UDC 620.22:669.018.25
AND. F. Lysovsky, N. AND. Bondarenko* (Kyiv)
*lisovsky@ism.kiev.ua
**bond@ism.kiev.ua
The role of interfacial and contact surfaces in the formation of the structure and properties of the diamond–(WC–Co) composition. Overview (pages 3-17)
An analysis of published works devoted to theoretical and experimental studies of the formation of the structure of interphase and contact surfaces, as well as their influence on the properties of the diamond–(WC–Co) composition, was carried out. The composition and structure of WC/WC, WC/Co, diamond/(WC–Co) surfaces are described, the technologies that allow influencing the formation of the structure of these surfaces are considered, and the paths of further research in this area of materials science are suggested.
Keywords: composite materials, structure, interfacial surfaces.
UDC 553.81(571.56)+621.762.4.045:621.921.34
AND. AND. Shulzhenko (Kyiv)
THERE ARE. THERE ARE. Ashkinazi* (Moscow)
AND. N. Sokolov**, G. AND. Petasiuk, L. I. Alexandrova, V. G. Gargin (Kyiv)
IN. G. Ralchenko, D. N. Sovyk, V. I. Konov (Moscow)
IN. N. Tkach, N. N. Beliavyna, V. WITH. Shamraeva (Kyiv) *jane50@list.ru
**kybor@ism.kiev.ua
The structure and properties of impact diamonds of the Popygai deposit and polycrystals made from them (pp. 18–28)
The properties of impact diamonds of the Popygai deposit in the free state and in the composition of the compact were investigated. Micro-Rad spectra of initial micropowders and polycrystals sintered under HPNT conditions both in the presence of additives activating the sintering process and without them were obtained. The hardness of HV sintered polycrystals was determined, structural changes in the crystal lattice of diamonds depending on the sintering conditions were studied.
Key words: impact diamond, high pressure, sintering, hardness, morphometric parameter, Raman light scattering.
UDC 666.233
AND. P. Wozniakovsky, V. Yu. Dolmatov, F. AND. Shumylov (St. Petersburg)
*voznap@mail.ru
**diamondcenter@mail.ru
***itachi16@mail.ru
The influence of detonation synthesis conditions on the surface characteristics of detonation nanodiamonds (pp. 29–35)
The influence of detonation synthesis conditions on the surface properties of detonation nanodiamonds is considered. It has been experimentally shown that the introduction of modifying elements into the charge armor and into the charge itself is a promising way to obtain an ensemble of detonation nanodiamond particles with predefined surface characteristics.
Keywords: detonation synthesis, detonation nanodiamonds, synthesis control, modifying elements.
UDC 621.921.34-419
D. AND. Savchenko, E. AND. Pashchenko*, O. IN. Lazhevskaya,
AND. N. Chernenko, A. IN. Malyshev, E.AND. Naydyuk (Kyiv)
*denissavchenko@inbox.ru
**lab6_1@ism.kiev.ua
Engineering of the free volume of polymers in abrasive instrument composites (pp. 36–47)
The influence of synthetic diamond powder as a filler on the mechanical properties of polyhydroxophenylene containing copper in the form of clusters incorporated into the polymer network was studied. The interrelationship between dispersity and filler content with the characteristic of polymers – free volume – is shown. It has been proven that the retention of diamond grains in the composite depends on the dynamics of migration of free volume elements.
Key words: copper-containing polyhydroxophenylene, free volume, diamond powder, migration, instrumental stability.
UDC 537.312.62
AND. IN. Shaternik, A. P. Shapovalov, T.AT. Prikhna* (Kyiv)
*shapovalovap@gmail.com
**prikhna@mail.ru
The influence of technological parameters of deposition on the transparency distribution functions of Josephson junction barriers (pp. 48–56)
The charge transport in superconductor–insulator–superconductor junctions has been studied. The use of a superhard material – leucosapphire – as substrates to create Josephson junctions has made it possible for the first time to obtain a relationship between the technological parameters of the process of deposition of junction layers, the barrier structure and model parameters of charge transport in these junctions. The results of experimental studies of nanoscale structures created on the basis of thin films of MoRe superconductors have been considered. The charge transport in these heterostructures is analyzed within the framework of a modified theoretical model of multiple Andreev reflections taking into account the transparency distribution function of the barrier. This approach allows us to describe the evolution of the shape of real current-voltage characteristics of heterostructures depending on the technological conditions of their manufacture.
Key words: Josephson transition, Andreev reflection, superconductor, barrier transparencies distribution function, leuco sapphire.
UDC 539.216:621.762
IN. IN.Ivzhenko* (Kyiv)
AND. AT.Kryl, Ya. AND.Kryl (Ivano-Frankivsk)
AT. N.Kaidash, A. AND. Leshchuk, S. N.Dub, H. F.Sarnavskaya (Kyiv)
*ivv@ism.kiev.ua
Investigation of aeroabrasive wear of hot-pressed materials of the B4C–TiB2 system (pp. 57–64)
The results of studies of aeroabrasive wear of hot-pressed materials of the B4C–TiB2 system at different angles of attack of abrasive particles are presented. It is shown that the phase ratio in the composite significantly affects the wear resistance of materials. Educated ie 5–10% (by mass) of titanium diboride in the B4C composite provides high wear resistance due to an increase in the fracture toughness of KIc from 3.8 to 4.4–5.3 MPa·m1/2 while maintaining high hardness (HV = 20–23 GPa).
Key words: air abrasive wear, hot-pressed materials, B4C, TiB2, wear resistance.
UDC 661.657.5-492.2:621.922.025
IN. AND. Lavrinenko, B. IN. Sytnyk, V. G. Poltoratskyi, O. AT. Bochechka* (Kyiv)
IN. Yu. Malt (Dneprodzerzhinsk)
*ceramic@ism.kiev.ua
**bochechka@ism.kiev.ua
Composites based on CBN micropowders structured by a carbon bond as functional elements in the structure of the working layer of a diamond abrasive tool. 1. Grinding powders from composites as abrasive elements (pp. 65–72)
The formation of composites structured by a carbon bond from finely dispersed cubic boron nitride micropowders is described, and the possibilities of their use as abrasive elements in the working layer of grinding wheels are investigated to achieve the required operational characteristics of the wheels in grinding processes.
Keywords: composites, micropowders, abrasive elements, working layer, grinding wheel.
UDC 621.924.93
A. F. Salenko*, V. T. Shchetinin, A. N. Fedotyev (Kremenchug)
*salenko2006@ukr.net
Increasing the accuracy of contour hydroabrasive cutting of plates from hard alloys and superhard materials (pp. 73–84)
The questions of the perspective of the application of hydroabrasive cutting for the processing of instrumental composites: hard alloys, cutting ceramics, superhard materials based on cubic boron nitride are considered. Problems accompanying this process are analyzed.The expediency of using multi-pass processing for obtaining precise profile cuts of carbide materials with the use of a variable working feed is shown. Prospective directions for further research are established to obtain regularities in the quality of the machined surface depending on cutting modes and the type of abrasive used.
Key words: hydroabrasive cutting, hard alloys, superhard materials, processing accuracy, process model, multi-pass processing.
UDC 621.793.7:621.9.025.7
WITH. AND. Klymenko*, I.AND. Podchernyaeva, V. M. Beresnev, V. M. Panashenko, S. An. Klymenko, M. Yu. Kopeykina (Kyiv)
*atmu@ism.kiev.ua
Ion-plasma coating AlN–(TiCr)B2 for a cutting tool made of polycrystalline superhard material based on cubic boron nitride (pages 85–97)
The microstructure and oxidation kinetics of the surface layer of the AlN–(TiCr)B2 coating, obtained by the method of magnetron HF sputtering, in the processes of its formation and application in a tool made of polycrystalline superhard materials based on cubic boron nitride during processing of hardened ShX15 steel, were investigated. The coating is formed with the participation of a predominantly liquid phase. After processing by cutting, the formation of a two-layer tribofilm with a nano-sized polyoxide outer layer was found on the surface of the cutting plate. Using layer-by-layer Auger analysis, the phase composition of the tribofilm was estimated. Its outer nano-sized layer is a glass-like phase in the form of solid solutions of oxides based on Fe2O3–Al2O3, which plays the role of a solid lubricant. As the cutting speed increases, the rate of wear of the tool with the coating decreases compared to the tool without the coating.
Key words: cutting tool, ion-plasma coating, composite ceramics, tribofilm, wear resistance.