The Effect of the Chemical Structures of Synthetic Hydrocarbon Oils on Their Tribochemical Decomposition

Lü, Renguo; Nanao, Hidetaka; Takiwatari, Koji; Mori, Shigeyuki; Fukushima, Yoshinori; Murakami, Youichi; Ikejima, Shozo; Konno, Tadaaki

doi:10.1007/s11249-015-0606-2

Cited by 10 publications

(11 citation statements)

References 14 publications

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“…Although gas evolution from ADE ceased after 70 m of sliding, hydrogen evolution observed during MAC-impregnated friction tests continued in excess of 2,000 m. Moreover, MAC was capable of undergoing decomposition in the presence of a polished steel friction disk after an induction period [7]; recall that ADE was not able to decompose under these conditions [13], even after 53 km of sliding distance. Therefore, it can be concluded that the rough steel surface plays an important role during the observed decomposition of ADE.…”

Section: Resultsmentioning

confidence: 96%

“…Factors predicted to affect the reaction characteristics of the tribochemical decomposition of lubricant oils include the molecular structure of the oil, material, and contact conditions. When alkyl diphenyl ether (ADE) was used as the sample oil, no decomposition was observed after 53 km of friction under identical conditions to those in which MAC decomposed [13]. This result suggests that ADE was more stable than MAC under tribochemical decomposition on a flat steel surface, and confirms that the molecular structure of the synthetic oil affects the reaction.…”

Section: Introductionmentioning

confidence: 89%

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Effect of Surface Roughness on Tribochemical Decomposition of Synthetic Oils under High-Vacuum Conditions

et al. 2019

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This study investigates the effects of both, molecular structure and surface roughness, on the tribochemical decomposition of synthetic base oils under high-vacuum conditions. Nascent steel surfaces exhibit high activity to catalyze the decomposition of synthetic oil under lubricating conditions. Decomposition was performed on multiply alkylated cyclopentane (MAC) and alkyl diphenyl ether (ADE) at the nascent surface of bearing steel 52100 and was monitored by a ball-on-disk friction tester in a vacuum chamber attached to a quadrupole mass spectrometer. Although MAC decomposed, ADE did not decompose on the flat steel surface. Steel surfaces used within this experiment underwent procedural abrasion, providing the requisite roughness to generate the nascent steel surface for the friction test. Decomposition of ADE and desorption of benzene were observed in the presence of the nascent steel surface under friction. As the surface morphology of the pretreated roughened surfaces changed during friction, the contact pressure and plasticity of the surface decreased. We concluded that the tribochemical decomposition of ADE was accelerated on rough steel surfaces by the generation of a nascent surface at the point of metal-metal contact. From these results, the critical role of a nascent steel surface on the tribochemical decomposition of syntheticoils is discussed.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 89%

Effect of Surface Roughness on Tribochemical Decomposition of Synthetic Oils under High-Vacuum Conditions

et al. 2019

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“…Species of tribochemical products generated at the interface were detected with a QMS (ST-200, ULVAC Inc., Japan) in the vacuum chamber. Details of the apparatus have been described elsewhere ( 15 ).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, for the tribochemical reactions, we developed a ball-on-disk tribometer with a quadrupole mass spectrometer (QMS) in a high-vacuum test chamber that is able to detect the detailed number and species of tribochemical reaction products in operando conditions during the friction process. The QMS operando analyzer has been successfully used to elucidate various reactions, such as the tribochemical decomposition of hydrocarbon oils ( 15 ). Furthermore, advances in high-performance supercomputer systems and high-accuracy reactive MD potentials have allowed large-scale reactive MD simulations to reveal tribochemical reaction dynamics and the mechanisms of structural changes during the sliding of materials.…”

Section: Introductionmentioning

confidence: 99%

Triboemission of hydrocarbon molecules from diamond-like carbon friction interface induces atomic-scale wear

Wang

Yamada

et al. 2019

Sci. Adv.

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“…ADEs are also used as pump oils because of their low evaporation and small change in viscosity, even at high temperature. On an AISI 52100 steel surface, the tribochemical decomposition of ADEs was found to be negligible, even after a long period of friction, and no hydrogen was generated during friction [10]. It was found that hydrogen embrittlement that was caused by hydrogen ingress greatly decreased when ADE was used as the base oil in bearing grease [11].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Alkyldiphenylethers in Boundary Lubrication

et al. 2019

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Lubricants that are used in miniaturized moving mechanical components generally serve under severe conditions, such as high temperature, high speed, and high load. Although alkyldiphenylethers (ADEs) are used as base oils for high-temperature greases, their tribological properties remain unclear. This study investigated the influence of the alkyl chains on the tribological properties of ADEs. Longer and more attached alkyl chains decreased the friction coefficient of ADEs under both reciprocating and continuous sliding conditions. Wear was found to be independent of the alkyl chain under reciprocating sliding conditions due to abrasion being caused by debris that was not readily removed. ADEs showed good anti-wear properties when used as either a lubricant or an additive under continuous sliding conditions. Much smoother surfaces in the friction track were observed in comparison to poly-α-olefin. Fourier-Transform infrared spectroscopy analysis suggested that the ether groups were attracted to the worn steel surface, phenyl groups became consequently perpendicular, and the attached alkyl chains repelled other substances and prevented further wear of the surface. Moreover, ADEs showed a high adaptability with traditional additives.

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The Effect of the Chemical Structures of Synthetic Hydrocarbon Oils on Their Tribochemical Decomposition

Cited by 10 publications

References 14 publications

Effect of Surface Roughness on Tribochemical Decomposition of Synthetic Oils under High-Vacuum Conditions

Effect of Surface Roughness on Tribochemical Decomposition of Synthetic Oils under High-Vacuum Conditions

Triboemission of hydrocarbon molecules from diamond-like carbon friction interface induces atomic-scale wear

Tribological Properties of Alkyldiphenylethers in Boundary Lubrication

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