisation of the major elements in the thin films. Ca phosphates, ZnS and MoS 2 are the main P and S species formed, contrary to previous studies involving only ZDDPs, whereby Zn phosphates are the dominant species. These findings can be accounted for by using the hard and soft acid and bases (HSAB) principle. Small amounts of CaCO 3 are present, but no B was detected, implying it does not become incorporated into the film. Atomic force microscopy (AFM) reveals continuous pads with a relatively uniform indentation moduli (125¡10 GPa), separated by trenches that are essentially comprised of uncovered steel substrate.

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Section: Molybdenummentioning

confidence: 99%

Chemical and mechanical analysis of tribofilms from fully formulated oils Part 1 – Films on 52100 steel

Pereira

Lachenwitzer

Kasrai

et al. 2007

Tribology - Materials, Surfaces & Interfaces

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“…An abrasive wear mechanism for DLC material when lubricated with oil containing MoDTC friction modifier was proposed by Shinyoshi et al [5] and confirmed by Haque et al [6]. In these studies it has been hypothesized there is an interaction between the DLC coating and the MoO3 particles, derived from MoDTC decomposition [7,8]. However other authors [9] have demonstrated that there is no direct correlation between the DLC wear and MoO3 concentration.…”

Section: Introductionmentioning

confidence: 98%

MoDTC lubrication of DLC-involving contacts. Impact of MoDTC degradation

Feo

Bouchet

Minfray

et al. 2016

Wear

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Recently Diamond-Like Carbon (DLC) coatings have attracted considerable attention due to their low friction, high hardness, good wear and corrosion resistance, high thermal and chemical stability. Although considerable research has been conducted on the effect of molybdenum-based additive, e.g. molybdenum dithiocarbamate (MoDTC), on the boundary lubrication of DLC coatings, the wear mechanisms leading to the coating removal are not fully understood to date. Moreover, the impact of degradation of MoDTC-containing base oil on the tribological properties of DLC coatings has not been investigated. This study could help to elucidate the mechanisms by which the coating is worn out in presence of MoDTC-containing base oil. In this work, the friction and wear performances of different types of DLC coatings with different hydrogen contents and doping elements have been investigated in presence of MoDTC-containing base oil. To enable the correlation between these changes and the modification of contact surface chemistry, tribofilms generated during friction were investigated by SEM combined with Energy Dispersive X-ray Spectrometry (EDX) and X-ray Photoelectron Spectroscopy (XPS). A new mechanism explaining the severe wear experienced by DLC coatings when lubricated with a MoDTC-containing base oil is proposed.

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“…Hence we studied adding appropriate amount of anti-friction agent to the formula to reduce the wear between rubber and mixer chamber wall during the mixing process. Many studies have shown that molybdenum dithiocarbamate (MoDTC) has the best antifriction effect at 250 • C while losing its antiwear effect at 320 • C. However, MoDTC decomposes into molybdenum disulfide (MoS 2 ) at 125 • C, which has better antiwear performance [11,12]. In this study, we chose solid MoDTC not only because of its good performance but also because the solid particles are more easily dispersed in the mixing process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding MoDTC on the Properties of Carbon Black Rubber and the Friction and Wear of Metal during Mixing Process

et al. 2020

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The gap between the rotor and the mixer chamber wall is an important factor in determining filler dispersion in rubber compounds. The inner wall of a mixer will wear after working for a long time, which will cause poor filler dispersion and affect the quality of rubber products. In this study, MoDTC was added to carbon black as a kind of filler, and the effect on filler dispersion, the properties of the rubber product, and the friction and wear of rubber and metal in the mixing process were examined. Experimental data showed that after adding 3 phr of MoDTC, carbon black dispersion was greatly improved, the curing time was shortened, and the performance remained stable. It was also found that the Mo element of the compound with 3 phr MoDTC dispersed better than that of the other compounds. Most importantly, adding 3 phr of MoDTC greatly reduced the amount of wear on the metal during the mixing process. However, the opposite effect occurred when the MoDTC content was high. The method proposed in this study can not only improve filler dispersion in rubber but also reduce metal wear to prolong the service life of the mixing chamber when applied to an actual mixing process.

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Mechanisms of MoS2 formation by MoDTC in presence of ZnDTP: effect of oxidative degradation

Cited by 97 publications

References 9 publications

Chemical and mechanical analysis of tribofilms from fully formulated oils Part 1 – Films on 52100 steel

Chemical and mechanical analysis of tribofilms from fully formulated oils Part 1 – Films on 52100 steel

MoDTC lubrication of DLC-involving contacts. Impact of MoDTC degradation

Effect of Adding MoDTC on the Properties of Carbon Black Rubber and the Friction and Wear of Metal during Mixing Process

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