The Effect of Reducing and Oxidizing Gases and Molten Slag and Alkalis on the Properties and Resistance of Nitride-Based Refractory Materials

Silicon carbide refractory materials and specimens of silicon nitride and silicon oxynitride are tested under high-temperature attack from reducing (H₂ and CO) and oxidizing gases (O₂, air) and from molten slag, alkalis, and iron. It is shown that nitride-based refractory materials are prone to change their properties, structure, and resistance when exposed to molten slag, iron, and alkalis. Silicon oxynitride and silicon nitride resist attack from carbon monoxide and alkali and provide protection to silicon carbide used as the refractory lining for blast furnaces.