SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS OF TITANIUM SILICIDE IN SILICON-TITANIUM HALIDE-SODIUM AZIDE SYSTEM

Abstract

The objective is to study the possibility of ob-taining titanium silicide using the azide technology of self-propagating high-temperature synthesis (SHS-Az) in silicon-titanium halide-sodium azide system. The task to which the paper is devoted is to find the optimal composition of the charge, which combus-tion gives the opportunity to obtain titanium halide by SHS-Az method. Research methods: the study of the titanium sil-icide synthesis in powder is carried out in the mode of solid-flame combustion in SHS-Az laboratory reactor. The synthesized powders are subjected to studies al-lowing to define the phase composition and structure. The studies are carried out using a diffractometer and a scanning electron microscope. The novelty of the work is in synthesizing tita-nium silicide not only by a new method in the mode of high-temperature combustion of the heterogeneous silicon-titanium halide-sodium azide system, but also by obtaining a powder with close values to the range of nanoparticles. Study results of obtaining titanium silicide by SHS-Az method from the heterogeneous silicon-titanium halide-sodium azide system show that the target product is a finely dispersed mixture of particles of equal shape but of different phase composition: Ti5Si3, TiSi2, TiN, Si, Ti. The average particle size is equal to 150-200 nm. Conclusions: it is found that Ti5Si3 and TiSi2 ti-tanium silicides can be obtained in the combustion mode by SHS-Az method from silicon-titanium halide-sodium azide system.