The adsorption of zinc dialkyldithiophosphates on partially stabilized zirconia from hydrocarbon solution

Margielewski, L.; Stanecka, R.; Partyka, S.; Plaza, S.

doi:10.1007/s11249-005-9003-6

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…All the results are represented as a function of the BET specific surface area of Al 2 O 3 (18 m 2 g )1 ). Details of the adsorption experiments may be found elsewhere [13].…”

Section: Adsorption Measurementsmentioning

confidence: 99%

The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

2006

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The article discusses methods for the deposition of antiwear, composite coatings with a metallic matrix. The Ni-P-Al 2 O 3 composite layers were superimposed on carbon steel elements using the electroless plating technique. A comparative analysis of adsorptive interactions was carried out for model systems with antiwear characteristics, i.e., for the Ni-P matrix, and the composite material containing micro-dispersive corundum, i.e., Ni-P-Al 2 O 3 . The paper presents the results of tribological tests and analyses the effects of tribochemical interactions in the macroscale (using in a pin-on-disc system device) and in the micro/nanoscaleperformed with the use of Atomic Force Microscopy (AFM).

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“…All the results are represented as a function of the BET specific surface area of Al 2 O 3 (18 m 2 g )1 ). Details of the adsorption experiments may be found elsewhere [13].…”

Section: Adsorption Measurementsmentioning

confidence: 99%

The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

2006

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The Application of Polyvinylpyrrolidone as a Modifier of Tribological Properties of Lubricating Greases Based on Linseed Oil

Kozdrach

Skowroński

2018

Journal of Tribology

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The paper presents the research results on the relations between additive content and tribological, rheological, and oxidizing properties of lubricating greases. The greases were based on linseed oil, thickened with amorphous silica Aerosil® and modified with different concentration of polyvinylpyrrolidone. The greases were tested tribologically according to the test on T-02 testing machine and referred to the unmodified control. The evaluation of tribological properties was based on the following parameters: welding load, scuffing load, limiting load of wear, limiting load of scuffing, and limiting pressure of seizure. The results of tribological research revealed the most promising impact of the 3% addition of polyvinylpyrrolidone. All of the crucial parameters were improved in comparison to the unmodified control grease. The spectral analyses revealed that some of the components undergo oxidation during mechanical forces, leading to the formation of the oxidized organic compounds. These substances generated a layer, counteracting the wear of lubricated tribosystem. The improved resistance to oxidation of the tested lubricants with polyvinylpyrrolidone can be explained by the presence of highly hydrophilic pyrrolidone groups and hydrophobic alkyl group in polyvinylpyrrolidone (PVP) molecule. These compounds combine with hydrocarbon chains of linseed oil and act synergistically with the silicon dioxide molecules. The introduction of polyvinylpyrrolidone caused the improvement in dynamic viscosity at lower shear rates and a significant change of viscosity in low temperatures. An increased value of the yield point of the tested lubricating compositions after introduction of the additive was also observed.

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Effect of Thickener Type on Change the Tribological and Rheological Characteristics of Vegetable Lubricants

Kozdrach

2024

Materials

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This paper presents the results of a study on the effect of the dispersed phase on the lubricating and rheological properties of selected lubricant compositions. A vegetable oil base (rapeseed oil) was used to prepare vegetable lubricants, which were then thickened with lithium stearate, calcium stearate, aluminum stearate, amorphous silica, and montmorillonite. Based on the results of the tribological tests of selected lubricating compositions, it was found that calcium stearate and montmorillonite have the most beneficial effect on the anti-wear properties of the tested lubricating greases, while silica thickeners (amorphous silica and montmorillonite) provide the effective anti-wear protection in compared to the lubricants produced on lithium and aluminum stearate. The lowest structural viscosity was found for grease thickened with montmorillonite. Much higher values of this parameter were observed for composition, where aluminum stearate was the dispersed phase, while the highest value of structural viscosity was observed for composition, where aerosol–amorphous silica was the thickener. The composition thickened with amorphous silica had the highest yield point value, while the composition in which montmorillonite was the dispersed phase had the lowest value. Dynamic viscosity decreases with temperature, which is characteristic of lubricants. No significant differences in dynamic viscosity were found for the lubricating compositions tested at temperatures above 50 [°C]. The most favorable rheological properties were observed for composition, which was produced using calcium stearate, as it allows the lowest dynamic viscosity at −20 [°C]. Lubricants produced with lithium stearate or aluminum stearate were characterized by higher viscosity at low temperatures. For grease, in which the lithium stearate was used as a thickener, the value of the elasticity index determines the weak viscoelastic properties of tested grease and a greater tendency to change structure under the influence of applied forces. For vegetable grease thickened with aluminum stearate, more than 15 times lower values of the MSD function were observed, and the calculated elasticity index value proves the stronger viscoelastic properties of the aluminum stearate grease in relation to grease thickened with the lithium stearate. The elasticity index value for grease thickened with amorphous silica was lower than for greases thickened with lithium and aluminum stearate, indicating its stronger viscoelastic properties in relation to these two greases. For grease composition prepared on the vegetable oil base and thickened with montmorillonite. The value of the elasticity index was lower than most of the tested grease compositions, without the composition, in which the calcium stearate was used as a thickener. Such results testify to moderately strong viscoelastic properties, which leads to the conclusion that the produced lubricant was a stable substance on changes in chemical structure under the influence of variable conditions prevailing during work in tribological joints.

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The adsorption of zinc dialkyldithiophosphates on partially stabilized zirconia from hydrocarbon solution

Cited by 3 publications

References 13 publications

The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

The Application of Polyvinylpyrrolidone as a Modifier of Tribological Properties of Lubricating Greases Based on Linseed Oil

Effect of Thickener Type on Change the Tribological and Rheological Characteristics of Vegetable Lubricants

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