UDC 679.826
G. V. Sakovich, V. F. Komarov, E. A. Petrov (Biysk, Russia)
Synthesis, properties, application and production of nanosized synthetic diamonds. Part 1. Synthesis and properties
An analysis of long-term studies of the synthesis of nanosized carbon particles with the formation of structures of various crystalline modifications from carbon atoms of explosive molecules and their preservation during cooling of explosion products with the superposition of the effect of reflected shock waves was performed. The resulting synthesis product was characterized by its main physicochemical properties: macro- and crystalline structure, particle size, their surface properties and reactivity.
UDC 666.233
A. A. Budyak, S. A. Ivakhnenko, S. V. Kovalchuk (Kyiv)
On the density of the diffusion flow of carbon in the initial period of growing diamond single crystals on a seed
The problem of electrical conductivity and thermal conductivity in high-pressure devices (HPD) and carbon diffusion in a metal-solvent during the growth of diamond single crystals by the T-gradient method is solved. The solution of the diffusion problem as a three-dimensional one made it possible to study the dependence of the density of the diffusion flow of carbon on the number and location of the seeds on the substrate. The pictures of the isolines of carbon concentrations are given for a number of typical schemes of heating the reaction cell in the presence of a central and (or) peripheral seeds.
548.73:539.216:621.921.34
Yu. I. Sozin (Kyiv)
Diffractometry of Coordination Spheres and Its Application to the Study of Superhard and Other Materials
The article reviews the results and prospects of more than a decade of development and various applications of diffractometry of coordination spheres (DSC) — a new scientific and methodological direction in solid state physics and structural analysis proposed by the author and based on the previously unknown X-ray diffraction spectrum from the coordination spheres of crystals that he discovered and the Ehrenfest equation that he rehabilitated. Some methodological aspects that have not received due coverage in previously published works are considered: the derivation and analysis of the Ehrenfest equation, a comparison of the calculated and experimental intensities of the components of the corresponding spectra, and the application of Fourier transforms to them.
UDC 548.73:549.211
V. N. Tkach (Kyiv)
On the anomalous temperature dependence of X-ray scattering by the diamond lattice
The change in the intensity profiles of the Kossel lines of natural diamonds and diamonds grown in the Ni-Mn-C system upon cooling the crystals to a temperature of 80 K was studied. In the temperature range of 300-170 K, anomalous scattering of X-rays (XR) by the lattice of diamond single crystals was detected. With a decrease in the crystal temperature, the peak intensity of the (111) line in CuKa1,2 radiation decreases, and the half-width of the lines increases by almost one and a half times. An assumption was made about the decisive influence of isomorphic impurity on the increase in the role of anharmonic vibrations in the lattice upon cooling diamonds.
UDC 621.793.1
V. G. Karolinsky, M. I. Sazonov, V. M. Khvisevich (Brest, Belarus) O. G. Krysin, V. V. Sheleg (Smorgon, Belarus)
Deposition of wear-resistant diamond-like films on a cutting tool using a vacuum-plasma unit
A vacuum-plasma unit (VPU-2) has been developed for producing diamond and diamond-like films by chemical vapor deposition using a high-temperature plasma jet. It has been shown that diamond-like films deposited by this method can increase the wear resistance of carbide plates by 6-10 times.
UDC 678.5.066.019.31:691.2/3
O. V. Lazhevskaya, E. A. Pashchenko, A. E. Shilo (Kyiv)
Thermodynamic Analysis of the Interaction of Epoxy-Containing Abrasive Composites with Concrete and Natural Stone Minerals in the Friction Zone
The features of the destruction of epoxy-containing composites in the zone of dynamic contact with the surface of natural and artificial building materials are considered. The possibilities of interaction of active low-molecular components released by abrasive composites in the cutting zone with concrete and natural stone minerals are analyzed. It is shown that free radicals and other active components are capable of initiating chemical and structural transformations in the surface layers of silicate and hydrosilicate materials.
UDC 538.975:539.231
V. I. Perekrestov, A. V. Pavlov (Sumy)
Formation of a multilayer unloading composite at the sodium-lime glass—TiC interface during ion sputtering of a composite target of Cr, C, and Ti
A structure-optimized unloading three-layer composite was formed between the surface of sodium-lime glass and a TiC-based coating using the ion sputtering method of a composite target of Cr, C, and Ti elements. Calculations and analysis of the chemical profile of the transition layer were performed.
UDC 621.922.079:678
S. V. Sokhan (Kiev)
Calculation of lap wear during diamond finishing of a spherical ceramic head
A numerical solution of a spatial non-axisymmetric contact problem is presented, taking into account the phenomena of friction and wear when using the method of successive approximations, as well as the calculation of the wear of the lapping as applied to the case of diamond finishing of a spherical ceramic head, when the undeformed profiles of the part and the lapping are matched to each other in shape and the contact of the bodies occurs along a spherical surface.
UDC 621.78.084:622.23.051.7
(Tula, Russia)
Research and application of heat treatment methods to improve the wear resistance of diamond rock-cutting tools
The mechanisms and main patterns of the influence of thermal shock on the characteristics of the structural state and properties of diamond-containing composite material are studied. Heat treatment in specified modes ensures the formation of an optimal level of compressive stress in the matrix, in the presence of which carbide particles and diamonds are held by the surrounding volumes of the binder not only due to adhesion forces, but also mechanically. The results of experimental drilling with crowns with different types of heat treatment are presented.
UDC 669.162.046.55
P. S. Kharlashin, V. A. Royanov, V. M. Baklansky (Mariupol) N. V. Novikov, L. N. Devin (Kiev)
Diffusion welding under pressure of superhard materials in vacuum
Some features of a new method of fastening two-layer diamond-hard alloy plates (DHI) and biplates of cyborite (BPC) to steel and tungsten-cobalt substrates by pressure welding in vacuum are considered. New results of studies on the influence of the main process parameters (pressure, temperature, isothermal holding time, degree of vacuum) on the strength and quality of the welded joint at temperatures up to 700 °C, as well as the results of testing cutting tools in production conditions are presented.