Impact of silicate contaminants on tribological and thermal transport performance of greases

Taha‐Tijerina, Jaime; Castaños-Guitrón, Brenda; Peña-Parás, Laura; Tovar-Padilla, Marco; Alvarez-Quintana, J.; Maldonado-Cortés, Demófilo

doi:10.1016/j.wear.2019.01.122

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…In this tribotest, the nanofluids were subjected to a linearly increasing load from 0 to 7200 N, with a rotational speed of 500 rpms for 18 s (Table 2), where 12.7 mm diameter spheres of AISI 52,100 steel with 60 HRC were used [45]. The Institute for Sustainable Technologies -National Research Institute(ITEePib) Polish technique was selected due to the sensitivity to extreme pressure lubricants [1,[46][47][48][49], as well as being less time consuming. In this study, when the frictional torque reached 10 N m, nanofluid seizure occurred and the nanofluid-"protective" film was destroyed; the load at this point corresponded to the seizure load (P oz ).…”

Section: Tribological Experimentationmentioning

confidence: 99%

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

et al. 2020

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Lubricants and fluids are critical for metal-mechanic manufacturing operations as they reduce the friction and wear of tooling and components, and serve as coolants to dissipate the heat generated in these operations. The proper application of these materials improves machine operative life and tooling, and decreases cost, energy, and time consumption for maintenance, damage, repairs, or the need to exchange pieces/components within the machinery. Natural or vegetable-based lubricants have emerged as a substitute for mineral oils, which harm the environment due to their low biodegradability and have negative effects on human health (e.g., causing skin/respiratory diseases). Thus, finding biocompatible and efficient lubricants has become a technology objective for researchers and industry. This study evaluates soybean-, corn-, and sunflower-based lubricants reinforced with silver (Ag) nanostructures by a pulsed laser ablation process. Thermal and tribological evaluations were performed with varying Ag contents, and temperature-dependent behavior was observed. Thermal conductivity improvements were observed for all nanofluids as the temperature and Ag concentration increased (between 15% and 24%). A maximum improvement of 24% at 50 °C and 10 min exposure time of the pulsed laser ablation process for soybean oil was observed. The tribological evaluations showed improvements in the load-carrying capacity of the vegetable oils, i.e., an increase from 6% to 24% compared to conventional materials. The coefficient of friction performance also showed enhancements with Ag concentrations between 4% and 15%.

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Section: Tribological Experimentationmentioning

confidence: 99%

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

et al. 2020

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“…Equations (13) and 14represent the resultant force on a settling particle, and the resultant force must equal to the force due to the acceleration. In the beginning of the settling process, this is also the first period of the two falling stages, the acceleration fall period.…”

Section: Mathematical Analysismentioning

confidence: 99%

“…9 The problems introduced by contaminated lubricant in splash-lubricated gearbox have been well analyzed and studied. 10–16 To eliminate the damage to gearbox internal contacting surfaces and achieve better reliability, it is vitally important to keep the lubricant clean.…”

Section: Introductionmentioning

confidence: 99%

A novel passive filtration system for splash-lubricated gearboxes: Part 1

Yang

Abanteriba

Becker

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Splash-lubricated gearboxes are widely used in many industries. Contaminant removal systems are rarely employed in splash-lubricated gearboxes, such as some gearboxes are used in helicopters and mining machines. The maintenance of lubrication systems in those machines relies on periodic onsite inspection and lubricant change. However, wear debris generated during operation will suspend in lubricant and cause damage to contacting surfaces of gearbox’s components. In this first part of a two-part paper, a novel light-weight passive filtration system that utilises gravitational sedimentation and shape memory alloys is presented for unfiltered splash-lubricated gearboxes. A predictive model is developed for the estimation of flake-like wear particles’ settling behavior in the lubricant. Experiments based on a simplified test rig are also conducted to validate the theoretical results. This mathematical model can also be used to elucidate the impact of sedimentation time of wear particles on the cleanliness of the lubricant after the installation of passive filtration system.

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“…Meanwhile, during the operation of mechanical equipment, there is inevitably water intervention that leads to lubricant contamination, thus forming oil-water two-phase flow lubrication. Research on lubricant water contamination has been reported in the literature, which mainly focuses on the conversion of oil and water fluid phases when water intervenes in the lubricant, the effect on the lubricant viscosity, and the corrosion of mechanical equipment [18]. Oil-water two-phase fluid phase transition refers to a certain condition: water droplets from the dispersed phase into a continuous phase, while the lubricant from the continuous phase into a dispersed phase, so that the fluid from the water-in-oil flow type to the water-in-oil flow type, and the process is not reversible.…”

Section: Introductionmentioning

confidence: 99%

Deterioration mechanism and health status prediction of hydrocarbon lubricants under high temperature and humid environment

Su,

Cao,

Jin

et al. 2024

Preprint

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In practical engineering applications, high temperatures and water ingress seriously affect the service life of hydrocarbon lubricants. In this study, the deterioration process of hydrocarbon lubricants under high temperatures and humid environments was investigated, and a new health state prediction model was proposed. Simulation of hydrocarbon lubricant Polyalpha-olefin (PAO) molecules using the ReaxFF force field to analyse the high temperature thermal oxidation process of lubricants. The rheological properties of oil-water emulsions were determined by observing the morphology of oil-water two-phase mixtures with different water contents. A multiparameter fusion viscosity prediction model was proposed using a linear model of the viscosity of aqueous fluids as affected by temperature and water content fitted with the Andrade viscosity-temperature equation to predict lubricant viscosity changes under multiple parameters. On-line validation tests were carried out on a compound planetary transmission system, and the surface topographical parameters of the transmission components were further discussed. The experimental results show that the linear correlation with the improved lubricant viscosity prediction model is 0.966, and the surface wear of transmission components is consistent with the trend of lubricant quality change. These findings provide a fundamental basis for the assessment of lubricant service life in high temperatures and humid environments.

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Impact of silicate contaminants on tribological and thermal transport performance of greases

Cited by 12 publications

References 27 publications

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

A novel passive filtration system for splash-lubricated gearboxes: Part 1

Deterioration mechanism and health status prediction of hydrocarbon lubricants under high temperature and humid environment

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