The influence of cavitational synthesis nanodiamonds on the tribological properties of a water-oil-based cooling lubricant


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Abstract

This paper deals with the study of the influence of nanosized diamonds produced by the cavitational synthesis method on the tribological properties of a commercial water-oil-based cooling lubricant. The study is aimed at assessing the prospects for application of this type of nanodiamonds as an antifriction and antiwear additive. Tribological tests were carried out using the “indenter on a disk” friction scheme at a constant load and sliding speed. High-speed P18 steel for the indenter and 30HGSA steel for the rotating counterbody (disk) were used as friction couple materials. The studies were carried out for the base lubricant and two variants of its composition modifications using colloidal dispersion (distilled water with dispersed nanodiamonds) with a final additive concentration of 0.5 and 2.5 %. It was experimentally found that both variants of modification of the base water-oil emulsion resulted in increase of the bearing capacity of lubricating layers, decreasing the total linear wear of friction couple elements by 1.8–2.4 times. The presence of nanodiamonds in the composition enhanced as well the shielding effect of the cutting coolant. A decrease in visible damage to friction surfaces was recorded using optical microscopy. Analysis of profile diagrams of worn areas in the transverse direction showed a decrease in the size of a groove on the counterbody against the background of a decrease in roughness from Ra=0.49 μm in the basic variant to Ra=0.29–0.34 μm. Evaluation of the loss in counterbody weight for nanodiamond concentrations of 0.5 and 2.5 % showed a decrease in their value by 1.3 and 1.9 times, respectively; for the indenter, the decrease in this parameter was 1.2 and 1.5 times. Thus, the use of cavitational synthesis nanodiamonds as an additive may become a promising direction for increasing the antiwear properties of water-oil-based cooling lubricants.

About the authors

Evgeny V. Fominov

Don State Technical University

Author for correspondence.
Email: fominoff83@mail.ru
ORCID iD: 0000-0002-0165-7536

PhD (Engineering), Associate Professor

Россия, 344010, Russia, Rostov-on-Don, Gagarin Square, 1

Maksim V. Kovtun

Trading and Industrial Company SYNTEZ

Email: 79185530688@ya.ru
ORCID iD: 0009-0003-1489-8333

Head of Research and Technology Center

Россия, 344033, Russia, Rostov-on-Don, Portovaya Street, 543

Sergey A. Kurlovich

Trading and Industrial Company SYNTEZ

Email: mtdos@mail.ru
ORCID iD: 0009-0002-3606-6311

Director

Россия, 344033, Russia, Rostov-on-Don, Portovaya Street, 543

Dmitry I. Gladkikh

Don State Technical University

Email: ya.gladckih-dmitriy@yandex.ru
ORCID iD: 0000-0003-2292-256X

postgraduate student

Россия, 344010, Russia, Rostov-on-Don, Gagarin Square, 1

Tatyana V. Lavrenova

Don State Technical University

Email: bys_ka87@mail.ru
ORCID iD: 0000-0002-8283-7730

senior lecturer

Россия, 344010, Russia, Rostov-on-Don, Gagarin Square, 1

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Copyright (c) 2025 Fominov E.V., Kovtun M.V., Kurlovich S.A., Gladkikh D.I., Lavrenova T.V.

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