UDC 621.921.34
V. Z. Turkevich, V. M. Kolodnitsky*
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv
*vturk@ism.kiev.ua
**stmj@ism.kiev.ua
On the achievements of the V. M. Bakul Institute of Superhard Materials in the field of synthesis and sintering of superhard materials during the period of its activity as part of the NAS of Ukraine (pp. 3–9)
The main achievements of the V. M. Bakul Institute of Superhard Materials, NAS of Ukraine in the field of synthesis and sintering of superhard materials at extremely high p, T-parameters during the period of its activity as part of the NAS of Ukraine are presented.
Keywords: synthesis, superhard materials, diamond, cubic boron nitride, high pressures and temperatures, single crystals, polycrystals, nano-crystals, tools.
UDC 621.921.34 : 666.233
AND. AND. Shulzhenko*, A.N.Sokolov, V. G. Gargin
Institute of Superhard Materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
*alexshulzhenko35@gmail.com
New diamond-based superhard materials: production, properties. Overview (pp. 10–24)
The processes underlying the production of diamond polycrystals are described, and the characteristics of the starting materials are given. The methods of obtaining diamond polycrystalline and composite materials are given, the factors affecting their composition and properties are analyzed. New approaches to obtaining diamond superhard materials of various functional uses are considered.
Key words: diamond, polycrystal, composite, high pressure, synthesis, sintering.
UDC 548.5:546.26-162:62-987
IN. IN. Lysakovsky, N. IN. Novikov, S. AND. Ivakhnenko, O. AND. Zanevsky, T. IN. Kovalenko*
Institute of Superhard Materials named after IN. N. Bakula National Academy of Sciences of Ukraine, Kyiv, Ukraine
*tetiana.v.kovalenko@gmail.com
Growth of structurally perfect diamond single crystals at high pressures and temperatures. Review (pp. 25–37)
Research performed at high pressures and temperatures (HTNR crystallization) made it possible to determine the regularities of phase transformations and carbon transfer in metallic solvents and to develop methods for growing large-scale structurally perfect diamond single crystals of types Ib, IIa and IIb. The obtained results served as the basis of the technology for the production of diamond products for use in electronics, laser technology, precision machining, and drilling tools. The use of the six-punch technique of high pressure and large volume made it possible to grow diamond single crystals with higher productivity. According to the assessment, the use of such high-pressure equipment gives the opportunity to release at least 1 million carat per hour of structurally perfect crystals of the required type for various applications.
Key words: diamond single crystals, high pressure device, growth systems, temperature gradient method.
UDC 621.921.34-492.2:620.22-419
AT. AT. Barrel
Institute of Superhard Materials named after IN. M. Bakulya National Academy of Sciences of Ukraine, m. Kyiv, Ukraine
bochechka@ism.kiev.ua
Obtaining polycrystalline materials by sintering nanodispersed diamond powders under high pressure (pp. 38–50)
The works devoted to the problems of forming polycrystalline materials with a high level of physical and mechanical properties by the method of sintering diamond nanopowders under high pressure conditions are considered. The mechanism of densification under the action of high pressure and high temperature of diamond nanopowders of different genesis is described, the features of the formation of the pore structure are considered and the determining role of the specified factor during sintering is shown. The need for degassing and modification of the surface of diamond nanoparticles during preparation for sintering is noted. The effectiveness of tungsten and its compounds as an activating additive for obtaining wear-resistant thermally stable diamond nanocomposites is shown.
Keywords: diamond nanopowders, high pressure, sintering, tungsten and its compounds nanopowders, diamond nanocomposites.
UDC 536.42:621.762:669.27
AND. F. Lysovsky*, I. AND. Hnatenko
Institute of Superhard Materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
*Gnatenko@ ism.kiev.ua
On the formation of intercarbide and interphase surfaces in WC–Co sintered hard alloys. Review (pp. 51–68)
Based on the analysis of published works, thermodynamic functions describing the processes of formation of intercarbide and interphase surfaces during solid- and liquid-phase sintering of WC–Co sintered hard alloys were obtained. Currently, certain progress has been made in the study of the structure and composition of intercarbide WC/WC and interphase WC/Co surfaces, and technologies have been developed that allow influencing the composition and structure of these surfaces. It is noted that the composition and structure of intercarbide and interphase surfaces of (Ti,W,Ta)C–WC–Co and (Ti,W,Nb)C–WC–Co hard alloys have not been sufficiently studied. Studies on the influence of the composition and structure of intercarbide and interphase surfaces on the physical and mechanical properties of sintered hard alloys and their operational characteristics remain relevant.
Keywords: sintered hard alloys, contact and interphase surfaces, thermodynamics, structure.
UDC 621.923
IN. AND. Lavrinenko V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
lavrinenko@ism.kiev.ua
Modern advances in the development of abrasive tools and the study of diamond abrasive machining processes (material science approach). Review (pp. 69–78)
A review of modern advances in the development of abrasive tools and the study of diamond abrasive machining processes is given. The need to take into account the interaction processes between the abrasive and the processed material and the influence of the processed material elements on the wear of abrasive grains is shown, as well as the importance of classifying diamonds by shape, especially in a wide range of their strength. The features of the application of CVD diamonds and methods of changing the diamond-bond boundary zone to improve grain retention are given.
Keywords: diamond abrasive machining, materials science, diamond, CVD diamond, wheel bond, interaction in the cutting zone.
UDC 621.91.02:621
N. AND. Bondarenko
Institute of Superhard Materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
bond@ism.kiev.ua
High-performance diamond tool ISM for drilling oil and gas wells. Review (pp. 79–92)
Works on the study of diamond tools for drilling oil and gas vertical and inclined directional wells are analyzed. A comparative assessment of the operational characteristics of diamond drilling tools of various functional purposes when drilling wells in soft and medium-hard rocks is given. A comparison of rock-crushing tools of different designs, equipped with new heat-resistant and wear-resistant composite diamond-containing materials, with similar tools of earlier versions was carried out. The main causes of premature tool wear when drilling medium and hard rocks at high speeds are discussed. Prospective directions in the field of creation and application of diamond drilling tools are defined.
Key words: rock-breaking tool, profile, drilling, well, composite diamond-containing material, wear resistance, penetration, mechanical speed.