Influence of coexisting functionalized polyalkylmethacrylates on the formation of ZnDTP-derived tribofilm

Matsui, Yuji; Aoki, Saiko; Masuko, Masabumi

doi:10.1016/j.triboint.2015.12.018

Cited by 16 publications

(16 citation statements)

References 36 publications

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“…In practice, many additives have been proven to have synergistic effects on each other when they were combined in a lubricant package [26,27]. Nevertheless, there are also a lot of additive combinations which exhibit competitive effects and reduce the functional quality of the lubricant fluid [28,29]. Therefore, it is essential to investigate the effect of CPCa and Ni nanoparticles in the tribological performance of ZDDP-containing Polyalphaolefin (PAO) oil.…”

Section: Introductionmentioning

confidence: 99%

Synergistic and Competitive Effects between Zinc Dialkyldithiophosphates and Modern Generation of Additives in Engine Oil

Huynh

Pham

2021

Lubricants

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The increasing demand for low-viscosity engine oil has underscored the role of zinc dialkyldithiophosphates (ZDDP) as a conventional anti-wear and antioxidant additive. It is essential to investigate the influence of modern additives such as cyclopropanecarboxylic acid (CPCa) and Ni nanoparticles on the tribological performance of ZDDP for practical commercial oil application. According to the experimental results, Ni nanoparticles formed a protective film that exhibited a synergistic effect with ZDDP. A significantly higher concentration of sulphur in the tribofilm was detected compared to ZDDP by itself, which was responsible for a 27.6% lower wear loss. Meanwhile, a competitive effect between CPCa and ZDDP resulted in a dramatic increase in friction and unstable anti-wear performance. This was demonstrated by a localized formation of the ZDDP tribofilm on the wear surfaces after the friction test. These results have highlighted the synergistic and competitive effects of emerging additives (CPCa and Ni nanoparticles) in the ZDDP tribofilm formation between the sliding steel contacts. This further suggests a new approach to increase the efficiency of ZDDP’s tribological performance at cold start-up processes.

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Section: Introductionmentioning

confidence: 99%

Synergistic and Competitive Effects between Zinc Dialkyldithiophosphates and Modern Generation of Additives in Engine Oil

Huynh

Pham

2021

Lubricants

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“…Therefore, an understanding of the features of tribofilms that are derived from ZnDTP formed on sliding surfaces is very useful for improving the durability or reliability of hydraulic components. However, so far, the studies on tribofilms or its tribological properties derived from ZnDTP have been mainly focused on conventional steels [8][9][10][11][12]. For this reason, obtaining basic knowledge on tribofilms and the effects of each additive on film formation over the nitrided surface as well as its sliding feature is essential to enhance the performance of hydraulic components.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

et al. 2018

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Nitriding is one of the most popular heat treatments widely used in hydraulic sliding parts of automotive or construction machinery components. Since the nitrided steels shows great wear resistance due to its high hardness, it is widely applied to various sliding parts in the hydraulic system of construction machinery. During operation, these parts are usually lubricated with fully formulated oils, which include various additives such as dialkyldithiophosphate (ZnDTP), dispersant, detergent, etc. In this study, the tribological features of two kinds of nitrided surfaces lubricated with fully formulated oil and sample oils were evaluated by changing the combination of additive element formulations, and the effect of additive formulation on tribofilm formation and frictional property were investigated in detail. As a result, it was revealed that there is a large interaction between the nitrided surfaces and additives, the coexistence of ZnDTP and detergent affects the phosphorous-derived tribofilm formation on nitrided surface as well as their frictional properties. In particular, the low frictional characteristics of nitrided compound layer was characterized by the smoothed surface and low tribofilm formation on the track.

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“…This indicates no zinc polyphosphates, metaphosphates, or metal phosphates formation in the tribofilm that was responsible to protect the surface from wear. 51–53…”

Section: Resultsmentioning

confidence: 99%

Chromium nitride-coated copper beryllium as a cam tappet material candidate

Özkan

Türküz²

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Copper beryllium (CuBe) with good mechanical and high electrical conductivity properties is used in metalworking, electronic devices, automotive systems, and aerospace systems. Having low hardness limits its usage in tribosystems such as internal combustion engine valve train systems. In this study, heat-treated CuBe material was coated with CrN under a micron thickness by cathodic arc physical vapor deposition (arc-PVD) to improve wear resistance not only at unlubricated condition but also at the lubricated condition for tribosystem, especially a material candidate for cam tappets. Therefore, CrN-coated CuBe, CuBe, and AISI52100 steel samples were tested by a tribometer at unlubricated and lubricated sliding conditions. Surface morphological changes and tribochemical formation were investigated by optical microscope, optical profilometer, atomic force microscope, and scanning electron microscope. The results showed that CrN increased the wear resistance of the CuBe significantly, and it can be used as cam tappet material both on unlubricated and boundary lubrication regimes.

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Influence of coexisting functionalized polyalkylmethacrylates on the formation of ZnDTP-derived tribofilm

Cited by 16 publications

References 36 publications

Synergistic and Competitive Effects between Zinc Dialkyldithiophosphates and Modern Generation of Additives in Engine Oil

Synergistic and Competitive Effects between Zinc Dialkyldithiophosphates and Modern Generation of Additives in Engine Oil

Tribological Properties of Nitrided Steels Lubricated with Fully Formulated Oils in Boundary Lubrication Condition

Chromium nitride-coated copper beryllium as a cam tappet material candidate

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