THERMODYNAMIC ANALYSIS OF CHEMICAL INTERACTION IN THE PRODUCTION OF PCBN COMPOSITES BY REACTIVE SINTERING WITH ALUMINUM UNDER HIGH PRESSURE

Abstract

A thermodynamic analysis of the chemical interaction of cubic boron nitride with refractory compounds of titanium and aluminum under high pressure has been performed. It has been shown that such interaction is possible in the temperature range up to 2300 K and pressures up to 7.7 GPa, with the isobaric-isothermal potential DG (Gibbs energy) being negative for this range of pressures and temperatures. When the temperature rises, the absolute value of DG increases; when the pressure rises, the absolute value of DG increases, i.e., increases in pressure and temperature promote chemical interaction in the systems under consideration.