CONTENTS

Production, Structure, Properties

Matar S. F. Super-hard novel C₈ allotrope and derived subnitride C₆N₂ with cyclopropane-like C3 building units. Crystal chemistry and first principles investigations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Ratov B. Т., Mechnik V. A., Bondarenko N. A., Hevorkian E. S., Kolodnitskyi V. M., Prikhna T. A., Moshchil V. E., Kalzhanova А. B., Sundetova P. S., Utepov Z. G. Physical and mechanical properties of the material matrix of C_diamond–(Fe–Cr–Cu–Ni–Sn) composite materials obtained by spark-plasma sintering. . . . . . . . . . . . . . . . . . . . . . .

11

Prokopiv M. M., Kharchenko O. V., Uschapovskyi Yu. P., Lisovska I. V., Zakiev I. M. Hard alloy WS‒(Ti,W)C–10Со with increased hardness and strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

25

Akimov G. Ya., Sheremet V. I., Andreiev I. V., Studenets S. F., Sheykin S. Ye., Trosnikova I. Yu., Loboda P. I. Effect of high hydrostatic pressure treatment of WC–15Co cemented carbide on its wear resistance. . . . . . . . . . . . . . 

37

Chasnyk V. I., Chasnyk D. V., Kaidash O. M. Investigation of surface and bulk electrical resistance of pressureless sintered AlN–50 % wt SiC composites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

48

Investigation of Machining Processes

Lavrinenko V. I., Smokvyna V. V., Ilnytska H. D., Starik S. P., Tyshchenko V. A. Confirmation of the presence of adsorbed water on the surface of modern diamond grains of low strength as a factor of possible further influence on the contact zone during grinding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

56

Sokhan’ S. V., Voznyy V. V., Sorochenko V. H. Diamond grinding of ceramic balls based on the plane with circular feed and oscillation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

Tools, Powders, Pastes

Guo Yaofeng, Zhang Gaoliang, Ye Tengfei, Qian Guanwen, Li Yizhen, Xia Hengwen, Zuo Donghua, Wu Wushan, Zhao Yanjun. Evaluation of powder mixing uniformity in abrasives industry. . . . . . . . . . . . . . . . . . . . . . . . . . .

82

Letters to the Editor

Klymenko S. A., Bondarenko M. O., Ivakhnenko S. O., Lysakovskyi V. V., Kopieikina M. Yu., Kovalenko T. V., Zanevskyy O. O. Surface roughness and lateral forces on the fronts of diamond monocrests of type Ib and IIa. . . . .

99