CONTENTS

Production, Structure, Properties

Kushch V. І., Podoba О. P., Shmegera S. V., Bochecka О. О. Effect of isotopic content, crystal size, intergranular thermal resistance, and temperature on thermal conductivity of diamond nanopolycrystals and nanocomposites. . . . .

3

Matar S. F. Body center tetragonal pseudo-diamond C₂₀: crystal chemistry and first principles investigations of physical properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17

Dutka V. A., Maystrenko A. L., Kolodnitskyi V. M. Computer investigation of the effect of high-speed pressure sintering parameters on densification and grain growth of boron carbide based materials. . . . . . . . . . . . . . . . . . . . . . . .

26

Klymenko S. A., Manokhin A. S., Klymenko S. An., Melniychuk Yu. O., Belorusets V. V., Starik S. P., Chumak A. O., Kopeіkina M. Yu., Riabchenko S. V. Determination of residual stresses in protective coatings on the substrate made of PCBN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40

Xiaoli Zhang, Li Wei, Yanbin Wang, Jiahui Liu, Zhuo Wang, Tengfei Ye, Jiaqi Zheng, Yikang Zhang, Zhangjing Chen, Zongheng Jiang. The effect of preparing condition and Al increase on the bending strength and wearing property of Mo(Si,Al)₂–cBN superhard composite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

Investigation of Machining Processes

Filatov Yu. D., Prikhna T. O., Boyarintsev A. Y., Sidorko V. I., Kovalev S. V., Rybalka I. A. Polishing of optical components made of glass, semiconductors and copper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

63

Sokhan’ S. V., Voznyy V. V., Sorochenko V. H. Diamond grinding of ceramic balls in an annular groove and circular feed with oscillation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

76

Tools, Powders, Pastes

Lavrinenko V. I., Smokvyna V. V., Ilnytska H. D., Oliinyk N. O., Bazaliy G. A., Solod V. Yu. Performance indicators of the grinder tools with diamond grinding powder after flotation separation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

92

Letters to the Editor

Solozhenko V. L. Melting of boron-rich chalcogenides B₁₂S and B₁₂Se under pressure. . . . . . . . . . . . . . . . . . . . . . 

100

Prikhna T. O., Ünsal H., Barvitskyi P. P., Moshchil V. E. Mechanical properties study and ablation tests of hot pressed ultrahightemperature HfB₂ and HfB₂–SiC ceramics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

103