Effect of Some Physical and Chemical Properties of Lubricants on Boundary Lubrication

Klaus, E. E.; Bieber, Herman

doi:10.1080/05698196408972030

Cited by 57 publications

(12 citation statements)

References 13 publications

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“…As noted by previous investigators (4,5), there were two effects of oxygen concentration. Under conditions of " effective" lubrication, characterized by the absence of seizure , there was a gradual reduction in wear with decreasing oxygen.…”

Section: A Effect Of Hydrocarbon Structurementioning

confidence: 58%

Chemistry of Boundary Lubrication of Steel by Hydrocarbons

Fein¹,

Kreuz²

1965

A S L E Transactions

106

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B oundary lubrication by hydrocarbon s was explored by usin g a four-ball mach ine with 52100 steel specimens at 0.35 em per second slidin g veloci ty. The chemi cal type of the hydrocarbon and the am ount of oxyge n dissolved in it appeared important. Low molecular wei ght liquid aromatic hydrocarbons exposed to ambient air w ere found as effective as straight mineral oils in controlling wear , while saturated hydro carbons usually w ere markedly poorer . Benz ene and cycloh exane were used as m odel lubri cant s in the study of oxyg en concentration in vapor and liquid phase. Both high and low oxyge n-to-hydrocarbon ratios favored high wear and inor ganic wear products. Certain in term ediat e rati os favored low wear and the formation of an oxy genated organic "friction poly m er" w hich prevent ed metallic cont act. Re sults are discussed in the light of kno wl edge concerni ng catalyt ic reactions at clean metal sur faces.

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Section: A Effect Of Hydrocarbon Structurementioning

confidence: 58%

Chemistry of Boundary Lubrication of Steel by Hydrocarbons

Fein¹,

Kreuz²

1965

A S L E Transactions

106

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“…The transition between sufficient corrosion to generate protective films and adhesive wear is present in most systems [10]. The transition is dependent on load since, as the load is increased, more asperities from opposing surfaces make contact at any given moment so that the average time between successive contacts for any single asperity is reduced.…”

Section: Lubricant Reactivitymentioning

confidence: 99%

“…The classic evidence of the transition between corrosive and adhesive wear is provided by experiments involving steel contacts lubricated by oil containing various concentrations of dissolved oxygen [10]. In the tests conducted in a four-ball machine it was found that the wear rate was reduced as oxygen concentration was lowered until a critical point was reached at which the wear rate sharply increased.…”

Section: Lubricant Reactivitymentioning

confidence: 99%

Corrosive and Oxidative Wear

2014

Engineering Tribology

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“…T h e bounclary lubrication 1)roccss cColllprises these reactions that take place among the lubricant components o r bet\veen the 1~1bricant components a n d the metal bearing surface. It has been shown for saturated hydrocarbon lubricants (nonreactive lubricants) that dissolved oxygen, from the air above the lubricant, is an effective lubrication additive (3). It has also been demonstrated that the addition of an effective lubricity additive such as an alkyl acid phosphate will dominate the apparent chemical activity between the lubricant and the bearing surface (4).…”

Section: Introductionmentioning

confidence: 98%