CONTENTS

Production, Structure, Properties

Bochechka О. О., Petasyuk G. А., Chernienko О. І., Venikov V. О., Havrylova V. S., Kurylyak T. O., Liamtseva А. О., Shevchuk S. M. The influence of grain size of diamond powders on the polycrystals formation of from them at high pressure and high temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Prokopiv M. M., Kharchenko O. V., Starik S. P., Zakharchuk H. P. Formation of a gradient structure TiСN–(Co, Ti, W)С,N on the surface of a specimenmade of the WC–5TiC–10Co hard alloy under vacuum in contact with TiN nanopowder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

Mo Peicheng, Cheng Jiarong, Pan Xiaoyi, Zhang Jun, Li Kai, Wang Peixun, Jiang Shiwei, Mo Luozhi, Chen Chao. Effect of holding time on the micro­structure and mechanical properties of B₄C-based composite materials. .

21

Matar S. F. Novel dense and super hard tetragonal and orthorhombic C₁₀: Crystal chemistry rationale and DFT investigations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32

Han Danhui, Wang Binhao, Peng Chong, Lyu Cui, Zhou Guangtong, Geng Chang­jian, Wang Xinying, Hu Bingtao. Controlled etching of diamond via carbothermal reduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41

Chasnyk V. I., Chasnyk D. V., Kaidash O. M. Influence of content and particle size distribution of molybdenum on the dielectric characteristics and electromag-netic energy absorption of AlN–Mo composites. . . . . . . . . . . . . . . . . . . . .

54

Investigation of Machining Processes

Filatov Yu. D., Boyarintsev A. Y., Sidorko V. I., Kovalev S. V., Kovalev V. A., Yurchyshyn O. Y. Scattering of sludge nanoparticles and polishing powder wear nanoparticles during polishing of optical components made of copper and aluminum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64

Tools, Powders, Pastes

Petasyuk G. A. Comparative analysis of the results of the external specific surface area of high-strength and Increased strength synthetic diamond grinding powders determining by extrapolation-analytical and fractional-averaging methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

78

Letters to the Editor

Stratiichuk D. A., Belyavina N. M., Turkevich V. Z., Starik S. P., Romanenko Ya. M. Оn the issue of liquid phase interaction between cBN and high-entropy alloys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

95