S. F. Ermakov
National Academy of Sciences of Belarus
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by S. F. Ermakov.
Journal of Friction and Wear | 2012
S. F. Ermakov
The paper presents an analysis of the state of the art in research into the effect of the composition of lubricants and additives of various origin on the friction of solids. It is shown that the combined application of additives with various structure, including those containing nanomaterials, is most effective from the viewpoint of lubricity. The objective is to attain an ordered state of lubricating films with a low shear strength in the friction zone.
Journal of Friction and Wear | 2010
V. I. Kolesnikov; S. F. Ermakov; F. Daniel; M. A. Savenkova; N. A. Myasnikova; E. I. Luneva
The work is devoted to investigation of the mechanism of secondary surface structures formed at the nanolevel and their study during frictional contact between solids separated by a lubricant film containing nanosize ceramic matter. The results of study of the NiO-P2O5-MoO3 system diagram are presented. The formation of nickel phosphoromolybdate is shown to occur in the system and its structure is studied using the methods of physicochemical analysis. Nickel phosphoromolybdate is introduced into the PUMA lubricant, employed in rail transport to oil rails and wheel flanges in order to retain the lubricating film and improve the tribological characteristics of the wheel-rail contact via realizing adaptability of the friction surfaces. This occurs at the nanolevel as well, where characteristic secondary structures are formed by the friction-induced effect of nanosize additives having mesogenic properties. The addition of nickel phosphoromolybdate stabilizes both the rheological and physicochemical properties of lubricating compositions of the PUMA series and minimizes their destruction. The molecular mechanism of the nickel phosphoromolybdate additive is also discussed in the work. The work was fulfilled within the framework of a systematic investigation of inorganic polymer phosphates used as multifunctional additives to railroad greases.
Doklady Physical Chemistry | 2014
V. I. Kolesnikov; N. K. Myshkin; S. F. Ermakov; A. P. Sychev
123 Currently, the efficient operation of transport and other industries necessitates reducing the energy con� sumption of machinery, which is associated with fric� tional interaction at friction units. Active control of the frictional interaction of solids is one of the chal� lenges of modern tribology [1–5]. Once friction is actively controlled, the response of the elements of tri� bological units to the energy input is reversible and can be done automatically with the help of modern control systems and the use of feedback. Research in this area is constantly evolving and focuses on several issues.
Russian Engineering Research | 2011
V. I. Kolesnikov; N. A. Myasnikova; E. N. Volnyanko; S. F. Ermakov; A. P. Sychev; A. A. Sychev
The addition of β-Sialon nanoparticles to lubricants in heavy-duty frictional joints is shown to be effective.
Journal of Friction and Wear | 2011
S. F. Ermakov; A. V. Beletskii; Vladimir Nikolaev
It is established experimentally using a pendulum tribometer that medical preparations based on hyaluronates and chondroitin sulfate exert unequal effects on the lubricity of blood serum during friction of cartilage against cartilage. The best tribological characteristics for the combinations with blood serum are demonstrated by drugs based on chondroitin sulfate, which display characteristics close to natural synovial fluid during frictional interaction of cartilage.
Archive | 2016
S. F. Ermakov; Alexandr Beletskii; Oleg Eismont; Vladimir Nikolaev
In this section summarizes the results of research into the field of living synovial joints and structural elements of the environment. Construction features of synovial joints are analyzed as of kinematic pairs capable of operation under considerable loads. Molecular and supermolecular structural arrangements of cartilage matrix and their influence on the deformation properties of cartilage tissue are considered. The latter is underlined to act as a specific damper of dynamic loads which participates in uniform distribution of pressure in joints. An analysis is presented of synovial fluid both as a lubricating medium and an active structural element of joints performing important biomechanical functions together with the cartilage tissue.
Journal of Friction and Wear | 2016
S. F. Ermakov; V. I. Kolesnikov; A. P. Sychev
A physical model of the lubricity of cholesteric liquid-crystal nanomaterials has been proposed in accordance with which the transition from single-crystal layers of a cholesteric liquid-crystal nanomaterial to polymolecular structurally sensitive liquid-crystal films, which occurs with varying temperature and is governed by the effect of molecules of cholesteric liquid-crystal compounds contained in the lubricant, as well as the reverse transition, lead to a reversible change in the shear resistance. This change results from the formation of continuous planar-oriented and helically twisted boundary layers in the zone of dynamic contact, which consist of molecules of the cholesteric liquid-crystal nanomaterials. The pitch distance of the helix and, therefore, the thickness of cholesteric liquid-crystal films of these nanomaterials exhibit a structurally sensitive response to changes in the temperature in the friction zone, which varies the dissipation of the energy during friction.
Russian Engineering Research | 2009
V. I. Kolesnikov; S. F. Ermakov; A. P. Sychev; V. V. Mulyarchik
The influence of the number of carbon atoms in the alkyl radical of cholesteric liquid-crystal nanomaterials and their concentration on the optical properties of mineral and synthetic lubricants is investigated. It is found that adding cholesteric liquid-crystal nanomaterials to lubricants changes their optical properties, as indicated by a switch from right rotation to left rotation of the polarization plane of transmitted light. It is shown that the angle of rotation of the polarization plane depends practically linearly on the concentration of cholesteric liquid-crystal nanomaterials, in semilogarithmic coordinates.
Journal of Friction and Wear | 2009
S. F. Ermakov; Vladimir Nikolaev; A. V. Beletskii; L. A. Pashkevich; O. L. Eissmont
The work describes the set-up and operation of a computerized pendulum tribometer for investigating the tribological characteristics of synovial joints. The validity of the system is established for studies of friction in the cartilage-cartilage interface when the partitioned joint contains lubricating media of various (artificial or natural) origins.
Journal of Friction and Wear | 2009
V. I. Kolesnikov; S. F. Ermakov; A. P. Sychev; N. A. Myasnikova; M. A. Savenkova; E. I. Luneva
The paper deals with the results of investigation of the physicochemical and triboengineering properties of Puma lubricating compositions used to grease rails and flanges and the same composition modified by the authors with inorganic molybdophosphate additive. The influence of the Puma lubricating compositions with the lithium molybdophosphate additive on the wear of wheel and rail steels is studied, as well as the likely mechanism of action of inorganic phosphorus-containing additives of the polymeric nature. The present paper continues a series of studies of the application of inorganic polymeric phosphates as multifunctional additives to plastic railway greases.