Properties, functions and applications of commonly used lubricant additives: A review

Singh, Anurag; Verma, Neeraj; Mamatha, T.G.; Kumar, Amit; Singh, Sanjay; Kumar, Krishan

doi:10.1016/j.matpr.2021.01.029

Cited by 26 publications

(17 citation statements)

References 96 publications

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“…This occurred because the base oil cannot provide an evenly lubricated surface during pair contact, so the surfaces of the steel ball pairs are in direct contact, and the friction coefficient rises rapidly. As a result of its synergetic friction coefficient, the MGTC composite nanolubricating oil additives reduced the friction coefficient in the wear region by reducing direct contact between the friction pair and by filling the wear area with graphene and titanium dioxide …”

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

“…As a result of its synergetic friction coefficient, the MGTC composite nanolubricating oil additives reduced the friction coefficient in the wear region by reducing direct contact between the friction pair and by filling the wear area with graphene and titanium dioxide. 25 While the coefficient of friction decreased slightly following addition of the additive, addition of 1.5 wt % of the additive actually resulted in a slight increase in the coefficient of friction. The primary reason for this was that more abrasive particles were introduced onto the pair surfaces when excess nano TiO 2 was added.…”

Section: Tribological Performance Analysismentioning

confidence: 97%

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Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

et al. 2022

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The unique structure and physical properties of graphene and anatase TiO2 make them suitable for use as additives for engine lubricants. This study describes the use of dielectric barrier discharge plasma-assisted ball milling to synthesize a multilayer graphene-reinforced TiO2 composite nanolubricant additive (MGTC). A variety of physical and chemical tests were performed to characterize the resulting experimental materials, including X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Raman, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Four-ball friction and wear testing machines were used to study the tribological properties and extreme pressure anti-wear properties of a base oil containing 0.1, 0.5, 1.0, and 1.5 wt % of the modified TiO2. Raman spectroscopy, XPS, SEM, and energy-dispersive spectrometry (EDS) analyses were used to examine and analyze the microstructure of the friction pairs. As a result of the plasma-assisted ball milling process, expanded graphite was successfully separated into multilayer graphene nanosheets, and spherical TiO2 was successfully bonded to the nanosheets of the multilayer graphene. The 1.0 wt % composite oil was found to provide good friction reduction and wear resistance. It had a film thickness of 27.5 nm, which was 167% thicker than base oil. Due to its excellent dispersion stability, the MGTC nanocomposite exhibited excellent lubrication performance, which was attributed to the formation of carbon protective films, titanium dioxide deposition films, transfer films, and the occurrence of nano ball effects on the surface of friction pairs.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Tribological Performance Analysismentioning

confidence: 97%

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Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

et al. 2022

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“…Friction usually takes place at the contact interfaces when two physical objects move relative to each other and wear is the result of friction [1][2][3]. Wear could lead to deterioration of the contact surface such as vibration, noise, and even failure of mechanical equipment.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the electrical conductivity and tribological properties of NbSe₂-doped lubricating grease

Wu¹,

Yan²,

Cao³

et al. 2022

Mater. Res. Express

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Developing lubricants with good electrical conductivity and good tribological properties is necessary for the power equipment. Here, niobium selenide (NbSe2) and boron nitride (BN) were employed to act as additives to fabricate the lubricating greases with superior electrical conductivity and tribological properties. The lubricating grease containing different concentrations of additives were synthesized and their conductivities were measured by a volume resistance meter at the room temperature of about 25 ℃. The tribological properties of the lubricating greases were also investigated and the worn surfaces were characterized in detail by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy to analyze the lubrication mechanism after friction test. The results showed that NbSe2 could effectively reduce the volume resistivity by ten times as compared with the base grease. Tribological tests showed that when the concentration of NbSe2 was 2 wt%, it could reduce the COF and wear scar width by 23.5% and 12.8% under 150 N and 5 Hz, indicating 2 wt% NbSe2 doped lubricating grease exhibited the outstanding tribological properties. In addition, based on the analysis of the wear surfaces, the superior tribological properties of NbSe2 grease were attributed to the effective lubricating film generated on the friction surface, which played a key role in reducing friction and anti-wear.

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“…Recent studies have shown that ultrafine particles made of metal elements, polymers, organic, and inorganic materials can effectively reduce wear (Shahnazar et al , 2021; Singh et al , 2021). However, commonly lubricating oil additives, such as dithiocarbamate molybdenum (Espejo et al , 2020) and zinc dialkyl dithiophosphate (ZDDP) (Naveira et al , 2011), contain a large amount of sulphur, phosphorus and chlorine, which have an adverse effect on the environment.…”

Section: Introductionmentioning

confidence: 99%

Tribological effect of ZBUP additive on the running-in quality of sliding bearing by fractal analysis

Wang

Zhou

Zuo

2022

ILT

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Purpose The purpose of this paper is to study the tribological effect of zinc borate ultrafine powder (ZBUP) oil additive on the running-in quality. Design/methodology/approach The running-in quality was assessed by friction coefficient and surface topography. Fractal parameters including fractal dimension, the width of multifractal, the multifractal difference, multifractal parameters, phase trajectory and correlation dimension were used to extract the nonlinear characteristics of surface topography and friction coefficient. Findings When the ZBUP additive was added, the convergence degree of the phase trajectory and the stability of the running in were higher than that of base oil. It indicates that the ZBUP additive can improve the running-in quality of sliding bearing. Besides, the ZBUP additive can shorten the running-in time. A boundary protective film, which has good friction-reducing and anti-wear effects, was generated on the surface when the ZBUP additive was added. Originality/value The results have a great significance to improve the running-in quality and prolong the service life of the sliding bearing.

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Properties, functions and applications of commonly used lubricant additives: A review

Cited by 26 publications

References 96 publications

Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

Investigation on the electrical conductivity and tribological properties of NbSe₂-doped lubricating grease

Tribological effect of ZBUP additive on the running-in quality of sliding bearing by fractal analysis

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Properties, functions and applications of commonly used lubricant additives: A review

Cited by 26 publications

References 96 publications

Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO2 Composite Nanolubricant Additive

Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO2 Composite Nanolubricant Additive

Investigation on the electrical conductivity and tribological properties of NbSe2-doped lubricating grease

Tribological effect of ZBUP additive on the running-in quality of sliding bearing by fractal analysis

Contact Info

Product

Resources

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Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

Preparation and Tribological Properties of a Multilayer Graphene-Reinforced TiO₂ Composite Nanolubricant Additive

Investigation on the electrical conductivity and tribological properties of NbSe₂-doped lubricating grease