Finely dispersed silicon carbide synthesis model in the electrothermal reactor with periodic batch loading

Abstract

Abstract Fine silicon carbide is used in metallurgy, electronic devices and the aviation industry. Reactors where the synthesis of finely dispersed carbides is organized in an electrothermal fluidized bed (ETKS reactors) have several advantages over resistance furnaces used for mass production of carbides. The basic advantage is the direct production of a finely dispersed fraction of carbide-containing particles with lower specific costs of electric energy. In this article, there were studied non-stationary processes in an ETKS reactor operating in the mode of periodic loading into the reaction volume of components of chemical reactions for the synthesis of silicon carbide: finely dispersed carbon-containing particles and SiO2 particles (batch). A mathematical model of synthesis for non-stationary conditions is developed. Relations are obtained for calculating changes in the process of silicon carbide synthesis not only of the sizes of solid (liquid) particles participating in chemical reactions, but also of the concentrations of volatile components that affect the rates of these reactions in the working volume of the ETKS reactor. There were carried out calculations to identify the influence of determining factors on the yield of the final product and the analysis of these results. A comparison of the calculation results with the available experimental data on the yield of silicon carbide in an ETKS reactor with a periodic charge loading was presented.