CONTENTS

Production, Structure, Properties

Kaidash O. N., Turkevich V. Z., Ivzhenko V. V., Itsenko P. P., Tkach V. N. The influence of in situ formed TiB₂–VB₂ borides on the structure and properties of hot-pressed B₄C–(TiH₂–VC) ceramic system. . . . . . . . . . . . . . . . . . . . . . . . .

3

Al-Khatatbeh Yahya, Tarawneh Khaldoun, Al-Taani Hussein, Lee Kanani K. M. Theoretical and experimental evidence for a post-cotunnite phase transition in hafnia at high pressures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

Kaplun P. V., Soroka E. B., Snozik A. V. The impact of hydrogen-free ion nitriding on physicomechanical and performance characteristics of hard alloys T5K10 and T15K6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26

Wang Liangbiao, Shen Qianli, Qin Hengfei, Zhao Dejian, Liu Weiqiao, Sun Jianhua, Zhu Binglong, Zhou Quanfa. Chemical synthesis of niobium diboride nanosheets by a solid-state reaction route. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36

Investigation of Machining Processes

Ociepa Michal, Jenek Mariusz, Feldshtein Eugene. On the wear comparative analysis of cutting tools made of composite materials based on polycrystalline cubic boron nitride when finish turning of AISI D2 (EN X153CrMoV12) steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41

Sokhan’ S. V., Maistrenko A. L., Sorochenko V. G., Voznyi V. V., Kulych V. G., Gamanyuk M. P., Zubanev E. M. The influence of machining conditions on performance of diamond grinding of silicon carbide ceramic balls. . . .

50

Tools, Powders, Pastes

Petasyuk G. A., Lavrinenko V. I., Sirota Yu. V., Muzichka D. G. A study of the tendency and extent of variation of morphometric characteristics of standard synthetic diamond grits in a continuous series of their grades and sizes. .

65

Manokhin A. S., Klimenko S. A., Klimenko S. An., Beresnev V. M. Promising types of coatings for PCBN tools. .

78

Letters to the Editor

Fesenko I. P., Viduta L. B., Chasnyk V. I., Nechytailo V. B., Butenko D. V., Tkach V. M., Turkevich V. Z., Marchenko O. A., Zelenska I. I., Kaidash O. M., Serbenyuk T. B., Belyaeva T. M., Kuz’menko E. F., Tomchuk P. M. Structure and current-voltage characteristics of islet gold films on high-heat conducting pressureless sintered AlN ceramics. . . . .

89

Shul’zhenko A. A., Jaworska L., Sokolov A. N., Romanko L. A., Gargin V. G., Belyavina N. N., Tkach V. N., Zakora A. P. Structure and electrophysical properties of the diamond–graphen–silicon carbide composite. . . . .

92