CONTENTS

Production, Structure, Properties

Prikhna T. O., Lokatkina A. S., Barvitskyi P. P., Karpets M. V., Ponomaryov S. S., Bondar А. А., Büchner B., Werner J., Kluge R., Moshchil V. E., Borymskyi O. I., Devin L. M., Rychev S. V., Haber R., Yasar Zeynep Ayguzer, Matovic B., Rucki M., Prisyazhna О. V. Structure, mechanical characteristics and high temperature stability of ZrB₂- and HfB₂-based materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 

3

Bochechka O. O., Kushch O. V., Isonkin O. M., Petasyuk G. A., Chernienko O. I., Osipov O. S., Havrylova V. S., Borymskyi O. I., Rumiantseva Yu. Yu. Influence of the grain composition of diamond powders synthesized in the Mg–Zn–C system on the structure, physical, mechanical, and operational properties of polycrystals sintered from them at high pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .

21

Ratov B. T., Mechnik V. A., Bondarenko N. A., Kolodnitskyi V. M., Gevorkyan E. S., Nerubaskyi V. P., Gusmanova A. G., Fedorov B. V., Kaldibaev N. A., Arshidinova M. T., Kulych V. G. Features structure of the С_diamond‒(WC‒Co)‒ZrO₂ composite fracture surface as a result of impact loading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

36

Bugdayci Mehmet, Güleç Şeyma. Vacuum carbothermal synthesis of TiB₂. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 

51

Investigation of Machining Processes

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

62

Vovk O. O., Voloshin A. V., Slyunin E.V., Voloshina L. I., Kryvonogov S. I., Nizhankovskyi S. V. Material removal rate during titanium doped sapphire processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

74

Tools, Powders, Pastes

Klymenko S. A., Klymenko S. An., Kopіeіkina M. Yu., Manokhin А. S., Melniychuk Yu. O. Thermal phenomena on the front surface of the tool with PcBN during turning of hardened steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

86

Letters to the Editor

Solozhenko V. L. On crystal structure of superhard cubic BC₂N. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

100

Chasnyk V. I., Chasnyk D. V., Kaidash O. M. Effect of silicon carbide content on bulk electrical resistance of pressureless sintering AlN–SiC composites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

103