Studying colloidal greases with hard nanoparticles of aluminum silicates used to reduce wear of steel friction pairs

Alisin, V. V.; Pokidko, B. V.; Roshchin, M. N.; Silova, T. V.; Симакова, Г. А.

doi:10.3103/s1068366613060020

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…The authors of work [3] emphasize that the lubrication activity of layers of adsorptional origin is mainly influenced by the orientation degree of molecules of lubrication compositions active components close to friction surfaces. The analysis of the given facts allows to conclude that the determining role in different lubrication modes can belong both to hydrodynamic conditions of the shear flow and orientation order of lubrication layers in surface forces field [4].…”

Section: Introductionmentioning

confidence: 98%

On Prediction of Tribotechnical Characteristics of Lubricants Using Polarization Tribometry Method

Zheleznov¹,

Godlevskiy²,

Березина³

et al. 2017

Liq. Cryst. and their Appl.

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Section: Introductionmentioning

confidence: 98%

On Prediction of Tribotechnical Characteristics of Lubricants Using Polarization Tribometry Method

Zheleznov¹,

Godlevskiy²,

Березина³

et al. 2017

Liq. Cryst. and their Appl.

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“…It is noted in [3] that the lubricating effect of the adsorption layers is determined primarily by the orientation of the lubricant molecules with respect to the friction surfaces. Thus, we should conclude that both the surface and shear flow play a decisive role in the structural ordering of the lubricant in different modes of lubrication [4].…”

Section: Introductionmentioning

confidence: 99%

An in situ study of lubricant layer morphology

Zheleznov

Березина

Godlevsky³

2015

J. Frict. Wear

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For the ordered phases of the mesomorphous lubricant layer to be identified, a quantitative method based on the models of epitropic liquid crystal layers for an infinitely high and finite constant viscosity has been developed. A polarizing tribometer was used for the experimental verification of the theoretical results. The experimental approach is based on the measurement of plane polarized laser light transmitted through the lubricating layer under the steady state shear flow conditions.

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“…It is known that nanosized carbon materials like nanotubes [4][5][6], graphene [7,8], nanodiamonds [9][10][11], metal nanoparticles, and its oxides [12][13][14][15][16][17] are widely used as fillers for greases. Some metal containing and boron compounds can also be used [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Functional Additives Application in the Low Temperature Greases

et al. 2021

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Due to the fact that the application of AW and EP additives in low-temperature greases may lead to worse high-temperature and anti-corrosion characteristics as well as additional burden on the environment due to the content of aggressive components, in this paper, the possibility of replacing these additives with NFA, which do not have these disadvantages, was investigated. The analysis of nanosized particles being used as functional additives in greases was carried out. The morphology of the following nanoparticles was studied: montmorillonite K 10, silica, calcium car-bonate and borate, halloysite, and molybdenum disulfide incorporated in halloysite tubes. The effect of nanostructured components on the physicochemical characteristics and anti-wear and anti-scuffing properties of complex lithium, polyurea, and polymer greases were studied. Maximal improvement of anti-wear and anti-scuffing characteristics of cLi-greases was reached when using silica and calcium borate. Maximal improvement of anti-scuffing properties of PU-lubricant was reached when using calcium carbonate and the two-component NFA based on halloysite, for anti-wear properties when adding silicon dioxide and halloysite. When the concentrations of silicon dioxide and calcium carbonate was increased from 1 to 3 wt.%, there was a decrease in yield stress of the structural frame of the PU-lubricant and its colloidal stability was worse. The increase of the concentration of calcium carbonate and borate nanoparticles in the studied range led to a significant improvement of the anti-wear and anti-scuffing characteristics of the PU grease, respectively. The greases properties’ dependence from the nanostructured functional additives’ introduction method and their concentration were investigated. Nanoparticles were added into the test lubricants before and after the thermo-mechanical dispersion stage. The addition of silicon dioxide and calcium carbonate NFA after the heat treatment stage led to worsening of the characteristics of the plastic material, and the increase of their concentration from 1 to 3 wt.% formed a harder structure of Li-grease. On the contrary, the addition of calcium borate NFA is recommended after the thermomechanical dispersion. The choice of nanoparticles and the method of their addition to the lubricants of various types was carried out according to the results of the previous stage of the research. Along with the analysis of the physicochemical characteristics and anti-wear and anti-scuffing properties of the lubricants, the structure of the dispersion phase of nanomodified lubricants were studied.

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Studying colloidal greases with hard nanoparticles of aluminum silicates used to reduce wear of steel friction pairs

Cited by 6 publications

References 3 publications

On Prediction of Tribotechnical Characteristics of Lubricants Using Polarization Tribometry Method

On Prediction of Tribotechnical Characteristics of Lubricants Using Polarization Tribometry Method

An in situ study of lubricant layer morphology

Nanoscale Functional Additives Application in the Low Temperature Greases

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