Jan-Eric Ståhl

Особливості формування структури та фазового складу в процесі реакційного спікання кубічного нітриду бору зі сполуками Ti, Cr, V

Features of the formation of the structure and phase composition in the process of reactive sintering of boron cubic nitride with Ti, Cr, V compounds

Summary, in English

Influence of sintering temperature on both phase composition and structure of ceramic matrix composites based on cubic boron nitride with binders in a form of Al and the Ti, Cr, V carbides are investigated by methods of physical materials science. As the object of study, three cBN–TiC–Al, cBN–Cr₃C₂–Al, cBN–VC–Al compositions containing 60% vol. cBN are selected. The composites are obtained by high-pressure high-temperature (HPHT) sintering in high-pressure apparatus AVTT-30 in the temperature range of 1600– 2450°C under pressure of 7.7 GPa. In the process of HPHT sintering of composites in the cBN–TiC–Al and cBN–Cr₃C₂–Al systems, the formation of titanium and chromium diborides is found at the temperatures of sintering Т_sint ≥ 1850°С and Т_sint ≥ 2150°С, respectively, simultaneously with the formation of alu-minium nitride.