A review of the influence of environmental humidity and water on friction, lubrication and wear

Lancaster, J.K.

doi:10.1016/0301-679x(90)90053-r

Cited by 419 publications

(179 citation statements)

References 69 publications

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“…In all samples, an increase in water content produces an increase in wear scar. The presence of water prevents the formation of the third body debris layer on the metal surface [31] and thus adhesive wear is not likely to occur to the same extent. According to [32], this third body layer is often composed of partieles detached from the rubbing surfaces which separate the surfaces in contact, avoiding direct interactions.…”

mentioning

confidence: 99%

Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Lapuerta

Sánchez-Valdepeñas

Bolonio

et al. 2016

Fuel

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Lubricity of individual fatty acid methyl or ethyl esters and biodiesel fuels has been measured using a high frequency reciprocating rig (HFRR). Tests have been carried out varying the ambient humidity to assess the effect of this parameter on the lubricity of the fuels. The European standard proposes a single humidity correction factor for al! the fuels, regardless their composition. lt has been proved in this study that this factor is not constant and it depends on the fu el composition. For this reason two different correlations have been proposed for the estimation of the humidity correction factor and normalized wear scar as a function of different fuel compositional characteristics. The infiuence of the water content on the lubricity and the relationship between humidity and water content ofthe fuel has been studied revealing that the effect of the air humidity is an indirect effect of the hygroscopy of the fue!.

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mentioning

confidence: 99%

Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Lapuerta

Sánchez-Valdepeñas

Bolonio

et al. 2016

Fuel

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“…Under normal environmental conditions of humidity (20 ºC/ 30 % RH) the coefficient of friction of graphites is low (0.1 to 0.3) [4,5,6]. The basal planes are preferably and substantially oriented parallel to the surface.…”

Section: Introductionmentioning

confidence: 99%

“…The basal planes are preferably and substantially oriented parallel to the surface. Carbon materials and graphites are low surface energy solids and when they are exposed to each other damages can occur, dangling bonds, into the basal plane, and as a consequence, higher surface energy regions are exposed resulting in enhanced surface adhesion [5,6,7]. The friction and wear are reduced if these regions are neutralized by the action of active gases such as water vapor.…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of a third body and the moisture form a lubricating film by physical adsorption phenomena. This effect decreases the interaction between the contact faces, reducing the adhesion between them and consequently, results in a decrease in the friction coefficient [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The graphite tribological behavior has been the focus of many studies on its performance as lubricant in different conditions of controlled atmosphere [4,5,6,7]. In environments with presence of active gases, such as oxygen or water vapor, the coefficient of friction results in values between 0.1 and 0.3.…”

Section: Introductionmentioning

confidence: 99%

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Influence of basal plane domains in the tribological behavior of graphites

Souza

Pardini

2016

Matéria (Rio J.)

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Many dynamic engineering systems have interferences and interactions that causes wear under friction effect. Carbonaceous materials, such as polycrystalline graphites, are of great interest in engineering systems due to their inherent lubricant properties and their versatility as a material for applications in the areas of mechanics, transportation, energy systems and sensitive technologies. In this work the tribological behavior of three identical pairs, pin-on-disc, of commercial polycrystalline graphites were evaluated, in a controlled environment at 20 °C and 50 % RH. Results of tribological behavior were correlated considering the prevalence of basal plane, identified by polarized light optical microscopy, as a function of the tribological behavior, measured by tests with pin on disc tribometer. The results showed that the coefficient of friction behavior is directly related to the basal plane mosaic domain and the extension of the damage generated on this plane due to the contact between the tribological pair. The materials studied presented an increase in the friction coefficient values, 0,10; 0;13 and 0,23 with increasing area of the basal plane mosaic domain, respectively 55; 64 and 81% respectively.

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Third‐Body Reality – Consequences and Use of the Third‐Body Concept to Solve Friction and Wear Problems

Berthier¹

2005

Wear – Materials, Mechanisms and Practice

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A review of the influence of environmental humidity and water on friction, lubrication and wear

Cited by 419 publications

References 69 publications

Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Influence of basal plane domains in the tribological behavior of graphites

Third‐Body Reality – Consequences and Use of the Third‐Body Concept to Solve Friction and Wear Problems

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