Augmenting the lubrication performance of nano-oils through synergistic co-functioning of nanoparticles

Saini, Vinay; Bijwe, Jayashree; Seth, Sarita; Ramakumar, S.S.V.

doi:10.1016/j.triboint.2023.108332

Cited by 8 publications

(7 citation statements)

References 38 publications

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“…Representative SEM images were selected to examine the worn areas and infer the micro-wear mechanisms (Figure 6). Based on the SEM micrographs (Figure 6) and the tribological conditions imposed (boundary/mixed regime), it can be deduced that a tribochemical film was formed in all cases due to lubricated contact between the surfaces, as obtained in previous studies [1,5,[32][33][34][35]. Within this regime, friction and wear control primarily occur through films generated by chemical and physical interactions between the additives and the surfaces of the moving bodies, known as tribofilms [4].…”

Section: Tribological Characterizationsupporting

confidence: 58%

“…Studies by Saini et al [35] and Azam et al [32] have shown that the presence of tribofilm increased the lubricant film thickness (and thus λ) and also improved the lubrication regime by facilitating the entrainment of more lubricant within the contact area. This could explain why the tribofilm formed by m5W-30 reduced the contact severity at 40 • C compared to the tribofilm formed by 5W-30 oil.…”

Section: Effect Of the Metal Conditioner In The Tribological Properti...mentioning

confidence: 99%

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Effect of a Metal Conditioner on the Physicochemical Properties and Tribological Performance of the Engine Oil SAE 5W-30 API SN

Calabokis

Rosa

Ballesteros-Ballesteros

et al. 2023

Lubricants

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Metal conditioners (MC) are added to lubricants to enhance their friction and wear in friction pairs, mainly in engines, gearboxes, and rolling bearings. Its growth in the Brazilian market is primarily focused on internal combustion engines. The effect of mixing MC with commercial engine oil (SAE 5W-30 API SN) was studied regarding the rheological and thermal properties. Also, the tribological performance of steel–steel contact was investigated. The rheological and thermal properties were determined by flow curves (at 20, 40, and 100 °C) and differential scanning calorimetry (DSC), respectively. Reciprocating fully-lubricated tests were performed at 40 °C and 80 °C (Po = 1.7 GPa, 5 Hz). Differences in the chemical composition between SAE 5W-30 and its mixture with MC were identified by infrared spectroscopy and related to their tribological performance. The coefficient of friction remained within the range of 0.09–0.1 for all conditions, typical of lubricated steel–steel contacts under boundary and mixed lubrication regimes. However, the mixture improved the wear resistance by around 33% when lubricated at 80 °C compared to the wear resistance offered by 5W-30. The formation of tribofilms with different chemical compositions was confirmed by SEM-EDS for all conditions. At both temperatures, the tribological performance reveals beneficial synergy between the metal conditioner and fully formulated oil additives. The tests lubricated with the mixture at 40 °C showed a less severe wear mechanism when compared to the tests lubricated with neat 5W-30. The study demonstrated that the mixture maintained the physicochemical properties of the commercial oil with a substantial anti-wear action at 80 °C.

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Section: Tribological Characterizationsupporting

confidence: 58%

Section: Effect Of the Metal Conditioner In The Tribological Properti...mentioning

confidence: 99%

Effect of a Metal Conditioner on the Physicochemical Properties and Tribological Performance of the Engine Oil SAE 5W-30 API SN

Calabokis

Rosa

Ballesteros-Ballesteros

et al. 2023

Lubricants

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“…Another study includes Titanium, MoDTC and different nanoparticles to improve the lubricating potential of PTFE nano-oils. The largest synergistic effects with PTFE nanoparticles were achieved with just 1% MoDTC, increasing weld loads from 560 to 700 kg and performance by 25% (Saini et al , 2023).…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer additives on the tribological performance of soybean oil

Guru,

Venugopal,

Sarangi

2023

ILT

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Purpose This study aims to investigate the behavior of vegetable oil with two additives. Base oil’s tribological qualities can be improved with the help of several additions. In the present investigation, soybean oil is served as the foundational oil due to its eco-friendliness and status as a vegetable oil with two additives, named polytetrafluoroethylene (PTFE) and molybdenum disulfide (MoS2). Design/methodology/approach As additives, PTFE and MoS2 are used; PTFE is renowned for its anti-friction (AF) properties, while MoS2 is a solid lubricant with anti-wear (AW) properties. This investigation examines the synergistic impact of AF and AW additions in vegetable oil. The lubricity of the base oil is measured by using a four-ball tester, and the wear properties of the oil at different additive amounts are determined by using a universal tribometer. Findings PTFE (at 5 Wt.%) and MoS2 (at 1 Wt.%) were found to improve the tribological performance of the base oil. The weld load is significantly increased when 5 Wt.% of PTFE + MoS2 is added to the base oil. Originality/value A better tribological characteristic can be achieved by combining additives that amount to less than 1% of the base oil. In experiments with highly concentrated MoS2, the adequate pressure improved dramatically, but the lubricant’s tribological characteristics did not. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2022-0321/

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“…The evaluation of the tribological characteristics of various lubricants, both liquid and plastic, with the addition of nanoparticles, where the main tool is a four-ball tribometer, was described in [14][15][16][17][18][19][20][21]. The tribological properties of SiO 2 nanoparticles used as additives to a base oil were studied in [15].…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles, specifically activated carbon, in lithium grease, were discussed in [19,20], while hybrid nano-oils were studied in [21,22]. The possibility of using nanoparticles and polytetrafluoroethylene simultaneously was considered by the authors of [23].…”

Section: Introductionmentioning

confidence: 99%

A Methodological Approach to Assessing the Tribological Properties of Lubricants Using a Four-Ball Tribometer

Al-Quraan,

Alfaqs,

Haddad

et al. 2023

Lubricants

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Based on the analysis of standards for the testing of lubricants, both liquid and plastic, on a four-ball tribometer, and the analysis of the parameters by which lubricants are evaluated, this paper proposes a methodology and an integral parameter for the estimation of tribological properties. The methodological approach proposed in this paper allows for the integration of a variety of parameters provided in the standards for the testing of lubricants into one indicator. Herein, we show that the developed technique is based on the energy approach and takes into account the specific wear work of the test material (steel balls) in the lubricating medium to be investigated. The results of laboratory tests of a wide range of lubricants are presented: hydraulic fluids, motor and transmission oils of various purposes and classifications. It is shown that the magnitude of the integral parameter can be used to assess the effectiveness of anti-wear and anti-scuff additives in base lubricants, as well as the ranges of their applications. This allows for differentiation and quantitative evaluation of the effectiveness of such additives. The obtained results allow us to state that all tests according to the developed method are reproducible and homogeneous, which is confirmed using the Cochran criterion. The coefficient of variation during testing does not exceed 18%. We show that the presented methodology and the integral parameter can be used in the first stage of the laboratory selection tests of new lubricants and additives of various origins, reducing the costs of their development and implementation.

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Augmenting the lubrication performance of nano-oils through synergistic co-functioning of nanoparticles

Cited by 8 publications

References 38 publications

Effect of a Metal Conditioner on the Physicochemical Properties and Tribological Performance of the Engine Oil SAE 5W-30 API SN

Effect of a Metal Conditioner on the Physicochemical Properties and Tribological Performance of the Engine Oil SAE 5W-30 API SN

Effect of polymer additives on the tribological performance of soybean oil

A Methodological Approach to Assessing the Tribological Properties of Lubricants Using a Four-Ball Tribometer

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