UDC 539.89
K. V. Slipchenko1, *, D. A. Stratiychuk1, **, V. Z. Turkevich1, N. M. Bilyavyna2, V. M. Bushlya3, Ya.-E. Shtol3
1V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
2Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
3Lund University, Lund, Sweden
*kateslipchenko@gmail.com
**d_strat@ukr.net
Sintering of materials based on cBN with a TaC bond for metal-cutting tools (pp. 3-11)
Ceramic-matrix composites based on cubic boron nitride with a TaC bond were manufactured under high pressure and temperature conditions. Sintering was carried out in a high-pressure apparatus of the “toroidal” type in the temperature range of 1450–2450 °C. It was shown that at sintering temperatures above 2150 °C, chemical interaction occurs between the components of the mixture with the formation of TaV2. The microhardness of the composites increases with increasing sintering temperature and reaches its maximum (34 GPa) at 2150 °C. Under conditions of high-speed machining of the nickel alloy Inconel 718, the composites had high resistance to mechanical and chemical wear.
Keywords: tantalum carbide, boron nitride, microhardness, high pressure.
UDC 62-987:621.921.34
O. V. Bovsunivsky*, S. B. Polotnyak, V. V. Lysakovsky, O. O. Leshchuk, S. O. Ivakhnenko
Institute of Superhard Materials named after V. M. Bakulya NAS of Ukraine, Kyiv, Ukraine
*olesbov@gmail.com
Computer modeling of stress-strain and limit states of a pyrophyllite container and punches of a six-punch high-pressure apparatus (pp. 12-23)
A finite element method for determining the mechanical state of heavily loaded elements of a six-punch AHT has been developed. The process of compression of a pyrophyllite container in a six-punch AHT has been studied. The stress-strain and limit states of the container and punches in the process of high pressure generation have been determined, the influence of the size of the edge of a cubic container on the limit state of the punches and the level of pressure generated in the AHT has been established. In particular, an increase in the length of the container edge leads to a decrease in the pressure value in its center.
Keywords: six-punch high-pressure apparatus, pyrophyllite container, carbide punch, pressure, diamond, computer modeling, finite element method, stress-strain state, limit state.
UDC 539.23:620
O. O. Onoprienko*, V. I. Ivashchenko, P. L. Skrynskyi, O. K. Synelnichenko, A. O. Kozak, A. M. Kovalchenko, O. I. Olifan
Institute for Problems of Materials Science named after I. M. Frantsevich, NAS of Ukraine, Kyiv, Ukraine
*onopr@ipms.kiev.ua
The Effect of Nitrogen on the Microstructure, Hardness, and Tribological Properties of Cr–Ni–B–C–N Films Deposited by DC Magnetron Sputtering (pp. 24-35)
Cr–Ni–B–C–N films were deposited on silicon substrates by the DC reactive magnetron sputtering method of simultaneously two Cr–Ni and B–C targets in an Ar/N2 gas mixture. The microstructure, chemical bonds, hardness, and tribological properties of the films were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, microindentation, and tribological testing. The results showed that the microstructure and mechanical properties of the films changed upon addition of nitrogen to the films. Cr–Ni–B–C–N films consisted, as a rule, of a nanocrystalline CrN phase with a NaCl-type structure and also contained a certain fraction of crystalline Ni, Cr2O3 and B2O3 phases immersed in a mixed amorphous phase. The addition of nitrogen led to an increase in hardness to a value of ~ 17 GPa at FN2 = 40 cm3/min, and with an increase in FN2 above 40 cm3/min, the hardness decreased sharply. The presence of nitrogen in the film structure led to an improvement in tribological properties and an increase in adhesion of the films to the silicon substrate.
Keywords: magnetron method, nanocomposite, structure, mechanical properties.
UDC 621.793.182
G. Fagany1, S. M. Rabii2, *, S. Nowrouzy2, Kh. Elmhag3
1Technological University named after Babol Noshirvani, Mechanical Engineering Faculty, Babol, Iran
2Technological University named after Babol Noshirvani, Department of Materials Science, Babol, Iran
3Buali-Sina University, Department of Materials Science, Hamedan, Iran
*rabiee@nit.ac.ir
Nanoscale multilayer thin coating produced by the method of cathodic arc evaporation (p. 36-49)
Single-layer coatings of TiN and CrN, as well as nanoscale multi-layer thin coatings of TiN/CrN, deposited on substrates made of stainless steel 420C by the method of cathodic arc evaporation, were studied. The nanoindentation test showed that the hardness of the nanoscale multilayer TiN/CrN thin coating was 30 GPa, which is greater than that of single-layer coated TiN (HTiN = 23 GPa) and CrN (HCrN = 19 GPa). Ball-on-disc tribometer and Rockwell-C detection methods showed better abrasion resistance of the nanoscale multi-layer TiN/CrN coating and better adhesion strength of the single-layer CrN coating compared to the other investigated samples. Nanoscale multilayer thin TiN/CrN coating on stainless steel 420C can be used in tribological systems where high hardness and wear resistance are required, as well as low coefficient of friction.
Keywords: TiN/CrN multilayer coating, nanoindentation, hardness, wear resistance, stainless steel 420C.
UDC 666.3:539.5
T.B. Serbeniuk*, T. AT. Prikhna, V. B. Sverdun, N. IN. Sverdun, V. AND. Chasnyk, M.IN. Karpets, V. IN. Kovyliaev
Institute of Superhard Materials named after IN.M.Bakulya National Academy of Sciences of Ukraine, m. Kyiv, Ukraine
*serbenuk@ukr.net
The influence of technological conditions for obtaining composite materials based on AlN–Y2O3–C on their ability to absorb microwave radiation (pp. 50-56)
For application in the field of vacuum electronics as absorbers of microwave radiation, new composite materials based on AlN–Y2O3–C have been created. X-ray phase and structural studies have shown the presence of the main phases in the structure of the composite: AlN (hexagonal and cubic), Y3Al5O12, Al3O4 and C. It has been established that increasing the mixing and grinding time of the initial components affects both structure formation, namely, an increase in the Al3O4 phase, and an increase in the attenuation of microwave radiation of the composites from 6.5 to 7.6 dB, which characterizes an increase in the absorption capacity of the obtained ceramics.
Key words: composite, AlN, carbon black, microstructure, microwave radiation, crystal lattice parameters, absorber material.
UDC 666.539.3/6 (045)
AND. G.Dovhal*, V. IN. Varyukhno, L. B. Adoptee
National Aviation University, Kyiv, Ukraine
*kalibr201@ukr.net
The influence of structural formation of composites of the SiC–Al2O3 system with various activation additives on their strength and hardness (p. 57-64)
The influence of the composition and activation additives on the structure of the SiC–Al2O3 system composite was investigated. The density, porosity and morphological features of the structure were studied. The physical and mechanical properties of the obtained samples, such as bending strength and hardness, were investigated. The optimal values of these characteristics are established relative to the compositions and technological modes of production.
Keywords: SiC–Al2O3 composite, strength, hardness, density, porosity.
UDC 669.018.25
M. M. Prokopiv
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
keramtex@ukr.net
Formation of a layered structure on the surface of a hard alloy 79WC–15TiC–6Co upon interaction with a TiC–20Ni powder mixture (pp. 65-72)
The structure of the surface of a cutting insert made of a standard hard alloy (Ti,W)C–WC–6Co of the T15K6 brand after interaction with a TiC–Ni-based powder mixture was studied. It was shown that an outer layer with two-phase (Ti,W)C–(Co, Ni) and intermediate (Ti,W)C–WC–(Co, Ni) structures of variable composition is formed on the surface of the insert. The formation of the layered structure occurs as a result of the diffusion of Co, W, C from the volume of the plate to its surface and the counter-diffusion of Ni from the surface of the plate into the volume.
Keywords: hard alloy, carbides WC, (Ti,W)C, bond, Co, Ni, layer, structure.
UDC 621.9.025.77:615.46:616.728
S. V. Sokhan*, A. L. Maistrenko, V. G. Sorochenko, V. V. Vozny, O. I. Borymsky, M. P. Gamanyuk, E. M. Zubanev
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
*svsokh@gmail.com
The influence of the processing mode on the diamond finishing indicators of boron carbide ceramic balls (pp. 73-85)
The influence of the processing mode on the diamond finishing process of boron carbide ceramic balls was experimentally investigated, the indicators of which are the rate of allowance removal, the rate of decrease/increase in the deviation from the spherical shape of the balls, and the different sizes of the diameters of the balls in the batch. To isolate the share of a specific indicator caused by the influence of the processing mode, the method of approximation of the change in time of this indicator was applied, and the specified share at any time was determined as the difference between the values from the experiment and from the approximation function. It was found that the separated particles can change both in the direction of increase and decrease depending on the finishing conditions: the processing mode (product of the pressing force of the finishing disk and the cutting speed), the direction of decrease in the diameter of the balls in the separator relative to the direction of rotation of the lower disk and the frequency of feeding the diamond suspension. The most effective combination of the studied factors for correcting the deviation from the spherical shape and reducing the heterogeneity of the diameter of the balls in the batch was determined.
Keywords: ceramic balls, boron carbide, diamond finishing, pressing force of the finishing disk, cutting speed, frequency of feeding the diamond suspension, diameter and deviation from the spherical shape of the balls, heterogeneity of the diameter of the balls in the batch.
UDC 621.921.34-492.544.023.5:539.215
G. A. Petasyuk, O. O. Bochechka*
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
*petasyuk@ukr.net
**bochechka@ism.kiev.ua
Homogeneity of abrasive powders by the shape of the grain projection and the method of its determination (pp. 86-97)
Based on the analytical analysis of well-known publications, the methodological development of the concept of homogeneity of abrasive powders as an important sign of their quality is investigated. The characteristics and properties to which the concept of homogeneity can be applied are distinguished.
ness. It is proposed to add a new morphometric characteristic to this list – the shape similarity of the grain projection. An original method for determining the homogeneity index of abrasive powders by this characteristic is presented. The results of testing the method on different abrasive powders are presented.
Keywords: abrasive powders, shape similarity, homogeneity by the shape similarity of the grain projection.
UDC 666.3:539.5
Yu. Yu. Rumyantseva1, *, L. O. Romanko1, D. V. Chasnyk2, V. Z. Turkevich1, V. M. Bushlya3, I. P. Fesenko1, O. M. Kaidash1, V. I. Chasnyk4, V. P. Rukin4
1V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
2Ukrainian Research Institute of Special Equipment and Forensic Examinations of the Security Service of Ukraine, Kyiv, Ukraine
3Lund University, Lund, Sweden
4State Enterprise “Orion Research Institute”, Kyiv, Ukraine
*yrumuanceva@gmail.com
Electrophysical Characteristics of Thermobarically Sintered cBN–NbN Composite (pp. 98-101)
The structure, phase composition and temperature dependence of the electrical resistivity of the cBN–NbN composite obtained by sintering under high pressure are reported. The semiconductor nature of the change in electrical resistivity from 2.5 to 1.8 Ohm·cm in the range of 300–700 K is established.
Keywords: thermobaric sintering, cubic boron nitride, niobium nitride, electrical resistivity, temperature.