The influence of bearing grease composition on friction in rolling/sliding concentrated contacts

Laurentis, N. De; Kadiric, Amir; Lugt, Piet M.; Cann, P. M.

doi:10.1016/j.triboint.2015.10.012

Cited by 120 publications

(101 citation statements)

References 24 publications

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“…The results revealed very different friction trends between the greases, as evident in Fig. 1 reproduced from the same work [19]. The most effective 'low-friction' formulation in that investigation was a specific lithium-thickened PAO grease, denoted in that work as LiPAO.…”

Section: Introductionmentioning

confidence: 60%

“…PAO was chosen as the most suitable oil type for this investigation, due to its definite and consistent composition [26], with consequent improvements in repeatability of the results and validity of the described comparisons. In addition, the use of PAO allowed for a direct comparison between these custom greases and the commercial LiPAO grease, studied in the previous work by the authors [19], which is formulated with the same type of thickener and base oil. Five PAObased greases were fabricated with PAOs of different viscosities.…”

Section: Grease Formulations and Manufacturing Of Test Samplesmentioning

confidence: 99%

“…In particular, studies employing a ball-on-disc setup, which simulates one of the concentrated contacts in a rolling bearing, have generally agreed that in grease lubrication there exist two operating 'regions' in terms of both friction and film thickness behaviour: a 'low-speed' region where the thickener clearly contributes significantly to the lubrication process, and a 'high-speed' region where the oil properties are more important [19][20][21][22]. However, of these studies only a few have been methodical in terms of carefully isolating each variable in the grease formulation so that its individual influence on the overall grease tribological behaviour could be investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous, related work by the present authors [19], the frictional behaviour of a series of fully formulated, commercially available greases was studied on ball-on-disc tribometers, with the aim of shedding some light on to the effect of grease composition on friction in concentrated contacts. The selection of greases purposely included formulations with different thickener types, and base oil types and viscosities.…”

Section: Introductionmentioning

confidence: 99%

“…These two variables were isolated by comparing greases made with the same type of base oil (PAO and mineral) but different viscosities, or with different oil types (PAO, mixed PAO/ester and mineral) but with similar viscosities. Lithium 12-hydroxystearate, which in the previous study showed low-friction properties in the 'lowspeed' region [19], was used as the thickener, with fixed concentration, for all the greases studied in this paper. The effect of friction modifiers was investigated separately, by additising selected greases and base oils with oleic acid.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts

et al. 2017

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This study investigates the influence of base oil type and viscosity on the frictional behaviour of lithiumthickened bearing greases. A series of model lithium greases were manufactured by systematically varying viscosity and type of base oil, so that the influence of a single base oil property could be studied in isolation. In addition, selected greases were blended with oleic acid, with the purpose of evaluating its effectiveness in further reducing grease friction. Friction coefficient and film thickness were measured in laboratory ball-on-disc tribometers over a range of speeds and temperatures. For a specific oil type, the influence of base oil viscosity on friction was found to be closely related to its effect on film thickness: greases formulated with PAO oils covering a wide range of viscosities gave very similar friction at the same nominal film thickness. For a given base oil viscosity, base oil type was found to have a strong influence on grease friction under all test conditions. PAO-based greases generally produced lower friction than mineral-and ester-based greases. Addition of oleic acid to the test greases did not significantly affect friction within the range of test conditions employed in this study. The results provide new insight into the frictional behaviour of greases, which may be used to help inform new low-friction grease formulations for rolling bearing applications.

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Section: Introductionmentioning

confidence: 60%

Section: Grease Formulations and Manufacturing Of Test Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts

et al. 2017

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Magnetorheological Elastomer‐Based Materials and Devices: State of the Art and Future Perspectives

et al. 2021

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Magnetorheological elastomers based on the combination of a polymeric matrix with magnetic fillers allow the possibility of controlling their mechanical properties when an external magnetic field is applied. This so‐called magnetorheological effect can be exploited for a variety of applications. Herein, a comprehensive outlook at the state of the art is provided, in terms of the materials, effects, and applications. The physical effects that result in the magnetorheological effect are described, both from a micro and phenomenological points of view. Then, the possible combinations of different polymeric matrices and magnetic fillers, along with other additives, are presented, allowing to tune the mechanical properties, mainly dependent on the polymer matrix, and the magnetic field response, which is related to the magnetic filler. Finally, representative applications of magnetorheological elastomers are presented. This review represents an up‐to‐date state‐of‐the‐art in the field of magnetorheological elastomers as a ground to highlight the main achievements and point the specific needs to improve their response and applicability by further tuning materials and configurations.

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Influence of grease formulation parameters on the tribological property of rice bran oil based lubricating grease

Thampi

Alokkan

Biju

et al. 2021

J Americ Oil Chem Soc

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The negative environmental impacts and depletion of resources caused due to the excess usage of petroleum based products made researchers to think about an alternative biodegradable product. In the present study, rice bran oil (RBO) was used as a base oil for formulating 16 different grease samples. The thickener used was generated in situ by mixing 12-hydroxy stearic acid (12 HSA) to calcium hydroxide at a different ratio from 1.25 to 2. The formulation parameters such as weight % of thickener, saponification time, and maximum temperature spanned the ranges 5-11 wt.%, 1-2.5 h, and 150-180 C, respectively. The tribological properties such as wear scar diameter (WSD) and friction of 16 different grease samples formulated by varying these parameters were evaluated using a standard four-ball tester as per ASTM standards. The grease samples were characterized by evaluating the penetration value using a standard cone penetrometer. The influence of these formulation parameters on the experimentally evaluated properties was also examined in this work. The results indicated that the variation of these parameters during grease formulation has a significant influence on the evaluated properties.

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The influence of bearing grease composition on friction in rolling/sliding concentrated contacts

Cited by 120 publications

References 24 publications

The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts

The Influence of Base Oil Properties on the Friction Behaviour of Lithium Greases in Rolling/Sliding Concentrated Contacts

Magnetorheological Elastomer‐Based Materials and Devices: State of the Art and Future Perspectives

Influence of grease formulation parameters on the tribological property of rice bran oil based lubricating grease

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