Frontier materials & technologies最新文献

{"title":"The study of influence of temperature and speed conditions on the mechanical properties of bioresorbable Zn–4Ag–Cu zinc alloy during equal-channel angular pressing","authors":"E. Fakhretdinova, E. Khafizova, R. Asfandiyarov, G. Raab, R. Islamgaliev, A. Semenov","doi":"10.18323/2782-4039-2022-3-2-68-78","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-3-2-68-78","url":null,"abstract":"Recently, innovative medical techniques for restoring lost functions of patients have been actively developed, in which the use of bio-soluble (bioresorbable) materials is of particular importance. Such materials include alloys based on Mg, Fe, and Zn, and can significantly reduce the cost of surgical operations and shorten the duration of treatment. However, these metals have such disadvantages as insufficient strength and increased fragility to be used in medical implants. Therefore, increasing the mechanical characteristics of bioresorbable alloys is an urgent problem. In this work, the authors solve this problem using an advanced method of plastic treatment – severe plastic deformation (SPD), which, due to active initial structure refinement to nano- and ultrafine state, allows effective improvement of the mechanical strength of metal materials. The authors used the most effective and well-spread SPD method –equal-channel angular pressing (ECAP). The paper presents the results of computer ECAP research of Zn–4Ag–Cu zinc alloy at different deformation rates (0.4 and 7.8 mm/sec) and temperature conditions (150, 200 °C) chosen based on equipment performance potential and conditions to ensure thermal stability of the structure. The patterns of distribution of accumulated deformation degree, deformation rate, average stress values, and temperature-force conditions are obtained. According to the results of computer modeling, the authors recommended carrying out ECAP processing at the temperature of 150, 200 °C and a speed of 0.4 mm/s, which ensures a uniform thermal field at the deformation zone. During the experimental work according to the selected modes, the authors obtained samples after four ECAP cycles, which had advanced mechanical properties improving performance characteristics. The increased strength will allow minimizing the implants’ sizes ensuring less trauma during their installation and faster dissolution in the physiological environment of the body when retaining functionality.","PeriodicalId":251458,"journal":{"name":"Frontier materials & technologies","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133315736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristic properties of the microstructure and microtexture of medium-carbon steel subjected to sulfide stress cracking","authors":"A. Malinin, V. Sitdikov, V. E. Tkacheva, A. Makatrov, I. V. Valekzhanin, A. Markin","doi":"10.18323/2782-4039-2023-1-33-44","DOIUrl":"https://doi.org/10.18323/2782-4039-2023-1-33-44","url":null,"abstract":"Increasing the resistance of steel products to sulfide stress cracking (SSC) is one of the topical issues of the oil and gas industry. Among various factors determining the SSC resistance of a material is the structure-phase state of the material itself and the crystallographic texture associated with it. This paper analyzes these features using the scanning electron microscopy (SEM), transmission electron microscopy (TEM), and microroentgen electron backscattered diffraction (EBSD) techniques. As the research material, a production string (PS) coupling made of medium-carbon steel was selected, which collapsed by the mechanism of hydrogen embrittlement and subsequent SSC. For the first time, by the SEM method, using the location and mutual orientation of cementite (Fe3C) particles, at high magnifications, the authors demonstrated the possibilities of identifying the components of upper bainite, lower bainite, and tempered martensite in steels. The presence of the detected structural components of steel was confirmed by transmission electron microscopy (TEM). Using the EBSD method, the detailed studies of microtexture were conducted to identify the type and nature of the microcrack propagation. It is established that the processes of hydrogen embrittlement and subsequent SSC lead to the formation of {101} <0¯10>, {100} <001>, {122} <2¯10>, {013} <211>, {111} <¯100>, {133} <1 ̅2 ̅1>, {32 ̅6 ̅} <201> grain orientations. It is shown that the strengthening of orientations of {001} <110>, {100} <001>, {112} <111>, and {133} <1 ̅2 ̅1> types worsens the SSC resistance of the material. Using the EBSD analysis method, the influence of coincident site lattice (CSL) grain boundaries on the nature of microcrack propagation is estimated. It is found that the Σ 3 CSL grain boundaries between the {122} <2¯10> and {111} <¯100>, {012} <1 ̅1 ̅0>, {100} <001> plates of the upper bainite inhibit the microcrack development, and the Σ 13b, Σ 29a, and Σ 39a CSL grain boundaries, contribute to the accelerated propagation of microcracks. For comparative analysis, similar studies were carried out in an unbroken (original) coupling before operation.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133500562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE INFLUENCE OF FRICTION STIR WELDING CONDITIONS ON THERMAL STABILITY OF АА6061 ALLOY","authors":"A. Kalinenko, S. Mironov, I. Vysotskiy, S. Malopheyev","doi":"10.18323/2782-4039-2022-1-31-39","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-1-31-39","url":null,"abstract":"Friction stir welding (FSW) is an innovative technology for the solid-phase joining of metal materials. It allows producing permanent joints of materials conventionally considered to be nonweldable, in particular aluminum alloys. However, an essential drawback of FSW is the relatively low stability of the stir zone microstructure. In particular, during post-weld heat treatment, seams frequently demonstrate abnormal grain growth. Such an undesirable phenomenon is often interpreted in terms of the so-called Humphrey’s cellular model, according to which the abnormal behavior is attributed to the essential microstructure refinement and the dissolution of the second-phase particles occurring during FSW. Since these two processes significantly depend on the temperature, the authors suggested that the thermal stability of the produced FSW seams should also be associated with the FSW heat conditions. To test this hypothesis, the authors obtained two welded seams at different FSW conditions and then studied their microstructural behavior during T6 mode thermal treatment (involving solution heat treatment followed by artificial aging). The authors used the advanced electron backscatter diffraction technique (EBSD) to investigate microstructure. In full accordance with the initial idea, the investigation showed that microstructural evolution in both studied microstructure states varied wildly. Specifically, the study identified that the reduction in the FSW temperature causes the suppression of abnormal grain growth. The authors suggested that the enhanced thermal stability of the material is associated with the conservation of the second-phase particles during the low-temperature FSW.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115535257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The formation of PEO coatings on the superelastic Ti–18Zr–15Nb alloy in calcium-containing electrolytes","authors":"R. Farrakhov, V. Aubakirova, M. Gorbatkov, Y. Lebedev, E. Parfenov","doi":"10.18323/2782-4039-2022-3-2-56-67","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-3-2-56-67","url":null,"abstract":"The paper discusses the influence of the electrolyte composition on the characteristics of a biocompatible coating produced by plasma electrolytic oxidation (PEO) on titanium superelastic shape memory alloy Ti–18Zr–15Nb. The scientific novelty of the work is in the identification of the most effective electrolyte composition to form a PEO coating with improved functional properties for advanced metal implants. Having important scientific and social significance, the scientific results of the work will serve as the basis for the development of modern technologies for the production of new-generation implants for orthopedy and neurosurgery. To identify the most effective electrolyte composition, the authors studied the morphology and microstructure of coatings, phase and elemental composition, adhesive properties, and surface wear resistance; carried out electrochemical corrosion tests. The resulting coatings have a thickness in the range of ~15.5–17 µm, and porosity of ~12–18 %. The additive in the form of sodium silicate significantly smooths the surface and increases wear resistance, but, at the same time, reduces the adhesive properties of specimens. The coatings contain biocompatible calcium phosphate compounds, which is confirmed by the presence of an amorphous halo between ~25° and ~40° in the results of X-ray phase analysis and the identified elements Ca and P in elemental analysis. The electrochemical impedance spectroscopy results identified the difference in the structure of PEO coatings and the corrosion processes occurring in them. Coatings formed in phosphate electrolytes have two layers: the external porous and internal compact, and in the phosphate-silicate electrolytes – a single layer. The study identified that plasma-electrolytic oxidation reduces corrosion currents by 1–3 orders compared to a specimen without PEO treatment. The coating formed in a phosphate electrolyte with the addition of boric acid and calcium acetate has the best corrosion characteristics and the highest roughness, which positively affects biocompatibility. This electrolyte can be recommended for further research as the most effective one.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":" 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113948102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of damages formed in polymer composite materials under bending loading and their identification by the acoustic emission technique","authors":"A. Bryansky, O. Bashkov, I. Belova, T. Bashkova","doi":"10.18323/2782-4039-2022-2-7-16","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-2-7-16","url":null,"abstract":"Polymer composite materials (PCM) reinforced with glass fibers are very important in many industries due to their unique properties (high chemical resistance and specific strength) with the economic efficiency of use. At the same time, the application of glass fabrics as reinforcing elements ensures high manufacturability. However, unlike crystalline materials, polymer composite materials are subject to the complex process of destruction, which requires the application of non-destructive control methods to get information about the nature of the resulting damage and the kinetics of their accumulation. The paper studies the deteriorations formed in the fiberglass samples molded using T-11-GVS-9 glass fabric and DION 9300 FR binder within static bending deformation accompanied by the acoustic emission (AE) method. In this work, the authors solved the problem of identifying the nature of damages in fiberglass using the Fourier spectra of the recorded AE signals. The authors used the clustering method to estimate their formation and development kinetics. Clustering was performed based on the Kohonen self-organizing map (SOM) algorithm using the values of peak frequencies of the Fourier spectra calculated for the recorded AE signals under static bending deformation of a fiberglass sample up to failure. To ensure the separability of the resulting damages according to the AE parameters, the authors used the loading rate that was ten times lower than that calculated according to the state standard. The study established that the application of frequency representation of AE signals recorded during the fiberglass destruction is effective when solving the task of identifying the nature of the resulting damages. As a result of the study, the authors found that the process of delamination formation during the bending of multilayer laminated plastics acts as a critical mechanism of destruction leading to a significant loss of the polymer composite strength properties.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128911930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The structure and mechanical properties of the AK12D (Al–Si–Cu–Ni–Mg) aluminum alloy subjected to friction stir processing","authors":"G. Khalikova, G. Zakirova, A. Farkhutdinov, E. Korznikova, V. Trifonov","doi":"10.18323/2782-4039-2022-3-2-99-108","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-3-2-99-108","url":null,"abstract":"The application of friction stir processing (FSP) to modify the structure of the Al–Si alloys, in particular the fragmentation of large silicon particles, can lead to an increase in the level of mechanical properties. This work is aimed to study features of local surface hardening of AK12D aluminum alloy (Al–Si–Cu–Ni–Mg system) during FSP and subsequent T6 hardening heat treatment. The authors investigated the influence of FSP and subsequent heat treatment parameters on the structure, microhardness, and hardness of the AK12D alloy. FSP was carried out at speeds of processing tool rotation and traverse of 2000 rpm and 8, 16 mm/min, respectively. The subsequent hardening T6 heat treatment was carried out according to the standard regime for the AK12D alloy. The paper shows that the FSP mode at a rotation speed of 2000 rpm and a traverse speed of 8 mm/min contributed to the formation of a monolithic and defect-free treatment zone. The study revealed that the formed microstructure is heterogeneous due to the influence of various thermomechanical effects. The most intense structural changes occurred in the stir zone. Friction stir processing and subsequent heat treatment led to fragmentation and partial dissolution of intermetallide particles in the α-Al solid solution followed by its decomposition and formation of secondary hardening phases. Moreover, the FSP and T6 heat treatment led to the formation of quasi-equiaxed fine-grained structure. The AK12D alloy microhardness after treatment under the study varied nonmonotonically and depended on the structure in different zones. At the same time, the Brinell hardness values after FSP and subsequent T6 heat treatment increased compared to the initial heat-treated state.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"16 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120845774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE COMPARISON OF THE MAIN TIME-FREQUENCY TRANSFORMATIONS OF SPECTRAL ANALYSIS OF ACOUSTIC EMISSION SIGNALS","authors":"I. Rastegaeva, I. Rastegaev, E. Agletdinov, D. Merson","doi":"10.18323/2782-4039-2022-1-49-60","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-1-49-60","url":null,"abstract":"Due to the intensive development of spectroscopic techniques for detecting acoustic emission signals, the problem of providing the best time-frequency resolution through the application of specific time-frequency transformation algorithms comes to the fore. The Short-Time Fourier Transform, the Wavelet Transform, the Smoothed Pseudo Wigner Distribution, the Choi-Williams Distribution, and the Hilbert-Huang Transform are currently the main time-frequency transformations used or integrated into the acoustic emission method. However, today in the literature, there is not enough information that allows evaluating time-frequency transformations regarding the effectiveness of their application to specify the features of discrete and continuous acoustic emission signals. On this basis, the authors carried out an experimental comparison of synthetic and actual model signals to determine the efficiency of specified time-frequency transformations. The synthetic model signals were a chirp signal, ideal sinusoids, and a Dirac delta function. The actual signals were a discrete acoustic emission signal from the Hsu Nelson source decomposed into dispersion modes in the acoustic channel and a continuous acoustic emission signal from the air outflow through a calibrated hole. The analysis shows that only the Fourier transform and the Wavelet transform can define all control features of model signals at the frequency components’ energy gap of about 25 dB. Wigner Distribution, Choi-Williams Distribution, and Hilbert-Huang Transform demonstrated higher time-frequency resolution did not identify frequency components of low energy. Therefore, the authors recommend using them to identify spectral changes in the resonance and discrete signals but in the narrow energy range. The Fourier transform and the Wavelet transform demonstrated the best result to analyze continuous acoustic emission. However, to use the latter, the procedure of selection of the optimal basis function is necessary. The study determined that the Hilbert-Huang transform allows identifying the frequency fluctuations, but it is necessary to develop ways to increase sensitivity and extract basic information from the spectrograms to enhance the validity of its results.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133004296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of mechanical and physical properties of a carbon nanotubes bundle under the transverse compression using a chain model with the reduced number of degrees of freedom","authors":"D. U. Abdullina, L. Galiakhmetova, Yu. V. Bebikhov","doi":"10.18323/2782-4039-2022-3-1-15-22","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-3-1-15-22","url":null,"abstract":"The paper studies a bundle of oriented carbon nanotubes (CNTs) under the transverse loading under the plane deformation conditions within the framework of a molecular dynamics model with a reduced number of degrees of freedom. The model takes into account CNT wall stretching and bending, as well as van der Waals interactions. Each CNT is represented by a ring of atoms with two degrees of freedom in the plane of the ring. The discrete nature of the model allows describing the large curvature of the CNT wall and the destruction of CNTs at very high pressure. CNT crystal equilibrium structures are obtained under the strain-controlled biaxial loading. Separate CNTs of a sufficiently large diameter have two equilibrium states: with a round and collapsed cross section. Small-diameter CNTs in the free state can only have a circular cross section. The study identified the presence of two phase transitions observed during biaxial compression of a CNT bundle. The first transformation similar to phase transition of the second order leads to ellipticization of CNT cross sections. As a result of the second transition of the first order, bundled CNTs appear in the beam, the proportion of which gradually increases with the increase in compressive strain. The authors calculated beam elasticity constants such as Young’s moduli, shear modulus, and Poisson’s ratios. The study shows that one of the equilibrium structures (with elliptical CNT cross sections) has the property of a partial auxetic, that is, it has a negative Poisson’s ratio under uniaxial loading in a certain direction. The proposed chain model can be effectively applied to analyze physical and mechanical properties of bundles of single-walled or multi-walled CNTs under the plane deformation conditions, and after simple modifications, it can be used to similar structures made of other two-dimensional nanomaterials.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134177654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal stability and corrosion resistance of ultrafine-grained high-entropy Fe30Ni30Mn30Cr10 alloy","authors":"K. Nesterov, R. Farrakhov, V. Aubakirova, R. Islamgaliev, A. R. Sirazeeva, A. Abuayyash","doi":"10.18323/2782-4039-2022-4-81-89","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-4-81-89","url":null,"abstract":"One of the promising research areas developing in recent times in the materials science is the development and research of high-entropy alloys containing several metal elements with the concentration close to equiatomic. The interest to them is generated by the fact that such alloys demonstrate the improved mechanical and functional properties. Another promising area improving strength of metallic materials is grain refinement using the severe plastic deformation methods. This work uses both approaches to form an ultrafine-grained (UFG) structure in the high-entropy Fe30Ni30Mn30Cr10 alloy. The paper presents the structure, strength, thermal stability, and corrosion resistance of a high-entropy alloy subjected to the high pressure torsion (HPT). The study of the structure carried out by scanning electron microscopy showed that the application of the HPT deformation leads to the formation of an UFG structure with an average grain diameter less than 200 nm depending on temperature of HPT processing. Microhardness measuring and tensile tests at room temperature showed that after grain refinement, an increase in microhardness and ultimate tensile strength occurs in a high-entropy alloy, which is more than three times higher compared to the initial coarse-grained sample. At the same time, the UFG samples of a high-entropy alloy manifested thermal stability of microhardness after annealing up to temperature of 500 °С. The electrochemical tests carried out in an aqueous solution of 3.5 % NaCl at the temperature of 37 °С demonstrated a high corrosion resistance of the UFG high-entropy alloy.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131230622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increasing the wear resistance of a radial bearing with a non-standard support profile and polymer coating on the shaft surface taking into account the pressure-viscosity ratio","authors":"Kh. N. Abdulrakhman, V. Kirishchieva, M. Mukutadze, V. Shvedova","doi":"10.18323/2782-4039-2022-4-9-17","DOIUrl":"https://doi.org/10.18323/2782-4039-2022-4-9-17","url":null,"abstract":"The paper covers the development and analysis of a model of the true viscous lubricant movement in the working gap of a radial sliding bearing with a non-standard support profile having a fluoroplastic composite polymer coating with a groove on the shaft surface. The authors obtained new models based on the classical equation in the approximation for the “thin layer” and the continuity equation describing the laminar pattern of movement of a lubricant with the viscous rheological properties. The results of the numerical analysis of the developed models allowed obtaining a quantitative assessment of the efficiency of the bearing bush support profile and the polymer-coated shaft with an axial groove. To complete the set of studies and verify theoretical insights, the authors carried out the experimental research. The novelty of the work lies in the development of an engineering calculation technique that allows determining the magnitude of the main tribotechnical parameters of a radial sliding bearing (hydrodynamic pressure, load capacity, and friction ratio) and expanding the area of practical application of the developed engineering calculations. The design of the radial bearing with a fluoroplastic antifriction composite polymer coating, a 3 mm wide groove, and a special support profile ensured the stable shaft ascent on the hydrodynamic wedge, which experimentally confirmed the correctness of the results of theoretical studies of sliding bearings with a diameter of 40 mm at a sliding speed of 0.3–3 m/s and a load of 13–65 MPa.","PeriodicalId":251458,"journal":{"name":"Frontier materials &amp; technologies","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124737672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}