CONTENTS

Production, Structure, Properties

Stratiichuk D. A., Belyavina N. M., Turkevich V. Z., Starik S. P., Romanenko Ya. M. Influence of Ni, Co, and W on the reaction sintering of cBN composites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

3

Serbeniuk T. B., Prikhna T. O., Sverdun V. B., Moshchil V. E., Karpets M. V., Marchenko A. A., Bilorusets V. V., Starik S. P. The research on the structure and mechanical properties of the composite ceramic materials AlN–С–TiB₂. . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

Matviichuk O. O., Prysyazhnyuk P. M., Kotsyubynsky V., Tataryn V. V., Ropyak L. Ya., Savchuk I. V., Turkevych V. Z. First-principles study of the mechanical properties of (Ti,W)C solid solutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

24

Sun Chang Hong, Ding Zi Yang, Lyu Cui, Liang Bao Yan. Construction of a synergistic etching system based on Fe₂O₃–Si highly exothermic reaction and its mechanism in diamond surface etching. . . . . . . . . . . . . . . . . . . . . . . . . . .

41

Vyshnevskyi O. A., Kvasnytsya V. M., Wirth R., Pavliuk O. V., Schreiber A. Inclusions of manganese and manganese-nickel compounds in microdiamonds from various rocks on the Ukrainian shield. . . . . . . . . . . . . . . . . . . . 

54

Investigation of Machining Processes

Filatov Yu. D. Influence of the geometric shape of the surfaces of copper optical parts on the formation of their surface layer during polishing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

Tools, Powders, Pastes

Petasyuk G. А., Bochechka О. О., Lavrinenko V. І., Poltoratskii V. G., Smokvyna V. V., Bilorusets V. V., Prots L. A. Performance indicators of a grind tool using diamond abrasive powders with cBN coating on the surface of their grains in the cutting layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

78

Letters to the Editor

Solozhenko V. L. Melting of B₁₂As₂ boron subarsenide under pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

89

Matar S. F. Trigonal (sp²) and tetrahedral (sp³) original C₁₂ orthorhombic allotropes with super-hard behaviors; crystal engineering and DFT studies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

92

Jubiles, Dates

To the 80th anniversary of Corresponding Member of the NAS of Ukraine Anatolii Lvovych Maystrenko. . . . . . . . . . . . . 

97