Application of magnetic fluids in tribotechnical systems

Uhlmann, E.; Spur, Günter; Bayat, Nayim; Patzwald, Reiner

doi:10.1016/s0304-8853(02)00724-2

Cited by 70 publications

(45 citation statements)

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“…The main advantage of FF as a lubricant, over the conventional oil, is that the former can be retained at the desired location by an external magnetic field and still possess flowability of fluid at the same time. Further advantages are the small amount of the necessary lubricant and the avoidance of leakages [6] because the lubricant is prevented from leaving the contact zone. Moreover, when subjected to an external magnetic field, the viscosity of the lubricant will increase and, hence, its load capacity will be improved.…”

Section: Introductionmentioning

confidence: 99%

Study on the Ferrofluid Lubrication with an External Magnetic Field

et al. 2010

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Ferrofluids (FFs) are stable colloidal systems consisting of single-domain magnetic particles with a diameter of approximately 10 nm coated with surfactants and dispersed in a carrier liquid. By applying an external magnetic field, these fluids can be confined, positioned, shaped and, controlled at desired places. The load capacity of a lubricant film of FF can also be increased with an appropriate magnetic field. In this paper, Fe 3 O 4 -based FFs with different saturation magnetizations (M s ) were prepared by the co-precipitation technique. The tribological experiments of FFs under different magnets distributions were conducted on a ring-on-cylinder tribometer. The results show that the magnetic field intensity distributions on the rubbing surface have a significant influence on the tribological properties of FFs. The experimental results also indicate that FFs have a good friction-reduction performance in the presence of an external magnetic field compared with the carrier liquid and that its lifetime of friction can be greatly improved.

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Section: Introductionmentioning

confidence: 99%

Study on the Ferrofluid Lubrication with an External Magnetic Field

et al. 2010

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“…Magnetic particles remain stable and can be evenly distributed in the base fluid under the cover of the surfactant [6]. Ferrofluids are widely used in the areas of sealing, lubrication, grinding, speakers, and shock absorbers [7][8][9][10][11]. In recent years, it has begun to be applied in the fields of sensors and microflow controlling [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Suppressing High Frequency Self-Excited Noises of Armature Assembly in a Torque Motor Using Ferrofluid

Han

Guo

et al. 2017

Shock and Vibration

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Attempting to suppress high frequency self-excited noises of armature assembly, ferrofluid is added to the working clearances of torque motor. The mathematical model of resistance force of ferrofluid applied to armature is derived theoretically from parallel plate squeeze flow theory and ferrofluid constitutive model in which shear thickening and shear thinning effects are taken into account. Then the equivalent physical model of ferrofluid is established according to the resistance force, and, through analysis, it can be further simplified as viscous damping model. Finally, the suppressing effect introduced by ferrofluid on high frequency noises of armature assembly is verified by comparing the results of numerical simulation with ferrofluid and that without ferrofluid.

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“…Further, with a designed magnetic field, lubricant is prevented from leaking and polluting the environment . Moreover, when subjected to an external magnetic field, viscosity of the lubricant will increase, and hence, its load capacity will be improved . The magnetic particles used in the carrier are much finer than the surface roughness, and they do not cause any wear on the rubbing surface .…”

Section: Introductionmentioning

confidence: 99%

Ferrofluids lubrication: a status report

Huang

Wang

2015

Lubrication Science

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Ferrofluids (FFs) are stable colloidal suspensions composed of single‐domain magnetic nanoparticles dispersed in a carrier liquid. And it is an intelligent material, exhibiting normal liquid behaviour coupled with superparamagnetic properties. Since the properties and the location of these fluids can easily be influenced by a magnetic field, FFs have recently attracted many scientific, industrial and commercial applications. Lubrication is one of the most important applications for FFs, and the advantage of FFs as lubricant, over the conventional ones, is that the former can be retained at the desired location with moderate magnetic fields. The main focus of this paper is to present a comprehensive review on FFs lubrication theories based on the three flow models of Neuringer–Rosensweig, Shliomis and Jenkins. Besides, a few experimental studies on FFs lubrication are discussed briefly. Copyright © 2015 John Wiley & Sons, Ltd.

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Application of magnetic fluids in tribotechnical systems

Cited by 70 publications

References 1 publication

Study on the Ferrofluid Lubrication with an External Magnetic Field

Study on the Ferrofluid Lubrication with an External Magnetic Field

Numerical Investigation on Suppressing High Frequency Self-Excited Noises of Armature Assembly in a Torque Motor Using Ferrofluid

Ferrofluids lubrication: a status report

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