"Preparation of Mechanically Activated Mixtures of Titanium With the Carbon Nanotubes and Study of Their Properties Under Thermal Explosion"

Abstract

The aim of the work was to study the effect of preliminary mechanical activation of titanium powder mixtures with the carbon nanotubes on a possibility of realization of the self-propagating interaction of reagents in the mode of dynamic thermal explosion and influence on phase composition and morphology of the formed products. It was found that after 2 min. mechanical activation, mechanocomposites of various sizes of irregular shape are formed, some of which are lamellar. There are no carbon nanotubes on the surface of titanium particles, which indicates their incorporation into the volume of mechanocomposites. The thermal explosion in activated samples of composition Ti+4% carbon nanotubes is realized starting from 1.5 min of mechanoactivation. The nature of the thermal explosion varies with the increase in the time of preliminary mechanical activation. After 3 min. of mechanoactivation in the sample at 346°C, the preliminary smooth heat release starts at a temperature of 441°C, and a thermal explosion occurs, the maximum temperature is 930°C. The phase composition of the products of the thermal explosion of the system under investigation is practically independent of the time of the preliminary mechanical activation. When the mechanical activation time is increased from 1.5 to 7 min., the products of the thermal explosion are titanium and titanium carbide.