The mechanism of silicon nitride growth upon ferrosilicon burning in nitrogen

The process of nitride formation during the combustion of an iron-silicon alloy in gaseous nitrogen has been investigated. It was found that the synthesis of silicon nitride occurs at temperatures (2100 ° C), significantly higher than the temperature of the appearance of the liquid phase (1206 ° C). In the process of synthesis, silicon is in a liquid state in the form of an iron-silicon melt and in a gaseous state. Electron microscopic studies have shown that the growth of silicon nitride crystals is carried out by two mechanisms: vapor - liquid - crystal and crystallization from iron-silicon melt. The ratio of the contributions of these mechanisms to the structure formation process of silicon nitride is determined by the synthesis conditions. Il. 4, bibliography: 8 titles.