CONTENTS

Production, Structure, Properties

Matar S. F., Solozhenko V. L. Novel ultrahard carbon allotropes from crystal chemistry and first principles: rhombohedral ene-C₂₁ and yne-C₂₄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Rumiantseva Yu. Yu., Lysovenko S. O., Turkevych V. Z., Klimchyk P. P., Bilyavi-na N. M., Bushlya V. M., Savchenko D. O., Klymenko S. An., Turkevych D. V. The features of the reactive interaction of boron nitride with tantalum nitride in the presence of microfibers and liquid aluminum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13

Wirth R., Kvasnytsya V. M., Schreiber А. Octahedral overgrowth structures on impact diamond. . . . . . . . . . . . . . .

17

Serbeniuk T. B., Prikhna T. O., Sverdun V. B., Oliynyk V. V., Grygoruk V. I.,  Zagorodnii V. V., Karpets M. V., Ponomaryov S. S., Marchenko A. A., Polikarpova L. O. The effect of changing the concentration of the graphite com­ponent in the structure of AlN-based composite materials on their electrodynamic properties. . . . . . . . . . . . . . . .

26

Duan Mantang, Solodkyi I. V., Bogomol Y. I. Recent research progress on the preparation of high-entropy boride ceramics (Review). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37

Hnatenko I. O., Andreiev I. V., Lysovenko S. O., Roik O. S., Osipov O. S., Kosenchuk T. O. The influence of the temperature of barothermal processing of sintered cemented carbides on the evolution of their structure and properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

Investigation of Machining Processes

Filatov Yu. D., Sidorko V. I., Kovalev S. V., Boyarintsev A. Y., Kovalev V. A., Yurchyshyn O. Y. Scattering of wear nanoparticles of polishing powder on sludge nanoparticles during polishing of polymer optics materials. . . . . . . . . .

58

Lavrinenko V. I. The phenomenon of lagging in operational values indicators of grinding wheels, called shape change of the cutting surface of the wheel in the radial direction during diamond abrasive processing. . . . . . . . . . . .

69

Tools, Powders, Pastes

Koroviaka Ye. A., Ihnatov A. O., Pavlychenko A. V., Valouch Karel, Rastsvieta-iev V. O., Matyash O. V., Mekshun M. R., Shypunov S. O. A study of the functional features of the rock-destroying and technological tool. . . . . . . . . . . . . .

77

Letters to the Editor

Prokopiv M. M., Kharchenko O. V., Zap I. V., Gnylycya I. D. Cermet Cr₂O₃–22Cr for instrumental purposes, obtained by the method of electric sintering at a pressure of up to 800 MPa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

92

Jubiles, Dates

To the 85th anniversary of Professor Volodymyr Terentiyovych HOLOVCHAN . .

97

Index of papers published in the Nadtverdi Materialy Journal in 2023. . . . . . . . . . . . . . . . . . . . . . . . .

98