RESEARCH INFLUENCE OF THERMAL PLASMA ENERGY ON MORPHOLOGY AND PHASE COMPOSITION ALUMINUM SILICATE MICROSPHERES

Abstract

The effect of thermal plasma energy on the morphology and phase composition of agglomerated refractory oxide powders has been studied. It has been established that during the processing of an agglomerated powder based on the ash residue of a state district power station in a thermal plasma flow with different thermophysical characteristics of the carrier medium, three types of morphological features of the particles are formed: a dense particle with separate gas inclusions in the surface layer; hollow spherical particle; vitrified agglomerated particle with solid-phase inclusions. Agglomerated polycrystalline powders after processing according to XRD data are amorphous. The X-ray diffraction patterns of particles processed in the turbulent regime of plasma jet outflow show a small Bragg peak of ?-quartz. This means that the grains do not reach the molten state in the center of the agglomerate.