Studies and researches concerning the tribological behaviour of friction couple functioning with selective transfer

Ilie, Filip

doi:10.1016/j.triboint.2005.07.006

Cited by 17 publications

(9 citation statements)

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“…As compared with the usual conditions of loading and lubrication, the appearance of a thin cop per film considerably reduces losses to friction and increases the wear resistance of friction surfaces. In publications, there exists an opinion that the layer forming on friction surfaces has a porous heterogenic structure, which is verified by investigations [16,17]. However, the investigations carried out with the use of a Phenom ProX microscope allow one to conclude that the layer has a rather sponge capillary structure (Fig.…”

Section: Resultsmentioning

confidence: 87%

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Studying the surface layers of products using a low-vacuum scanning electron microscope

Feldshtein

Kowalewski

Dyachkova

2014

J. Synch. Investig.

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The results of studying parameters of the surface layer after the tribological testing of different materials using a low vacuum Phenom ProX scanning electron microscope are presented. It is shown that its use for the analysis of surface layers provides a very accurate estimate of their main parameters, i.e., volume topography and chemical composition for an insignificant (several seconds) sample setup time. The results of analysis of worn surfaces of FeGr1Cu19Sn0.9(MoS2)0.5 powder steels obtained by sintering and infiltration of a copper alloy, oxidized aluminum alloy AlCu4MgSi, and Vitalium Co-Cr-Mo alloy used for dental pros theses are presented as examples.

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Section: Resultsmentioning

confidence: 87%

“…In the last few years, some investigators have presented experimental results on the process of selective mass transfer [16][17][18][19]. It has been established that the process of selective mass transfer takes place only during the course of friction.…”

Section: Resultsmentioning

confidence: 99%

Studying the surface layers of products using a low-vacuum scanning electron microscope

Feldshtein

Kowalewski

Dyachkova

2014

J. Synch. Investig.

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“…At this point, interest of Western tribologists in these ideas was negligible mainly due to ambiguous definition of the selective transfer mechanism and also low access to Russian literature. More recently, Padgurskas [10] and Ilie [11] published papers on this matter in 2006.…”

Section: Superlubricity and Lubrication By Glycerolmentioning

confidence: 99%

Anomalous Low Friction Under Boundary Lubrication of Steel Surfaces by Polyols

et al. 2008

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We present here anomalous low friction obtained with highly polished steel on steel hard contact lubricated by glycerol under severe mixed and boundary regimes (k ratio below 1). We investigated the effects of contact pressure, sliding speed, and temperature on friction coefficient and electrical contact resistance. The mechanism of low friction (typically below 0.02) is thought to have two origins: first a contribution of an ultrathin EHL film of glycerol providing easy shear under pressure, second the chemical degradation of glycerol inside the contact when more severe conditions are attained, generating a nanometer-thick film containing shear-induced water molecules. This new mechanism, called ''H-bond Network model'', is completely different from the well-accepted ''Monolayer'' model working with polar molecules containing long aliphatic chains. Moreover, we show outstanding superlubricity (friction coefficient below 0.01) of steel surfaces directly lubricated by a solution of myoinositol (also called vitamin Bh) in glycerol at ambient temperature (25°C) and high contact pressure (0.8 GPa) in the absence of any long chain polar molecules. Mechanism is still unknown but could be associated with frictioninduced dissociation of inositol and H-bond interactions network of water-like species with steel surface.

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“…A couple of materials that best meet these requirements are the bronze/steel couple lubricated with technical glycerin because this lubricant realizing much more easily than other lubricants the selective transfer regime. 4,5…”

Section: Forming Mechanism Of the Selective Layer (Servowitte)mentioning

confidence: 99%

Rheological behavior of the lubricants favoring the formation of thin layers by selective transfer in the frictional couples

Ilie

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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During the friction process of certain materials and in the presence of some adequate lubricants (technical glycerin), the wear phenomenon manifests as a material transfer from an element of a frictional couple on the other, in the contact areas (forming a selective layer), and therefore, can function in conditions of selective transfer. This phenomenon lasts until it reaches an optimal thickness, and after that, the transferred layer may return totally or partially to the initial element. In the contact points of the frictional couples that function with the selective transfer, several physical–chemical processes take place that favor the phenomenon. An important role in the functioning of the frictional couples with a selective transfer is rheological behavior that it has the lubricant. This paper analyzes the behavior and some of the rheological properties of the technical glycerin in the frictional couples what functioning with the selective transfer, technical glycerin being the lubricant that contributes sure, to the triggering of this phenomenon.

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Studies and researches concerning the tribological behaviour of friction couple functioning with selective transfer

Cited by 17 publications

References 1 publication

Studying the surface layers of products using a low-vacuum scanning electron microscope

Studying the surface layers of products using a low-vacuum scanning electron microscope

Anomalous Low Friction Under Boundary Lubrication of Steel Surfaces by Polyols

Rheological behavior of the lubricants favoring the formation of thin layers by selective transfer in the frictional couples

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