
Vadim ZakievNational Aviation University
Vadim Zakiev
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Publications (50)
The surface state of heatproof specimens of nickel-based СrNi73MoTiAlNb alloy after both wire electroerosion cutting (WEEC) with different applied energies and finishing high-frequency mechanical impact (HFMI) treatment by an ultrasonic tool is analysed. Using an optical interferometry and scan-ning electron microscopy, the peculiarities of the for...
To enhance the wear resistance of Ti-6Al-4V alloy, the alumina-reinforced protective coating was formed using a two-step modification process: ultrasonic impact treatment with simultaneous addition of alumina powders to the zone of severe plastic deformation (SPD) producing the mechanically mixed surface layer of composite and the following air-oxi...
A comparison of the effects of high-frequency hardening by balls (SMAT) and local high-frequency mechanical impact (HFMI) treatment by an impact element on the micromechanical characteristics and microstructure-phase state of the surface of the Ti6Al4V (ВТ6) alloy is carried out. The SMAT processing of the sample surface is carried out in the air f...
Changes in microhardness, structural-phase state, degree of the lattice microstrains, level of residual compressive stresses and tribological properties of stainless steel 40Х13 (AISI 420) after ultrasonic impact treatment (UIT) of surface layers in air and inert media have been studied. The increase in the surface microhardness of the samples trea...
In this study, a microtribological characteristics of Ni(25 nm)/Cu(25 nm)/ Cr(25 nm) three-layer thin films fabricated using DC magnetron sputtering are explored using progressive scratch test. Four various types of thin films are examined and compared: as-deposited film, film after low-energy Ar+ ion irradiation, film annealed at 450°С for 15 minu...
In this research, the corrosion behaviour of the Fe–C–Cr–B–Ti alloying system deposited alloys applied by flux-cored arc welding are studied. Samples of deposited alloy with a high content of chromium (13% by weight of Cr) received with self-shielded flux-cored wire electrode without exothermic additions are investigated. For comparison, the deposi...
The microstructure evolution of the 30MnB5 steel, tempered at the different temperatures, the micromechanical properties and wear resistance was studied.
The correlation between results of sclerometry and wear resistance of steel was found. Minimal work of plastic deformation (29.42·10-8 J) accompanies the maximal wear resistance of steel. This mak...
3D printing of porous SiO2–Al2O 3–Fe2O 3–MgO–CaO–Na2O glass products with use of the robocasting technique was comprehensively studied. Features in the preparation of glass-based pastes with gelatin or agar for 3D printing were established and recommendations on the printing of porous glass products employing a ZMORPH 3D prin ter equipped with a th...
The physical and mechanical properties of Cr(30 nm)/Cu(30 nm)/Ni(30 nm) thin filmsThin films magnetron sputtered on Si (001) were studied. A novel microtribological tests have been proposed to evaluate the wear resistance and adhesionAdhesion of the thin films. Microtribological characteristics such as coefficient of friction, wear resistance, and...
The strength of the cutting inserts coating significantly determines the tool wear and the quality of the machined surface. To determine the inserts coating strength, a new method of micromechanical evaluation was developed and tested. The method is based on multi-pass progressive sclerometry with a stepwise maximum indenter load increasing with ea...
We study the influence of admixtures of CrB2 powder on the mechanical (microhardness H and modulus of elasticity E) and tribological (wear resistance) characteristics of composite materials based on iron, copper, nickel, and tin sintered by the method of cold pressing with subsequent vacuum hot pressing. The source powders have the range of particl...
The structural features, hardness, elastic modulus, and wear resistance of Fe–Cu–Ni–Sn composites with different CrB2 contents, produced by cold pressing and subsequent sintering with additional hot pressing, were studied by X-ray diffraction, scanning electron microscopy, microindentation, and tribological testing. The micromechanical and tribolog...
The microstructure evolution, mechanical properties, and tribological properties of deposited metal Fe-C-Cr-Ti-B alloy by self-shielded flux-cored wire electrode (FCAW S) with the introduction of exothermic addition and without it are investigated. Experimental studies showed that the introduction of CuO Al exothermic addition in the composition of...
This study focused on improving plasma-electrolytic oxidation (PEO) technology of aluminum alloys with the aim to increase their abrasive wear resistance. Using thermodynamic calculations of the reactions between hydrogen and aluminum oxides in solid, liquid and gaseous states, it is established that hydrogen (while in the channels of microplasma d...
The resistance to local fracture of brittle materials is currently characterized by the value of edge toughness. An “instrumented micro-edge chipping” (IMEC) is proposed and tested. This test was carried out on various brittle materials: light krone glass LK-5, polycrystalline silicon Si, partially stabilized dioxide zirconium ceramic TS and tetrag...
The influence of CrB2 additive (within the interval ranging from 0 to 8 wt%) on the formation of structure of the diamond–matrix transition zone and the matrix material, microhardness, elastic modulus, retention of diamond grains in Fe–Cu–Ni–Sn matrix material and wear resistance of sintered diamond-containing composites (DCCs) by the powder metall...
The structure, phase composition, hardness, and elasticity modulus of sintered Fe—Cu—
Ni—Sn—CrB2 composites and their tribological properties under dry and wet friction have been studied
by X-ray diffraction, scanning electron microscopy, microindentation, and tribological testing. The
obtained results have demonstrated that the microstructure and...
Using the method of powder metallurgy, we studied the effect of CrB2 additives (0–8 wt %) on the formation of the structure of the diamond–matrix transition zone and the matrix material, microhardness, elastic modulus, and fixation of diamond grains in a Fe–Cu–Ni–Sn matrix and determined the wear resistance of sintered composite diamond-containing...
Comprehensive research into the production of a ceramic-reinforced polymer material from highdensity polyethylene or polypropylene and β-Si3N4 powder was conducted. The incorporation of silicon nitride ceramic particles (5 and 10 vol.%) into the polymers to make polymer–ceramic filaments was studied step by step. High-quality polypropylene–ceramic...
This work focuses on the characterization of the microstructure and anti-oxidation properties of the composite coating synthesized on Ti6Al4V alloy. This protective composite coating was produced using sequentially applied severe plastic deformation of the near-surface layers by ultrasonic impact treatment with simultaneous addition of the reinforc...
The structure, phase composition and mechanical properties of composite
coatings synthesized by ultrasonic impact treatment (UIT) of surface layers
of two-phase Cu39Zn1Pb brass with the addition of Al2O3, SiC and β-Si3N4
powders are investigated. Due to the intense plastic deformation caused by
the UIT, there is a partial grinding and incorporation...
The effect of the addition of CrB2 in the amount of 0 to 8 wt % on the microstructure,
microhardness, elastic modulus, friction coefficient, and wear resistance of the Fe–Cu–Ni–Sn composites formed by cold pressing and subsequent sintering with hot pressing is investigated. It is found
that an increase in the content of CrB2 in the composition of t...
The regularity of glass surface fracture and resistance to destruction were investigated by the methods of progressive and static microscratching with the Berkovich indenter. The research hardware was the original nanoindentation/microscratching devices and a non-contact interference profilometer for studying the morphology of the formed microscrat...
The mechanical (hardness and elastic modulus) and tribological (friction force and wear rate) properties of the Fe–Cu–Ni–Sn–VN composites produced by cold pressing and subsequent vacuum hot pressing at different temperatures are studied. The starting iron, copper, nickel, and tin powders have 5–50 μm particles and the vanadium nitride powder has 0....
The paper discusses the results of the tool-life tests of PCBN cutting tool with PVD coating and the mechanism which could be accounted for declining of its wear rate. The results of research showed that in condition of finishing of hardened steel (52–54 HRC), PCBN with (TiAlSiY)N/CrN PVD coating demonstrated significantly lower wear rate parameter...
The processes of structure formation, mechanical and tribological properties under vacuum hot pressing of a blend of powders of iron, copper, nickel and tin with a dispersion of 5–50 µm with the addition of a nanopowder of vanadium nitride depending on temperature are described. It was found that an increase in sintering temperature from 800 to 100...
The results of studies aimed at improving the mechanical and operational properties of the FeCuNiSn and FeCuNiSnVN composite materials obtained by powder metallurgy methods are presented. A comparative analysis of mechanical and tribological characteristics, including the determination of nanohardness, elastic modulus, friction force, fricti...
At the stage of dental implants in patients with metabolic Osteopaths are often ignored issues of architectonic changes, microstructure, mineral saturation and biological potential of bone tissue, which is one of the causes of failures. The problems of structural and biomechanical changes in bone metabolic osteopathy on the background of generalize...
The present paper considers the problem of the low-temperature deposition of the hard coatings on the alloys having a low melting point and a high affinity for oxygen, like aluminum or magnesium alloys. It is demonstrated that a hard ZrN coating can be produced on the 2024 aluminum alloy by the low-temperature vacuum-arc deposition method. To achie...
We study the chemical and structural inhomogeneities and the parameters of wear resistance of the coatings obtained by the arc-welding method. The coatings were obtained from PR-KhN80SSR3, PN-AN-34, and Kh17N8S6G powders based on nickel, cobalt, and iron, respectively, and from an experimental powder based on Ni and Fe. The tribological properties...
A heterogeneous electric arc coating consisting of matrix phase Feγ lamellas and complex oxides of
iron and chromium are formed as a result of electric arc spraying of powdered wire PD280X21SCGMP. The
content of chromium in the coating lamellae varies from 16.4 to 20.3 wt. % with a typical content of 20.23 wt. %
It is shown that the distribution of...
The surface strengthening mechanisms of the 15Kh2MFA(II) heat-resistant steel are analyzed after the laser shock-wave treatment in the air and epoxy resin. The regularities are established in the formation of the ordered surface relief of the steel after treatment. The optical and digital analysis of the surface is performed which allows determinin...
Physical-mechanical characteristics of the tibiae in mature and elderly rats on the 24th day after a fracture in conditions of taking increased doses of heavy metal salts by the animals were studied with help of the method of kinetic indenting. In the experimental conditions, a decrease of hardness and worsening of elastic properties of bones after...
The present work is devoted to investigation of structure formation and mechanical properties of Ti-2.5 Si, Ti-2.5 Si-1.0 Zr, Ti-2.5 Si-3.0 Zr and Ti-2.5 Si-5.0 Zr alloys after face quenching from 1300°C. Examination of structure of quenched alloys using optical and transmission electron microscopy showed that the structure in zones near faces of s...
The nanoindenting method is based on the automatic measurement and recording of the force acting on the indenter (10−2-5 N) and the depth of indentation (10−2-200 µm). The scratch hardness or nanoscratching method is based on the continuous recording of resistance forces to movement
of the indenter impressed into the surface.
Investigation of physical-mechanical characteristics of stomatologic materials (ceramics for crowns, silver amalgam, cements and materials on a polymeric basis) properties by the modern methods and correspondence their physical-mechanical properties to the physical-mechanical properties of native teeth is represented. The universal device "Micron-G...
Розглянуто інтерферометричні методи аналізу поверхні. Запропоновано автоматичний метод безконтактного тривимірного профілювання поверхні.
Рассмотрены оптические бесконтактные интерференционные методы измерения геометрических вели-чин и анализа микропрофиля поверхностей. Приведены методы модернизации и автоматизации для трехмерного анализа микронеровностей.
Investigation of physical-mechanical characteristics of stomatologic materials (ceramics for crowns, silver amalgam, cements and materials on a polymeric basis) properties by the modern methods and correspondence their physical-mechanical properties to the physical-mechanical properties of native teeth is represented. The universal device "Micron-G...