UDC 620.22-419:621.921.34:622.23.051.7
IN. N. Kolodnytskyi1, *, O. E. Bagirov2, **1Institute of superhard materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
2SOCAR-AQS LLC, Baku, Azerbaijan
*stmj@ism.kiev.ua
**obagirov@socar-aqs.com
On the formation of the structure of composite diamond-containing materials used in drilling and stone-working tools (Overview) (pp. 3–26)
The analysis of the works devoted to the study of the structure and properties of composite diamond-containing materials diamond–WC–Co, diamond-(Fe–Cu–Ni–Sn), diamond-(Co–Cu–Sn) and diamond-hard alloy plates used for the manufacture of tools for drilling oil and gas wells, as well as the stone processing industry, was performed. Particular attention is paid to the formation of the structure of the diamond-matrix transition zone, mechanical and operational properties of composites. Prospective directions for the development of materials science of composite diamond-containing materials used in rock-crushing tools are identified.
Key words: diamond, tungsten carbide, cobalt, iron, nickel, copper, tin, diamond-hard alloy plate, composite, temperature, properties, rock-breaking tool.
UDC 548.736.15:621.794.4
L.M. Yang, J.H. Gong, Z.M. Yue, S.N. Liu, Q.L. Chen, J. Gao*
School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai, China
*gongjh@sdu.edu.cn
**shdgj@sdu.edu.cn
Preferential etching by flowing oxygen on the {100} surfaces of HPHT single-crystal diamond (p. 27–34)
Application of diamond is determined by its oxidation behavior to some extent. Oxidation process of single-crystal diamond prepared under high pressure and high temperature has been studied by the thermal analysis, scanning electron microscope and Raman spectrometer.The result of a simultaneous thermal analysis indicates that single-crystal diamond is oxidized at ~ 818 °C at a heating rate of 5 °C/min in the flowing oxygen. Based on the data of the thermal analysis at different heating rates, the activation energy is calculated by the Kissinger method. A weight loss rate increases with the rising heat treatment temperature from 600 to 800 °C. After the oxidation at 800°C, etch pits emerge on the {100} surfaces of single-crystal diamond, while the {111} surfaces are smooth. Shapes of the etch pits on the {100} surfaces are inverted pyramidal hollows, with edges direction parallel to the <110> direction.
Keywords: single-crystal diamond, preferential etching, oxidation, thermal stability.
UDC 548
AND. IN. Lysenko
Institute of Superhard Materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
gart.ua@i.ua
The energy of interatomic bonds and the analytical scale of hardness (pp. 35–46)
On the basis of detailed models of interatomic cohesion, as well as a developed structural-thermodynamic approach, the energy of interatomic bonds in a number of covalent and metallic crystals, corresponding to experimental data, was determined. Using the presented analytical dependence for the degree of covalency of crystals, a generalized model was developed that describes the experimental hardness of superscleromers (diamond, sВN, SiС, etc.), minerals, refractory compounds, semiconductors, ionic crystals, and metals. Based on the mechano-chemical approach to (nano)flow, a dislocation model of the crystal-mechanical anisotropy of the yield point in single-crystal diamond and lonsdaleite was developed, which allows us to draw a conclusion about the slight difference in their sclerometric characteristics. Experimental relations determining thermo- and baroplasticity in some covalent crystals are considered.
Key words: physical and chemical mechanics of solid crystalline bodies, scleroscience, structural thermodynamics of crystals, carbon science, 3d lattice high molecular compounds.
UDC 666.3/7: 541.138.2: 620.198.27
IN. P. Konoval*, A. P. Umansky, V. N. Talash, V. AND. Lavrenko, Yu. B. Rudenko, V. I. Saturday
Institute of Materials Science Problems named after I. N. Frantsevich National Academy of Sciences of Ukraine, Kyiv, Ukraine
*akwa@ukr.net
Electrochemical corrosion of composite materials of the TiCrB2–AlN system in a 3% NaCl solution (pp. 47–55)
Using the method of potentiodynamic polarization curves, the corrosion resistance of ceramic materials and cermets based on titanium-chromium diboride in a 3% NaCl solution simulating seawater was studied. The composition and microstructure of the surfaces of oxidized samples were studied. Small additions of AlN (5–10% (by volume)) in TiCrB2 significantly increase the corrosion resistance of the material. The introduction of a metal bond from the NiAlCr alloy into the composition of the material reduces the resistance of the material to anodic oxidation.
Keywords: electrochemical corrosion, titanium-chromium diboride, aluminum nitride, composite material.
UDC 621.941:534.647
L. N. Devin, S. IN. Rychev*
Institute of Superhard Materials named after IN. N. Bakulya National Academy of Sciences of Ukraine, Kyiv, Ukraine
*ldevin@ism.kiev.ua
**richev.sergey@gmail.com
Correlation model of acoustic emission during fine diamond turning (Artp. 56–65)
The process of cutting aluminum alloy was diagnosed using the acoustic emission method. Cutters made of single crystals of natural and synthetic diamond were used in the study. Comparative analysis showed the validity of Pen and Dornfeld’s acoustic emission correlation model for the conditions of fine diamond turning of aluminum alloys.
Keywords: acoustic emission, model of acoustic emission, diamond turning.
UDC 621.921.34-419:621.9.01:669.295
L. Jaworska1, W. Zebala2, P. Rutkowski3, S. Cygan1, *, P. Klimczyk1, P. Putyra1
1Centre for Materials Research and Sintering Technology, Institute for Advanced Manufacturing Technology, Krakow, Poland
2Faculty of Mechanical Engineering, Krakow University of Technology, Krakow, Poland
3Department of Ceramics and Refractories, University of Science and Technology, Krakow, Poland
*slawomir.cygan@ios.krakow.pl
Temperatures during the dry cutting of titanium alloy using diamond composites with ceramic bonding phases
In this paper the thermal properties of diamond composites with ceramic bonding phases, such as the Ti–Si–C system with nanometric Ti(CN) and TiB2 are presented. The thermal conductivities of the materials were analyzed by the laser pulse method. In addition, computational simulations of the temperature dependence on the distance from the cutting edge were performed according to the finite element method for the investigated composites, commercial PCD, and hypothetical diamond monocrystal. Two cutting speeds were considered during the numerical computations: 100 and 200 m/min. To verify the simulations, the TNGA 160408 cutting insert, which was prepared from the investigated diamond composites and commercial material, was employed. Dry turning tests of titanium alloy were conducted. The temperatures during the machining processes were observed using a thermovision camera, and the surface roughness was measured after the tests. The computational simulations confirmed the strong dependence between the thermal properties of the cutting material and the temperatures within the cutting zone. The temperature measurements during the dry cutting tests reveal significantly higher temperatures than the temperature measurements achieved during the simulations.
Keywords: diamond-ceramic composite, thermal properties, cutting tools, turning.
UDC 621.922.34
M. N. Sheiko
Institute of Superhard Materials named after V. N. Bakulya, National Academy of Sciences of Ukraine, Kyiv, Ukraine
max-kiev@i.ua
To the question of the theoretical justification of the choice of the effective shape of the grain profile when modeling the diamond layer of the straightening tool. Message 2. Electroplating (pp. 77–88)
The statistical mechanism of the formation of the round shape of the averaged cross-section of scratches produced by the flat faces of diamond grains in the abrasive material of grinding wheels when straightening them with diamond rollers made by the electroplating method is theoretically disclosed. The distribution of the parameters of the orientation of the cutting edges of diamond grains is established and a brief comparative analysis of the characteristics of the straightening tools made by the methods of electroplating and electroplating is given. The concept of the approximate effective diameter is introduced into the model representation of the diamond cutting grain, and its connection with the grain size of the diamond powder in the tool is established, which is necessary for the calculation of single and total cross-sections of sections, straightening forces and surface roughness of products polished with pre-filled abrasive wheels.
Key words: straightening tool, electroplating technology, electroplating method, diamond grain, scratch cross-section, statistical mechanism, distribution of cutting edge orientation parameters.
UDC 621.921.34-492.2:536.421.5:661.657.5
H. S. Oleynyk1, *, A. A. Bochechka2, V. I. Lyashenko1, A. V. Kotko1, S. N. Nazarchuk2
1Institute of Problems of Materials Science named after I.N. Frantsevich National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Institute of superhard materials named after V. N. Bakulya, National Academy of Sciences of Ukraine, Kyiv, Ukraine
*oleynik@ipms.kiev.ua
On the interaction of ultradispersed detonation synthesis diamond and turbostrate boron nitride (pp. 89–93)
The results of the electron-microscopic study of initial powders of ultradispersed diamonds with tBN coating, as well as after sintering of such powders in the initial state and with coating, are presented. The possibility of interaction of the initial components during the sintering process with the formation of diamond-like phases has been established.
Key words: ultradisperse diamond, turbostrate boron nitride, high-pressure sintering, coating, transmission electron microscopy, formation of diamond-like phases.
UDC 661.657/.636:539.58
V. L. Solozhenko1, *, K. A. Cherednichenko1, O. O. Kurakevych2
1LSPM–CNRS, Université Paris Nord, Villetaneuse, France
2IMPMC, UPMC Sorbonne Universités, Paris, France
*vladimir.solozhenko@univ-paris13.fr
Thermoelastic equation of state of boron subphosphide B12P2 (p. 94–98)
Compressibility of boron subphosphide B12P2 has been studied under quasi-hydrostatic conditions up to 26 GPa and 2600 K using laser-heated diamond anvil cell and angle-dispersive synchrotron X-ray diffraction. 300-K data fit yields the values of bulk modulus B0 = 192(11) GPa and its first pressure derivative B0’= 5.5(12). It has been found that at ambient pressure the thermal expansion is quasi-linear up to 1300 K with average volume expansion coefficient α = 17.4(1)×10–6 K–1.The whole set of experimental p–V–T data is well described by the Anderson-Grüneisen model with δT = 6.
Keywords: boron subphosphide, high pressure, equation of state, thermal expansion.