CONTENTS

Production, Structure, Properties

Matar S. F. Original orthorhombic tetrahedral-trigonal hybrid allotropes C_n (n = 8, 10, 12, 14) with ethene-like and propadiene-like units: Crystal engineering and quantum mechanical calculations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Serbeniuk T. B., Prikhna T. O., Zagorodnii V. V., Sverdun V. B., Oliynyk V. V., Karpets M. V., Moshchil V. E., Ponomaryov S. S. Electrodynamic properties of composites based on AlN–С and AlN–С–Mo obtained by pressureless sintering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

Dutka V. A., Maystrenko A. L., Kulych V. G., Borymskyi O. I. Simulation of densification of ceramic materials based on boron carbide during high-speed sintering under pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24

Hevorkian E. S., Nerubatskyi V. P., Chyshkala V. O., Lytovchenko S. V., Prokopiv M. M., Samociuk W., Mechnik V. A. Technological and innovative differences of the method of electroconsolidation as a type of method of plasma sintering of refractory compounds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . .

38

Wang Zhiming, Yan Xiecai, Tao Yakun, Sun Wucheng, Fang Xiaohong, Duan Longchen, Tan Songcheng. Effect of sintering parameters and liquid phase content on the properties of Fe-rich based impregnated diamond bit matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

52

Investigation of Machining Processes

Filatov Yu. D., Boyarintsev A. Y., Sidorko V. I., Kovalev S. V., Kolesnikov О. V., Novgorodtsev V. O., Polupan Ya. I. Mechanism of polishing scintillators based on polystyrene. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69

Tools, Powders, Pastes

Lavrinenko V. I. Boron oxide on the surface of grains from superhard materials as a possible factor in increasing he performance of grinding tools. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

84

Letters to the Editor

Prokopiv M. M., Kharchenko O. V., Fesenko I. P. Thermal conductivity of cutting tool ceramics, prepared from exothermal mixtures of Cr₂O₃–AlN and ZrO_2(M)–Al–C by hot pressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

93

Solozhenko V. L. Melting temperatures of (super)hard cubic boron pnictides. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

96