UDC 669.018.25
L. I. Aleksandrova, V. P. Bondarenko, T. V. Nayuk, N. A. Yurchuk (Kyiv)
The effect of thermal cycling treatment of tungsten carbide hard alloys on their structure and properties. Part 2
The possibility of increasing the plastic characteristics (while maintaining strength) of finally sintered high-cobalt hard alloys of the VK15 and VK20 grades using thermal cycling treatment is shown. It is established that an increase in the level of plastic characteristics of these alloys is ensured by changing their structural state.
UDC 666.233. – 621.385
V. Yu. Dolmatov (St. Petersburg)
Modern industrial technology for producing detonation nanodiamonds and the main areas of their use. Message 2
The main advantages of using detonation nanodiamonds in electroplating, polishing, oils and lubricants are demonstrated.
UDC 539.266; 538.214
V. M. Perevertaylo, O. B. Loginova, A. S. Roik, V. P. Kazimirov
Structure, surface properties of Sn-Ge melts and their role in the crystallization of germanium from the melt
The relationship between the nature of atomic ordering in the Sn-Ge melt, its bulk and surface properties and the process of germanium crystallization from the melt is discussed. It is shown that, along with the magnitude of the interfacial energy and supersaturation, the formation of microgroups of the crystallizing substance with distances inherent in the bond length of this substance in the solid state contributes to an increase in the rate of its growth from the melt.
UDC 539.266
S. O. Lisovenko (m. Kiev)
Analysis of the RMC model for melting the Ni-C system
To explain the order of mutual exchange of atoms in the Ni-C melt and the nature of the interaction between carbon and nickel, an analysis of the system was carried out using an additional model, determined by the RMC method based on the structure factor. It has been shown that, due to the stability of graphite in isolated carbon atoms, which are found in sharpened nickel atoms, sp³-hybridization can be stabilized, so that isolated carbon atoms swell in the melt Electronic nickel is like diamond.
UDC 621.762.5
N. P. Bezhenar, S. A. Bozhko, L. A. Romanko, N. N. Belyavina (Kyiv)
Hardness and electrical resistance of composites of the cBN—Al—TiC(TiN) system obtained by reaction sintering at high pressure
The results of statistical processing of data from a multifactorial experiment are presented, in which the influence of the composition of the charge and the dispersion of its components on the hardness and electrical conductivity of cubic boron nitride composites — refractory compounds obtained by sintering at high pressure were studied.
UDC 004.85
I. A. Kossko, A. A. Kryuchin, F. I. Korzhinsky, L. D. Sereda, I. V. Sereda (Kyiv)
Si—SiO2- and Si—SiO2—SiC-stamps
The possibility of forming an information relief in silicon oxide grown on massive single-crystal silicon is considered. The method of electron lithography and chemical etching is used to obtain the microrelief. To further increase the hardness, wear resistance and chemical resistance of the stamp, a method of applying a thin film of silicon carbide to the silicon surface is proposed. The use of the resulting stamp for direct mastering of optical storage media and for long-term data storage is discussed.
UDC 621.923
N. V. Azarova, P. G. Matyukha (Donetsk)
Calculation of parameters of roughness of ground surface taking into account radial oscillations of the working surface of the wheel
A method of analytical calculation of parameters of roughness of the processed surface during diamond grinding is proposed taking into account the influence of radial oscillations of the working surface of the grinding wheel, covering the whole range of parameters provided by GOST 25142-82 and DSTU ISO 12085-2001 for assessment of roughness of the ground surface.
UDC 621.921
V. I. Lavrinenko, I. V. Leshchuk, V. O. Skryabin (m. Kiev)
Approach to the selection of technological resources as a non-traditional method of implicit polarization during diamond grinding
The development of a new approach to the selection of technological resources as a non-traditional method of implicit polarization during grinding is considered. It is shown the ways in which diamond grinding can be achieved through the use of highly activated water and the effect of electrochemical heterogeneity of the bond surface due to the hardening factor of the forward water-polishing with a working wheel ball.
UDC 541.128.13:541.183.26
G. P. Bogatyreva, M. A. Marinich, G. A. Bazaliy, V. L. Gvyazdovskaya, E. V. Ishchenko, V. M. Maevsky, T. M. Nesterenko (Kiev)
Adsorption properties of submicron cubic boron nitride powders
The surface state of submicron cubic boron nitride powders was qualitatively assessed using thermal desorption spectra. It was found that water vapor, atomic and molecular oxygen, molecular nitrogen, ammonia, nitrogen, boron, magnesium oxides, and hydrogen borohydrate are adsorbed on their surface, which are both physically and chemically bound. It was shown that the amount of molecular oxygen physically adsorbed on the surface is significantly greater than that of atomic oxygen, and the amount of chemically adsorbed atomic oxygen is greater than molecular oxygen.
The process of electrochemical adsorption of hydrogen and iron ions on the surface of cubonite powders from solutions of the same ions is described. The defect structure of CBN submicropowders and its role in the adsorption processes occurring on their surface are studied using the electron paramagnetic resonance method. It is shown that a decrease in the size of CBN grains is accompanied by a change in the structure of the observed paramagnetic centers, which are of a surface nature and can participate in the formation of adsorption centers.
DK 546.27:542.913
V. L. Solozhenko, A. A. Kurakevich (Paris), K. Lathe (Hamburg)
On the issue of synthesis of graphite-like B2O.