Статті в журналах: "Antifriction coating"

1

RODICHEV, A. Yu, R. N. POLYAKOV, A. V. GORIN, and М. А. ТOKMAKOVA. "STUDY OF THE CHARACTERISTICS OF THE FLAP BEARING WITH FILM ANTI–FRICTION COATING." Fundamental and Applied Problems of Engineering and Technology, no. 5 (2021): 88–94. http://dx.doi.org/10.33979/2073-7408-2021-349-5-88-94.

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The article contains a brief analysis of the applied film antifriction coatings used in mechanical engineering. The design diagram of a petal bearing with an antifriction film coating is presented. The mathematical apparatus for modeling the operating parameters of a petal bearing with an antifriction film coating is shown. The results of calculating some operating modes and parameters of a petal bearing with an antifriction film coating are presented. Recommendations are given for the further use of a petal bearing with an antifriction film coating.

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2

Родичев, Алексей, Aleksey Rodichev, Андрей Горин, Andrey Gorin, Мария Токмакова, Mariya Tokmakova, Алексей Киричек, and Alexey Kirichek. "ADHESION STRENGTH INVESTIGATION OF FILM ANTIFRICTION COATINGS." Bulletin of Bryansk state technical university 2019, no. 10 (November 7, 2019): 4–10. http://dx.doi.org/10.30987/article_5db95e857a4e02.22596904.

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The paper is dedicated to the investigation of adhesion strength in film coatings. The goal of the work is a qualitative estimate of the strength of film antifriction coatings applied on friction units of machines. The topicality is grounded by the fact that the friction decrease on surfaces in units ensures the increase of life, power effectiveness and reliability of machinery. Most of the works are dedicated to the study of manufacturing films, their phase composition, structure, stress-strain properties, whereas in the material offered the adhesion properties of film antifriction coating are emphasized, which is a sufficient novelty. During the investigations of the adhesion strength of antifriction film coatings there was used a method of a normal detachment. To carry out comparative tests there were prepared four groups of different antifriction coatings. For each coating under testing there were prepared five samples which were loaded with the smooth increase of a breaking tension. Therefore there are obtained experimental dependences of normal stresses (σ) upon relative elongation (ε), which allow using values obtained for surfaces coated with antifriction film coatings with different areas. Upon completion of coating tests both parts of the samples tested were subjected to visual analysis. In the course of the analysis a character of destruction was defined. As a result of the theoretical and experimental investigations carried out there were drawn conclusions describing a qualitative and quantitative estimate of the adhesion strength of antifriction film coating.

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3

Rodichev, Aleksey, Andrey Gorin, Mariya Tokmakova, and Alesey Kirichek. "INFLUENCE OF FORCE OF INERTIA ON COATING CLUTCH WITH EXTERNAL SURFACE OF ROTATION BODIES WHEN COATING." Bulletin of Bryansk state technical university 2020, no. 5 (May 13, 2020): 4–11. http://dx.doi.org/10.30987/1999-8775-2020-5-4-11.

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Анотація:

A paper is dedicated to the investigation of inertia impact upon coating adherence with the outer surface of revolution solids during coating application. The work purpose is a qualitative and qualitative assessment of factors of antifriction coating application affecting the parts of friction units of machines and units. The relevance is substantiated with that the strength increase of coating applied ensures life, reliability and power effectiveness of machines and mechanisms. The work novelty consists in the application of fundamental dependences and laws to actual manufacturing operations. Adhesion is a basic parameter charactering quality of the coating applied. Adhesion, in its turn, is characterized with adhesion strength and porosity of the coating applied. The material presented shows the impact of inertia acting upon particles of the coating applied at their falling on the outer surface of rotation. There are defined theoretical dependences describing the process mentioned. The analysis of these dependences shows that inertia can carry out both the positive and negative action during the application of antifriction coatings. To confirm the theoretical results obtained there were carried out experimental investigations. In the experiment took part some sets of samples upon which PRNH17SR4 antifriction coating was applied. Coating application was carried out with the aid of the Iskra-1 burner with the further fusing. For the qualitative and quantitative strength assessment of adhesion of the coating applied there was used a method for a shear test. The samples prepared were pressed through a matrix on the GMS-50 universal rupture-test machine. As a result of tests carried out there are obtained dependences characterizing adhesion of antifriction coating applied. The dependences obtained show efficient factors impacting the adhesion strength of coatings. By the results of theoretical and experimental investigations there are formulated qualitative and quantitative assessments of factors influencing the process of antifriction coating application on parts.

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4

Gorin, Andrei, Alexandr Novikov, Svetlana Karpeeva, and Мaria Tokmakovа. "Creation of modified friction surfaces." MATEC Web of Conferences 341 (2021): 00016. http://dx.doi.org/10.1051/matecconf/202134100016.

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The article provides information on the creation of modified friction surfaces. The results of the analysis of the applied antifriction film coatings are presented. One of the main problems in the application of thin film coatings is the lack of technological modes recommended by the manufacturer. The composition of the film anti-friction coating is described. The results of experimental studies of the deposition of thin film coatings are presented. Selected pneumatic spray gun for depositing of thin film coating. A series of experiments were carried out to identify the technological modes of applying thin film coatings. A qualitative and quantitative analysis of the results of applying thin film coatings has been carried out. A functional diagram of the application of an antifriction film coating is proposed. On the basis of the conclusions made, recommendations are given on the technological modes of applying thin film antifriction coatings on the modified friction surface.

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5

Maria Andreevna, Tokmakova, Novikov Alexander Nikolaevich, and Rodichev Aleksey Yurievich. "COMPARATIVE ANALYSIS OF METHODS FOR STUDYING THE ADHESION OF ANTIFRICTION COATINGS FOR FRICTION UNITS OF AUTOMOTIVE TECHNOLOGY AND TECHNOLOGICAL MACHINES." World of transport and technological machines 75, no. 4 (2021): 43–48. http://dx.doi.org/10.33979/2073-7432-2021-75-4-43-48.

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The article presents a study of the adhesive strength of adhesion of thin solid antifriction coatings. A brief analysis of existing methods for determining the adhesive strength of thin anti-friction coatings is performed. The method is described and experiments are carried out using a universal-purpose breaking machine with an electronic force meter IR5047-50 and a portable ad-hesive meter of the «Constant A» model. A number of quantitative estimates of the adhesion strength of the antifriction coating with the base are obtained. Conclusions are made about the adhesion strength of the coating and methods for determining its adhesion. Recommendations on the application of methods for determining the adhesive strength of thin solid antifriction coatings are given.

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6

RODICHEV, A. Yu, A. N. NOVIKOV, A. V. GORIN та M. A. TOKMAKOVA. "ОБРАЗОВАНИЕ МОДИФИЦИРОВАННЫХ ПОВЕРХНОСТЕЙ ТРЕНИЯ". World of transport and technological machines 74, № 3 (2021): 17–23. http://dx.doi.org/10.33979/2073-7432-2021-74-3-17-23.

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Анотація:

The article provides information on the formation of modified friction surfaces. The results of the analysis of the applied antifriction film coatings are presented. One of the main problems of applying thin film coatings is the lack of technological modes recommended by the manufacturer. The composition of the film antifriction coating is described. The results of experimental studies of the application of thin film coatings are presented. A pneumatic spray gun for applying thin film coatings was selected. A series of experiments were carried out to identify the technological modes of applying thin film coatings. A qualitative and quantitative analysis of the results of applying thin film coatings was performed. A functional scheme for applying an anti-friction film coating is proposed. Based on the conclusions made, recommendations are given on the technological modes of applying thin film antifriction coatings to the modified friction surface.

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7

Tsai, Pei-Ying, Tzu-En Chen, and Yueh-Lien Lee. "Development and Characterization of Anticorrosion and Antifriction Properties for High Performance Polyurethane/Graphene Composite Coatings." Coatings 8, no. 7 (July 16, 2018): 250. http://dx.doi.org/10.3390/coatings8070250.

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This work contributes to the development and characterization of the corrosion resistance and antifriction properties of high performance polyurethane (PU)/graphene (Gr) composite coating. In this study, PU composite coatings containing 0, 2, 4 and 8 wt.% of Gr were prepared and evaluated using various corrosion and mechanical tests, namely electrochemical impedance spectroscopy, salt spray tests, cross-cut tape tests and dynamic mechanical analysis. Antifriction properties of the coatings were evaluated using a tribometer with a ball-on-disc mode at room temperature. The corrosion resistance and adhesion property of the PU coatings were found to be enhanced by adding 4 and 8 wt.% of Gr. The coefficient of friction revealed that the antifriction properties of the PU/Gr composite coatings were 61% lower than those of the conventional coating when the Gr content was increased to 8 wt.%.

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8

Ipatov, Aleksey, and Sergey Shmykov. "SYNTHESIS OF ANTIFRICTION COATINGS BY THE FABO METHOD." Tekhnicheskiy servis mashin 1, no. 142 (January 2021): 140–47. http://dx.doi.org/10.22314/2618-8287-2020-59-1-140-147.

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In the paper, the technology of obtaining antifriction coatings by the method of finishing antifriction-free abrasive treatment with the implementation of the wear-free effect is proposed. (Research purpose) The research purpose is in developing an effective technology for obtaining copper coatings on the surface of steel parts of the shaft type to reduce the wear rate in the conditions of oil starvation of machine parts. (Materials and methods) During the study, a laboratory facility for the synthesis of antifriction coatings on the surface of steel parts by the method of finishing antifriction-free abrasive treatment has been developed. Brass of the LS-59-1 brand was used as a material for applying a copper antifriction coating. In order to activate the surface of the part and the surface of the filler material, a technological medium based on a ten percent solution of hydrochloric acid and glycerol was used. Authors determined the composition of the technological environment empirically. The obtained laboratory samples were subjected to tribological studies in comparison with standard antifriction alloys. X-ray diffraction studies were performed to determine the phase composition. (Results and discussion) As a result of X-ray diffraction studies of laboratory samples, the presence of iron and copper components in the synthesized coating was studied. The content of oxides on the surface of the coating is insignificant, the internal structure is dense with no visible porosity. The coating consists of 95 percent copper, the synthesis process takes place without oxidation, which gives the coating a high adhesive and cohesive strength. The coating thickness is uniform and varies within 3-5 micrometers. (Conclusions) Comparative tribological studies have shown high resistance to wear and to the setting of the contact surfaces under conditions of oil starvation. The coefficient of friction is stable and low and is in the range of 0.08-0.15. The developed technology makes it possible to increase the wear resistance of steel parts of the shaft type in the shortest possible time and with minimal material costs and can be successfully implemented in the conditions of repair enterprises.

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9

Ipatov, Aleksey G., and Sergey N. Shmykov. "SYNTHESIS OF ANTIFRICTION COATINGS BY THE FABO METHOD." Tekhnicheskiy servis mashin 1, no. 142 (March 2021): 140–47. http://dx.doi.org/10.22314/2618-8287-2021-59-1-140-147.

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Анотація:

In the paper, the technology of obtaining antifriction coatings by the method of finishing antifriction-free abrasive treatment with the implementation of the wear-free effect is proposed. (Research purpose) The research purpose is in developing an effective technology for obtaining copper coatings on the surface of steel parts of the shaft type to reduce the wear rate in the conditions of oil starvation of machine parts. (Materials and methods) During the study, a laboratory facility for the synthesis of antifriction coatings on the surface of steel parts by the method of finishing antifriction-free abrasive treatment has been developed. Brass of the LS-59-1 brand was used as a material for applying a copper antifriction coating. In order to activate the surface of the part and the surface of the filler material, a technological medium based on a ten percent solution of hydrochloric acid and glycerol was used. Authors determined the composition of the technological environment empirically. The obtained laboratory samples were subjected to tribological studies in comparison with standard antifriction alloys. X-ray diffraction studies were performed to determine the phase composition. (Results and discussion) As a result of X-ray diffraction studies of laboratory samples, the presence of iron and copper components in the synthesized coating was studied. The content of oxides on the surface of the coating is insignificant, the internal structure is dense with no visible porosity. The coating consists of 95 percent copper, the synthesis process takes place without oxidation, which gives the coating a high adhesive and cohesive strength. The coating thickness is uniform and varies within 3-5 micrometers. (Conclusions) Comparative tribological studies have shown high resistance to wear and to the setting of the contact surfaces under conditions of oil starvation. The coefficient of friction is stable and low and is in the range of 0.08-0.15. The developed technology makes it possible to increase the wear resistance of steel parts of the shaft type in the shortest possible time and with minimal material costs and can be successfully implemented in the conditions of repair enterprises.

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10

GRYADUNOVA, E. N., A. Yu RODICHEV, and М. А. TOKMAKOVA. "ESTIMATION OF THE QUALITY OF FILM ANTIFRICTION COATING USING A REGRESSION MODEL." Fundamental and Applied Problems of Engineering and Technology, no. 1 (2021): 96–101. http://dx.doi.org/10.33979/2073-7408-2021-345-1-96-101.

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The article presents the results of processing experimental studies of the quality of a film antifriction coating applied to a sliding bearing. A diagram of the forces acting on a film particle during the application of an antifriction coating is shown. A method for processing experimental data based on regression analysis is described. Several independent factors have been identified that affect the quality of the film antifriction coating. Recommendations are given for the rational change of the distance from the nozzle to the surface of the part, the angle of spraying and the rotation speed of the part that influenced the adhesion of the film antifriction coating to the workpiece.

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11

NOVIKOV, A. N., A. YU RODICHEV, A. V. GORIN, and M. A. TOKMAKOVA. "INFLUENCE OF TECHNOLOGICAL FACTORSFOR THE QUALITY." World of transport and technological machines 73, no. 2 (2021): 32–39. http://dx.doi.org/10.33979/2073-7432-2021-73-2-32-39.

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The article contains a study of the influence of technological factors on the formation of a film antifriction coating when applied to parts of cars and cars. The article presents a methodology and results of calculating the adhesion strength of a film coating with a steel base. The equipment used to determine the adhesion strength is presented. The technique of using the specified equipment is described. The dependence of the adhesion strength on the modes of film coating is established and described. Recommendations have been developed for the selection and method of applying film antifriction coatings during the maintenance and repair of motor vehicles.

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12

Rivin, G. L., E. G. Karpukhin, and A. O. Koshkina. "APPLICATION OF ANTIFRICTION COATINGS TO REDUCE CONTACT FRICTION IN STRETCH-FORMING PROCESS OF DOUBLE CURVATURE SHELLS ON A DIES MADE OF ALUMINUM ALLOYS." Izvestiya of Samara Scientific Center of the Russian Academy of Sciences 23, no. 1 (2021): 41–47. http://dx.doi.org/10.37313/1990-5378-2021-23-1-41-47.

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The article presents the results of research on antifriction coatings for use on die made of aluminum alloys. The expediency of using antifriction coatings to reduce friction when stretch-forming of double curvature shells is justified. To substantiate this, we performed numerical modeling of the skin-tight forming process in the «LS-dyna» CAE system. According to the results of modeling, the following relationship is observed: the lower the coefficient of friction, the more evenly distributed the thinning deformations over the thickness of the blank in stretch-forming. Test modes for determining the coefficient of friction on the MTU-01 friction machine and methods for obtaining other basic functional and technological properties of antifriction coatings are described. The antifriction and technological properties of coatings, such as the coefficient of friction, adhesion, wear resistance, conditional hardness, the time and temperature of polymerization of the coating are determined.

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13

Zhao, Yun Cai, Shu Feng Huang, and Xiao Mei Liu. "Study on the Lubrication and Antifriction Mechanism of Low Frictional Self-Lubricating Wear-Resisting Coating." Advanced Materials Research 339 (September 2011): 477–82. http://dx.doi.org/10.4028/www.scientific.net/amr.339.477.

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This paper is about the lubricating wear-resisting coating KF301/WS2 and round pit texturing modified coating KF301/WS2 which are prepared by supersonic plasma spraying, laser remelting and surface texturing technology, tribological characteristics of two kinds of coatings are studied under room temperature, according to this, it is discussed for lubrication antifriction mechanism. The research shows: round pit texture has a certain influence on friction factor of coating’s surface and abrasion loss. Friction coefficient of untextured surface is about 0.0138 in the initial stages, while friction coefficient of round pit texture is about 0.01, compared with the former, the latter decreases 27%; when wear time reaches to 1 hour, abrasion loss of untextured surface is 0.0026mg, while abrasion loss of round pit texture is about 0.013mg, compared with the former, the latter decreases 50%. The lubricant antifriction performance of round pit texture is higher than untextured surface, this is because friction coefficient of coating is decreased as the change of the third-body bed, and round pit micro moulding can collect abrasive particle, decreasing the influence of abrasive particle.

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14

Shepelenko, I. "Technological factors influence on the antifriction coatings quality." Problems of tribology 100, no. 2 (June 23, 2021): 50–57. http://dx.doi.org/10.31891/2079-1372-2021-100-2-50-57.

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The conditions for the antifriction coatings formation during finishing antifriction non-abrasive treatment (FANT) are analyzed. The requirements for this kind of coatings and the main criteria for assessing their quality are noted. A relationship has been established between the quality of the coating obtained with FANT and the technological factors that determine the conditions for contacting the tool with the treated surface. It is proved that the shape and size of microroughnesses of the treated surface determine the efficiency of the microcutting process and filling the microcavities with the rubbed material. Technological factors influence on the coating quality was investigated during FANT by implementing a multifactor experiment, as a result of which a connection was established between the technological parameters of the process (total friction path, load on the tool), as well as the length of the supporting surface with indicators characterizing the coating quality. Statistical models were obtained for mass transfer of antifriction material, area (continuity) of the coating and surface roughness at natural values of the factors, which made it possible to establish the studied factors influence on the optimization parameters. The analysis of the experimental scattering graphs made it possible to clarify the nature of the factors changes and analyze their mutual influence on the optimization criteria. Taking into account the inversely proportional relationship of the optimization criteria, the achievement of their maximum values at the same time is impossible, therefore, the values are taken according to the final result of the FANT process. The range of the studied factors values is established, the regularities of their change are substantiated from the point of view of the selected optimization criteria. Determination the rational values of the FANT process technological parameters will improve the antifriction coatings quality obtained by a friction-mechanical method.

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15

Li, Ying, Bian Xiao Li, and Wen Jun Zou. "The Relationship between Nanocrystalline Structure and Frictional Properties of Nanodiamond/Ni Composite Coatings by Brush Plating." Applied Mechanics and Materials 80-81 (July 2011): 683–87. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.683.

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Nanodiamond/Ni and Ni coatings were fabricated via brush plating. Nanocrystalline structure of the composite coating was investigated by SEM and XRD. The results showed that the composite coatings are nanocrystalline structure. The hardness of the nanodiamond/Ni composite coating is higher greatly than that of Ni coating. At same time, the reasons of formation nanocrystalline were discussed, which include the nucleation rate with the increase of a high over-potential, the reciprocating motion between brush and work piece, the heterogeneous nucleation of nanodiamond. The nanodiamonds as second phases make grain finer. The nanodiamonds of core-shell structure play the important role in wear resistance and antifriction. So the wear resistance of the composite coatings is significantly higher than nickel coating’s.

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16

Andrejeva, Darja, Armands Leitans, Alexanders Urbahs, Konstantins Savkovs, and Margarita Urbaha. "Evaluation of the Friction Coefficient of Antifriction Coatings Based on Ti-Cu Obtained by the Ion-Plasma Deposition in Vacuum." Key Engineering Materials 799 (April 2019): 15–19. http://dx.doi.org/10.4028/www.scientific.net/kem.799.15.

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Ion-plasma antifriction coatings based on Ti-Cu were deposited by the method of ion-plasma sputtering in vacuum with the aim to gain a coating with a low coefficient of friction. To protect steel part from wear intermetallic, nitride and conglomerate coatings based on Ti-Cu with thickness of the coating h ≈ 2-5 μm obtained at different regimes of deposition. Thickness of the antifriction coatings and proportion of the chemical composition varied by deposition time, voltage and current of the magnetron, current of evaporators, pressure of gas in a vacuum chamber. This paper presents the results of the tribotest carried out on CSM Instruments pin-on-disk type tribometer. Comparing with uncoated samples microhardness and roughness of the coated samples increased two to three times, coefficient of friction of coated samples was twice lower.

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17

Veselovsky, A. A., V. V. Erofeev, and I. P. Troyanovskaya. "Improving the Quality of Friction Surface by Applying Antifriction Materials to Them." IOP Conference Series: Earth and Environmental Science 949, no. 1 (January 1, 2022): 012133. http://dx.doi.org/10.1088/1755-1315/949/1/012133.

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Abstract The article investigated the process of applying antifriction coatings to the surface of hardened cast iron gear wheels. The diffusion coating of cast iron wheels with vanadium greatly strengthened the surface and increased its wear resistance. Aluminium, tin bronze and copper were used as antifriction materials. The coating was applied with metal brushes. The brushes tore off individual fragments of anti-friction metal particles and smeared them over the surface of the coated product. Research results have confirmed the acceptability of this method instead of expensive finishing operations that cannot be applied to diffusion-hardened gears due to the shallow depth of the vanadium coating. The proposed method is universal for all types of metal products operating under sliding friction conditions. Results are presented as spatial histograms.

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18

Ipatov, Aleksey G., and Sergey N. Shmykov. "Performance characteristics of modified antifriction coatings based on the metal composition." Tekhnicheskiy servis mashin, no. 1 (March 1, 2020): 186–94. http://dx.doi.org/10.22314/2618-8287-2020-58-1-186-194.

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This paper proposes the technology for obtaining antifriction coatings by short-pulse laser treatment of powder compositions. (Research purpose) The research purpose is in synthesizing thin anti-friction coatings on the surface of steel substrates by short-pulse laser treatment of metal powder compositions and analyze their physical and mechanical properties. (Materials and methods) A solid-state pulsed laser generator was used to synthesize antifriction coatings. B83 babbit powder has been used as an additive material. The powder composition was additionally doped with PMS-1 copper and molybdenum disulfide in order to increase the friction properties and load-bearing capacity of the coatings. Laboratory samples were subjected to wear tests under boundary friction conditions using the SMT-2070 friction machine in comparison with standard surfaces of B83 babbite coating, steel surface, and Molykote d-321R clad surface. X-ray diffractometer DRON-6 was used for x-ray diffractometry. (Results and discussion) It was found that the porosity of the modified coating does not exceed 5 percent, and there are no traces of detachment and destruction in the experimental samples. It was found that the coefficient of friction of the analyzed coating under conditions of boundary friction was 0.12-0.13, which corresponds to the coefficient of friction of a standard babbit alloy. The modified coating have a more efficient workability and a stable coefficient of friction over a large range of loads. It was found that the wear intensity of the analyzed coating is significantly lower than one of the compared surfaces. The increase in friction characteristics is due to the features of the coating structure, which is characterized by a large number of solid intermetallic compounds Cu3Sn having a hexagonal structure, which determines the low friction coefficient. (Conclusions) The results shows the high practical potential of modified antifriction coatings that can be used in mechanical engineering and repair production in the design and restoration of bearing assemblies.

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19

Biryukov, V. P., and T. A. Bazlova. "Antifriction Coating Laser Cladding on Steel." Photonics Russia 13, no. 2 (2019): 170–76. http://dx.doi.org/10.22184/fros.2019.13.2.170.176.

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20

Zhao, Yuncai, Fei Yang, and Yongming Guo. "Study on antifriction mechanism of lubricating wear-resistant coating with parallel texture." Industrial Lubrication and Tribology 67, no. 5 (August 10, 2015): 418–24. http://dx.doi.org/10.1108/ilt-11-2013-0117.

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Purpose – The purpose of this paper is to investigate the effects of parallel texturing coating on antifriction mechanism of lubricating wear-resistant coating. Design/methodology/approach – A KF301/WS2 lubricating wear-resisting coating was prepared on matrix material GCr15 by applying supersonic plasma spraying technology. On the basis of this sample, the KF301/WS2 modified coating with parallel pit-type texture was prepared by laser re-melting technology and a surface texturing technique. Their friction and wear behaviors were evaluated under ambient temperature, and the antifriction mechanism of two kinds of coatings were discussed. Findings – Results showed that parallel texture has a certain impact on the tribological properties of the coating. When friction and wear reach stable state, the value of the friction coefficient of conventional coating was 0.115, while that of parallel texturing coating was 0.09, the latter decreased by 21 per cent. When the friction and wear time was up to 4 hours, the wear loss of the conventional coating was 0.29 mg, while that of the parallel texturing coating was 0.13 mg, the latter decreased by 55 per cent. Originality/value – The tribological properties of parallel texturing coating were higher than conventional coating. That is because the change of three-body layer reduces the friction coefficient and the abrasive particles were collected by parallel texture, reducing the effects of debris.

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21

WANG, Y. M., B. L. JIANG, L. X. GUO, and T. Q. LEI. "ANTIFRICTION PROPERTY OF MICROARC OXIDATION COATING ON TITANIUM ALLOY UNDER SOLID LUBRICATING SLIDING CONDITION." Surface Review and Letters 11, no. 04n05 (August 2004): 367–72. http://dx.doi.org/10.1142/s0218625x04006360.

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Ceramic coatings were fabricated on Ti6Al4V alloy surface by microarc oxidation (MAO) in Na 2 SiO 3–( NaPO 3)6– NaAlO 2 solution using an AC power supply. Microstructure and phase composition of coating were characterized by SEM and XRD, respectively. The antifriction property of the coating with and without solid lubricant sliding against SAE 52100 steel ball was investigated on a pin-on-disk friction and wear tester. The results show that the microarc oxidation coating is relatively dense and uniform, mainly composed of rutile and anatase. The coating sliding against the steel has friction coefficient as low as 0.2–0.3 at an applied load of 0.5 N and sliding cycle below 2500, which is much smaller than that of uncoated Ti6Al4V against the same counterpart. The transferring of materials from the softer steel ball onto the coating surface is the main wear event, while the microarc oxidation coating is characterized by slight abrasive wear and adhesive wear. Introducing solid graphite lubricant into the porous surface of microarc oxidation coating significantly improves the long-term antifriction property (registering friction efficient of 0.15 in the long-term sliding) under a similar sliding condition. This improvement is attributed to the reduction of materials that are transferred from the softer steel ball onto the coating surface.

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22

Shcherbakov, Igor N. "Analysis of Phase Composition and Properties of Composite Nickel-Phosphoric Coatings Using Wear-Resistant and Antifriction Modifying Agents." Materials Science Forum 1037 (July 6, 2021): 423–28. http://dx.doi.org/10.4028/www.scientific.net/msf.1037.423.

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The possibility of introduction of antifriction and wear-resistant modifying agents into the matrix of a composite nickel-phosphorus coating to obtain effective composite coatings, is considered. The analysis of the possible influence of modifying additives in the form of ultrafine powders on the tribological properties of the developed coatings, is carried out.

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23

Sobachkin, Aleksei V., and A. A. Sitnikov. "Features of the Formation of Various Functional Coatings of SHS Mechanical Composites Using Gas Detonation Spraying Technology." Solid State Phenomena 299 (January 2020): 879–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.879.

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The present work is devoted to the determination of the characteristics of the deposition of coatings for various areas of technology, using the technology of gas detonation spraying of powder SHS mechanical composites. In the work, the most rational modes of coating deposition were determined, macro-and microstructures, surface topography, as well as coating properties (antifriction, micro-hardness, wear resistance) were investigated, and energy dispersion and X-ray phase analysis of raw materials and gas detonation coatings were carried out.

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24

Buyanovskiy, Ilya, Vladimir Levchenko, and Vladimir Samusenko. "Investigation of the structure, composition and tribological characteristics of nanostructured monocrystalline coatings obtained by ion plasma technology." Science intensive technologies in mechanical engineering 2022, no. 4 (April 6, 2022): 41–48. http://dx.doi.org/10.30987/2223-4608-2022-4-41-48.

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Synthesis technologies and mechanisms of action of nanostructured monocrystalline coatings using ion-plasma technologies have been viewed. This coating builds up a strong boundary layer on working surfaces of heavily loaded friction units, which provides the lubricant with high antifriction properties generated by triboprocess in boundary lubrication mode.

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25

Ivanov, V. G., and V. S. Bublikov. "Formation of MAO-coatings of high thickness on titanium alloys and evaluation of tribological properties in friction pair with bronze." Voprosy Materialovedeniya, no. 1(105) (April 14, 2021): 41–51. http://dx.doi.org/10.22349/1994-6716-2021-105-1-41-51.

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The article presents experimental data on the effect of microarc oxidation parameters on the thickness and structure of the MAO-coating and its tribological characteristics in friction against bronze. The appli- cation of thick antifriction coatings by the MAO-method on titanium alloys has been developed. The possibility of using MAO-coatings of high thickness in sliding friction units was investigated.

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26

Норман, А., A. Norman, В. Смоленцев, V. Smolentsev, В. Золотарев, and V. Zolotaryov. "Modification of surface layer in aluminum alloys by electroerosion coating." Science intensive technologies in mechanical engineering 1, no. 4 (April 30, 2016): 14–21. http://dx.doi.org/10.12737/18097.

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The mechanism of plating on low-melting alloys (for example, aluminum) cast-iron coatings having a high fusion temperature is considered. By means of this method one achieves in light aluminum alloy parts higher performance attributes to which belong reliable protection of parts with a coating against aggressive influence of chemically active substances. Besides, antifriction properties of parts operating in friction units are improved. The technological modes are developed and a coating process is designed. The example of the method offered is shown.

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27

Ostapenko, R. "Research of tribotechnical properties of antifriction polymer compositions." Problems of tribology 99, no. 1 (March 21, 2021): 33–42. http://dx.doi.org/10.31891/2079-1372-2021-99-1-33-42.

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The analysis of antifriction polymer compositions on the basis of polyamide, epoxy, phenol-formaldehyde, furan resins, and also on the basis of fluoroplastic with various fillers working in friction knots is made. The influence of fillers on the mechanisms of friction is little studied, so when creating antifriction compositions capable of working in conditions of lubrication in water, the following tasks were set: to justify the number and type of fillers; to investigate the influence of fillers on the process of wear of material and counterbody; determine the optimal composition of the antifriction composition that provides minimal wear of the coating and the counterbody. The object of study were: compositions based on phenol-formaldehyde resin and fluoroplastic, modified with antifriction fillers; details of submersible pumps. The basis of the study was the study of tribotechnical and technological properties of polymer compositions. Based on the analysis of literature data, the target fillers for the creation of antifriction compositions for radial plain bearings and thrust bearings of submersible pumps are selected, their number and composition are substantiated. The criterion for optimization was the mass wear of the polymer coating and the counterbody. The optimal composition of the antifriction composition for radial plain bearings, which contains: a mixture of colloidal graphite Cl and carbon fabric "TGN-2M"; molybdenum disulfide DM-1; powder polyamide 12 APN-B; crushed prepreg comprising a fiberglass filler impregnated with a modified phenol-formaldehyde resin P2M. For thrust bearings, the optimal composition of the fluoroplastic composition is determined, which includes: fluoroplastic F4; molybdenum disulfide; carbon fabric; powdered copper. The physical and mechanical properties of the optimal composition are presented. Technological equipment has been developed for the restoration and manufacture of plain bearings and submersible pump bearings. Molds are made for industrial implementation.

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Ramesh, C. S., R. Suresh Kumar, G. Dilip Maruthi, and R. Rashmi. "Study of Slurry Erosive Wear Behavior of Titania-30 Wt% Inconel-718 Plasma Sprayed Mild Steel Using Taguchi Technique." Applied Mechanics and Materials 813-814 (November 2015): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.111.

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Surface coating is sharing the responsibility between coating and substrate, which enhances the surface properties such as strength, hot hardness and toughness, wear resistance, antifriction and chemical inertness. The present work is focused on wear behavior of Mild Steel substrate material deposited with Titanium dioxide-30 wt % of Inconel718 incorporating plasma spray process. These composite coatings were subjected to slurry erosion wear test by simulating the corrosive-erosive atmosphere by mixing of silica sand and 3.5 percent of NaCl in distilled water. Under identical conditions, coated mild steels gave better wear resistance compared to uncoated sample.

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29

Горленко, Александр, and Aleksandr Gorlenko. "Wear resistance increase in friction surfaces of spherical journal bearings by finish plasma strengthening." Science intensive technologies in mechanical engineering 1, no. 8 (August 30, 2016): 42–48. http://dx.doi.org/10.12737/20816.

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The technology of finish plasma strengthening (FPS) with the multi-layer nano-coating of the Si-O-CN system as applied to the friction surface strengthening in spherical journal bearings is considered. This method relates to the processes of tubeless chemical precipitation of coatings at atmosphere pressure with the use of volatile fluids of element-organic compounds and gas environment with the simultaneous activation of a surface by electroarc plasma. The essence and distinguishing features of FPS are analyzed. Tribological characteristics of an applied wear resistant antifriction coating are investigated which stipulate for wear resistance increase in spherical journal bearings.

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30

Voyer, Joel, Johann Zehetner, Stefan Klien, Florian Ausserer, and Igor Velkavrh. "Production and Tribological Characterization of Tailored Laser-Induced Surface 3D Microtextures." Lubricants 7, no. 8 (August 6, 2019): 67. http://dx.doi.org/10.3390/lubricants7080067.

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The aim of the present study was firstly to determine the manufacturing feasibility of a specific surface 3D-microtexturing on steel through an ultra-short pulsed laser, and secondly to investigate the tribological properties under 2 different lubrication conditions: oil-lubricated and antifriction coated. The selected 3D-microtexture consisted of 2 different levels of quadratic micropillars having side dimensions of approximately 45 µm, heights of about 35 µm and periods of 80 µm. It was shown that the production of specific 3D-microtextures on steel substrates using an ultra-short pulsed laser was feasible, and that the reproducibility of the texture dimensions over the entire textured region was extremely good. Frictional investigations have shown that, in comparison to the benchmark (untextured samples), the 3D-microtextured samples do not induce any significant improvements in the coefficient of friction (COF) under oil-lubricated conditions, but that under antifriction coated conditions, significant improvements in the friction coefficients may be achieved. Wear-based tribological tests have shown that the antifriction coating on benchmark samples was completely depleted, which greatly influenced their friction and wear behavior, since steel-steel contact occurred during testing. For the 3D-microtexture, the antifriction coating was also partially depleted; however, it accumulated itself in the microtexture which acted as a potential lubricant reservoir.

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31

Liu, Zhao Wei, Xiao Wang, Yu Lin Qiao, and Si Jie Wang. "Structure and Properties of Ti-Si Composite Ceramic Coatings by Laser Cracking with SiO<sub>2</sub> Particles." Key Engineering Materials 915 (March 29, 2022): 53–58. http://dx.doi.org/10.4028/p-di5401.

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Ti-Si composite ceramic coating containing SiO2 particles was prepared on 45 steel substrate by in-situ laser pyrolysis with laser power of 600W and laser wavelength of 980nm. The density and wear resistance of the composite ceramic coating were improved. By means of scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), reciprocating friction and wear tester, the element composition, existing forms, surface morphology and friction and wear properties of Ti-Si composite ceramic coatings with different mass fraction of SiO2 particles were analyzed. The results show that the addition of SiO2 particles can improve the surface density and inorganic degree of the composite ceramic coating. When the mass fraction of SiO2 is 1% and the load is 1N, the friction coefficient of the composite ceramic coating is 61% lower than that of 45 steel. When the mass fraction of SiO2 is 5% and the load is 3N, the friction coefficient of the composite ceramic coating is 51% lower than that of 45 steel. The composite ceramic coatings show good antifriction performance and wear resistance.

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32

Guryn, S. V., I. N. Pogrelyuk, V. N. Fedirko, and V. M. Dovgunyk. "Multicomponent coating applications for increasing antifriction properties of titanium." Russian Journal of Non-Ferrous Metals 48, no. 2 (April 2007): 153–56. http://dx.doi.org/10.3103/s1067821207020150.

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33

Abdullah, Rasheed A., Shepelenko Ihor, and Posviatyenko Eduard. "Experimental quality improvement of the application of antifriction coating." Journal of Physics: Conference Series 1706 (December 2020): 012187. http://dx.doi.org/10.1088/1742-6596/1706/1/012187.

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34

Urbahs, A., M. Urbaha, K. Savkovs, and D. Andrejeva. "Protective antifriction multilayer nanostructured coating by ion-plasma sputtering." IOP Conference Series: Materials Science and Engineering 251 (October 2017): 012074. http://dx.doi.org/10.1088/1757-899x/251/1/012074.

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35

Shcherbakov, I. N. "Composite antifriction coating modified with copper complex and fluoropolymer." IOP Conference Series: Materials Science and Engineering 1029 (January 19, 2021): 012028. http://dx.doi.org/10.1088/1757-899x/1029/1/012028.

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36

Kuksenova, L. I., D. A. Kozlov, and M. S. Alekseeva. "Study of operational properties of steel friction pairs with antifriction coating from copper alloys produced by electric spark alloying." Physics and Chemistry of Materials Treatment 4 (2021): 31–41. http://dx.doi.org/10.30791/0015-3214-2021-4-31-41.

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Improving the reliability, durability and safety of operation of heavily loaded friction units is an urgent problem in physics, chemistry and surface mechanics. The tribotechnical characteristics of coatings made of bronzes BrAZhMts10-3-1.5 and BrMtsF3-6, applied by electrospark alloying on bushings made of structural steel 30KhGSN2A for operation under conditions of high contact pressure under friction without lubrication, have been investigated. Modes of coating deposition from the standpoint of tribology (the value of the electric discharge current in a pulse, the value of the longitudinal electrode feed per one rotation of the part, the rotation speed of the workpiece, the number of passes during processing, finishing of the coating) have been developed. It was found that when applying bronze BrMtsF3-6 to obtain a high-quality coating, the process must be performed in a protective atmosphere of argon to prevent phosphorus burnout. The tribotechnical efficiency of coatings when working under dry friction conditions is shown. For the steady-state wear mode, the friction coefficient is 0.10 – 0.13 at a pressure of 200 – 250 MPa, the wear resistance of coated steel is doubled. Steel with a bronze coating BrAZhMts10-3-1.5 has a higher bearing capacity, with BrMtsF3-6 coating — a higher antifriction. The ways of increasing the service life of steel-coated steel friction pair are analyzed.

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37

Gotlib, Elena M., Аlmira R. Khasanova, Engel R. Galimov, and Аlla G. Sokolova. "Epoxy antifriction wollastonite-filled materials." Vestnik MGSU, no. 3 (March 2019): 311–21. http://dx.doi.org/10.22227/1997-0935.2019.3.311-321.

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Introduction. Domestic mineral natural-origin filler ‘wollastonite’, also known as calcium methyl silicate, is widely used as a base for wear-resisting epoxy antifriction materials. Due to anisodiametric shape of its particles, wollastonite functions as a micro reinforcement fibre enhancing adhesion strength and wear resistance of epoxy compositions, improving their antifriction properties, especially when organomodifying by quaternary ammonium salts. In this regard, the investigation of the impact of chemical composition of such surfactants as quaternary ammonium salts on the properties of epoxy compound materials presents utmost interest for researchers developing low-friction materials. Materials and methods. Epoxy diane resin ED-20 was hardened with aminoalkylphenol AF-2. Content of epoxy hardener was determined by equimolar ratio of epoxy groups to amine groups. Domestic wollastonite of the grade Miwoll 10-97 was used as filler, particle length to the diameter correlated as 15:1. The wollastonite surface was activated with surfactants belonging to domestically produced quaternary ammonium salts. Wear resistance of specimens was tested by means of the vertical optical caliper IZV-1. Friction coefficient was estimated with the assistance of the computer-automated frictional machine CSM Instruments Tribometer. Adhesion strength of glue joint was determined as per GOST 28840-90 standard. Two bars of sheet aluminium were used as glued surfaces as per GOST 14759-69 standard. Results. Reduction of wear of epoxy coatings when modified with micro reinforcing wollastonite can be explained by the increase of cross-linking degree of the polymer. The length of alkyl radical of quaternary ammonium salts used for wollastonite surface activation affects the intervals between the epoxy links. As the quaternary ammonium salt chain length is growing, wear of epoxy materials is reducing. Introduction of the wollastonite containing metallic oxides in the epoxy composites increases wear resistance and adhesion strength and reduces coating friction coefficients. Conclusions. Hardened with the AF-2 and filled with the wollastonite of the Miwoll 10-97 grade, the epoxy compound materials have enhanced wear resistance and adhesion strength and lower friction coefficient. The best result is observed when applying wollastonite modified with a surfactant belonging to the class of quaternary ammonium salts. The wollastonite can be used for practical purposes as a perspective reinforcing agent for epoxy materials with improved wear resistance, enhanced adhesion to metals and reduced friction coefficient.

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38

Rodichev, A. Yu, A. V. Sytin, and V. O. Tyurin. "Research on Influence of Technology of Bimetal Fluid-Film Bearing Manufacturing on Microstructure and Microhardness of Antifriction Coating and Steel Base." Solid State Phenomena 265 (September 2017): 416–21. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.416.

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The paper features the results of metallographic studies and measurements of microhardness of the antofriction coating and surface layer of a bimetal fluid-film bearing base. The character of influence and the peculiarities of the process of adhesion of antifriction coating and the basic material of the part were identified. The analysis of structural changes occurring during the distribution of temperature in the surface layer of the part was implemented.

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39

Urbahs, Alexander, Konstantins Savkovs, Margarita Urbaha, and Darja Andrejeva. "Evaluation of the Physical and Mechanical Characteristics of Ion-Plasma Antifriction Coatings Based on Ti-Cu." Key Engineering Materials 788 (November 2018): 59–67. http://dx.doi.org/10.4028/www.scientific.net/kem.788.59.

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A modern method of processing steel parts by ion-plasma sputtering in vacuum is proposed as a solution to the problem of friction and wear. An ion-plasma coating based on Ti-Cu has been developed. Such parameters as microhardness, roughness, friction coefficient of the intermetallic, conglomerate and nitride coatings have been studied

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40

Ying, Li Xia, Xiao Hui Wang, Chun Jie Zhang, Guan Nan Liu, and Gui Xiang Wang. "Effect of PTFE Content on Microstructure and Tribological Properties of Cu-Sn Coating." Advanced Materials Research 1142 (January 2017): 173–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1142.173.

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The aim of this paper is to obtain the Cu-Sn-PTFE composite coating with wear-resistant and antifriction properties, which can improve the comprehensive performance of Cu-Sn coating and satisfy the self-lubricating property in special working condition. This coating was prepared by pulse current on the basis of non-cyanide pyrophosphate-stannate Cu-Sn plating bath. The effect of PTFE content on the microstructure, composition, microhardness, and tribological properties were analyzed and compared in detail. Results show that with appropriate PTFE content, the composite coating of Cu-Sn-PTFE displays preferable low friction and anti-wear behavior.

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41

Tsareva, Irina, Olga Berdnik, Lyudmila Krivina, and Yuri Levanov. "The gas-dynamic antifriction coating of babbitt for bearings of the turbine rotor." MATEC Web of Conferences 298 (2019): 00036. http://dx.doi.org/10.1051/matecconf/201929800036.

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The application of the anti-friction coating of babbitt on the working surface of sliding bearings is an important technological procedure necessary both for their manufacture and for their repair. To extend the service life and restore the performance of bearings, the coating is preferably applied by gas-dynamic spraying, The coating formed by this method has a low porosity, high adhesion strength and low friction coefficient.

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42

Zhao, Jianbo, Yong Wang, Bin Han, Meiyan Li, and Gang Cui. "Antifriction effects of Cu2S film on Ni-based MMC coating." Surface and Coatings Technology 315 (April 2017): 391–98. http://dx.doi.org/10.1016/j.surfcoat.2017.03.001.

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43

Oskolkova, Tatiana N. "Wear-Resistant Coating on Hard Alloy." Applied Mechanics and Materials 788 (August 2015): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amm.788.281.

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In this research new data on the effect of zirconium as an ingredient of the ionic-plasma (Ti, Zr)N coating which is spread on the alloy VK10 KS was obtained. It was found that the introduction of zirconium into the coating composition led to an increase in nanohardness by 23 % up to 38500 MPa and in Young’s modulus – by 67 %, which indicated an increase of energy of atomic bonds and in strength of materials. Also, it led to an increase in an antifriction ability and decrease in the friction constant of the coating up to μ = 0,07, a satisfactory adhesive strength of coating, i.e. in general improved the service features of the whole alloy.

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44

Горленко, Александр, Aleksandr Gorlenko, Александр Ерохин, and Aleksandr Erokhin. "WEAR-RESISTANCE INCREASE IN SURFACES OF SPHERICAL SLIDING BEARINGS." Bulletin of Bryansk state technical university 2016, no. 4 (December 28, 2016): 15–21. http://dx.doi.org/10.12737/23136.

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Анотація:

A technology of plasma finishing strengthening with multilayer nanocoating of Si-O-C-N system in the context of strengthening of friction surfaces in spherical sliding bearings is considered. The tribological characteristics of an applied wear-resistant antifriction coating which condition on wear-resistance increase in spherical sliding bearings are investigated.

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45

Sidashov, A. V., M. V. Boiko, E. I. Luneva, and A. M. Popov. "Investigation of changes in the properties of diamond-like films under friction by the XPS method." Journal of Physics: Conference Series 2131, no. 5 (December 1, 2021): 052038. http://dx.doi.org/10.1088/1742-6596/2131/5/052038.

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Abstract The combination of unique physicochemical, mechanical and tribological properties of diamond-like coatings determines the prospects for their use in critical friction units, including those operating in a rarefied atmosphere and vacuum. The properties of diamond-like carbon (DLC) coatings depend on the contribution of the sp2 and sp3 fractions of the carbon hybrid atomic electron orbitals. Modern methods of determining the graphite and diamond proportion in coatings are time-consuming and insufficiently accurate. In addition, the determination of the sp3/sp2 ratio is often difficult due to the displacement of the energy position of the C1s electron line. In this paper, the change in the chemical state of carbon over the thickness of a diamond-like coating is studied by X-ray photoelectron spectroscopy. Analysis of the carbon line fine structure of the differential graphite spectra (sp2 bonds) and diamond (sp3 bonds) allowed us to establish the parameter δ, which determines the ratio of the graphite and diamond components in the DLC coating. Profiling with Ar+ ions of the diamondlike coating surface showed that with an increase in the etching time, the proportion of amorphized carbon increases, which means that the antifriction properties increase with the abrasion of the coating. The obtained regularities allow us to predict changes in the tribological properties of DLC coatings during operation. Ion profiling also allows to determine the thickness of coatings with high accuracy.

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46

Ivanov, V. V., S. I. Popov та A. V. Kirichek. "Qualitative Characteristics of МоS₂Solid-Lubricant Coating Formed by Vibro-Wave Impact of Free-Moving Indenters". Key Engineering Materials 736 (червень 2017): 18–22. http://dx.doi.org/10.4028/www.scientific.net/kem.736.18.

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The purpose of the investigations carried out is the formation of qualitative nanostructured coatings and development of methods for their application on product surfaces. The principle of a staged study of regularities in the formation of vibration mechanical-chemical coatings from “top to bottom” and “bottom-up” formed a basis of a methodological approach to investigation carrying out. Experimental researches were carried out with the use of specially developed working chambers installed upon vibration machines. As an indenter there were used metal balls 2-5 mm in diameter and made of steel of ShH15 type, samples material – steel 45. The assessment of coating characteristics was carried out with the use of optical, raster scanning probe microscopy. It is determined through the result in the investigations of the impact-pulse interaction of a working environment part under conditions of vibration impact that there are grindings and changes in particles dimensions up to 100 nm and lesser in coating material which allows them to penetrate into micro-and nanocavities of basic metal and, in such a way, to form coating with high antifriction properties. The influence of amplitude-frequency properties of vibro-wave activation upon quality and performance attributes of coating surfaces and also process duration is determined.

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47

Andreeva, A. V., S. N. Popov, and M. E. Savvinova. "Power Line Pylon for Installation in Heaving Permafrost Soil." IOP Conference Series: Earth and Environmental Science 988, no. 5 (February 1, 2022): 052025. http://dx.doi.org/10.1088/1755-1315/988/5/052025.

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Abstract Based on analysis of known patent and scientific and technical information, new design of power line pylon has been developed, intended for installation in heaving permafrost soils. Cryophobic antifriction coating is applied to pylon surface located in active layer of soil to reduce intensity of pylon upfreezing from soil. It is proposed to place mechanical devices that increase adhesion to frozen soil below the zone of maximum summer thawing. The possibility of using polyurethane as cryophobic coating is considered. Studies have been carried out to maintain adhesion of coating to concrete surface in process of atmospheric exposure for two years.

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48

Belotserkovsky, М. A., A. A. Kurilyonok, K. E. Belyavin, and I. A. Sosnovsky. "OPTIMIZATION OF THE PROCESS OF MULTILAYER CENTRIFUGAL INDUCTION SURFACING OF COATINGS BASED ON ALUMINUM ALLOYS." Mechanics of Machines, Mechanisms and Materials 2, no. 55 (June 2021): 35–41. http://dx.doi.org/10.46864/1995-0470-2021-2-55-35-41.

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As a result of the conducted research, using the methods of mathematical planning of the experiment, the optimization of the process of multilayer centrifugal induction surfacing of antifriction coatings based on aluminum alloys was performed, which made it possible to develop a mathematical model and determine the optimal range of values of technological modes. The dependences of the minimum wear rate of the coating material Iq (mg/m) on the parameters of multilayer induction centrifugal surfacing of aluminum alloy coatings are established. The main factors affecting the wear rate of the coating were the heating temperature of the part T (°C), the time of the isothermal exposure t (min) and the speed of rotation of the part n (rpm). Based on the results of computational and experimental modeling, it is shown that in order to obtain the optimal wear intensity of the aluminum alloy coating material, the parameters of the multilayer centrifugal induction surfacing process should be as follows: the rotation speed of the part n = 1,750–1,875 rpm, the heating temperature of the part T = 775–800 °C, the isothermal exposure time t = 7–8 min.

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49

Kangalov, Plamen, Mitko Nikolov, and Iliya Todorov. "Abrasion Resistance of Restorative Coatings for Crankshafts and Bearings in Agricultural Machinery." Acta Technologica Agriculturae 25, no. 1 (March 1, 2022): 27–32. http://dx.doi.org/10.2478/ata-2022-0005.

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Abstract The paper presented examines the dynamics of wear of restored parts using different materials for the friction pair. The pair of crankshaft and sliding bearing largely determines the machine service life – although their overall wear index is less than 1%, it can still lead to a large number of failures and malfunctions. Vibrating arc overlaying in a shield of gas mixture of 60% argon and 40% carbon dioxide was used for restoring the surface of rollers. Subsequently, these were treated by heating with high-frequency current (HFC) and lowered to a hardness of 55±2 HRC and ground to the final size. It was found that the antifriction coating of plain bearings with electrochemical lead alloy ЕО92 showed excellent performance and insignificant wear in combination with reference material St45 and welded coating DUR500. In combination with electrochemical lead alloy ЕО92, the welded coating DUR500 showed a significantly higher wear on actuation compared to the reference material St45 at sliding friction. The relative wear resistance enhancement of crankshafts and bearings by restorative coatings represents an essential measure, as their service life can be prolonged by 20–50% in contrast to the new parts without restorative coatings.

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50

Vereschaka, Alexey Anatolevich, Julia Prilukova, Boris Y. Mokritskii, Anatoly S. Vereshchaka, and Nikolay Sitnikov. "Specifics of Application of Cutting Ceramics with Functional Coating in Turning of High-Strength Materials." Materials Science Forum 857 (May 2016): 221–27. http://dx.doi.org/10.4028/www.scientific.net/msf.857.221.

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This paper reviews some of the features of application of cutting ceramics with Ti-TiN-(TiAlZr)N coating for machining of high-strength hardened alloy steel. The study has revealed the conceptual role of coatings on ceramic cutting tools, which can serve as a scientific and technological basis for further improvement of the ceramic tool. It has been found out that the coating increases the antifriction properties of ceramics both due to lower coefficient of friction of the coating material and to reduction of roughness of rake face of the tool, and that is the main cause of 25% reduction in cutting force components for the coated tool, wherein the difference in cutting forces for the coated and uncoated tools is inversely proportional to the thickness of the slice. On the basis of the analysis of the studies on the issues of cutting with coated tools of ceramic material and the results of research presented in this paper, the conceptual role of the coating on the working surfaces of the ceramic tool was formulated, and it can serve as a scientific and technological basis for further improvement of the ceramic tool.

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