Process for producing refractory molded bodies based on silicon carbide with silicon nitride/oxinitride bonding, their use, and molding compound as intermediate product

摘要

Refractory silicon carbide molded bodies with silicon nitride and/or silicon oxinitride bonding are produced by adding bentonite to a mixture of silicon carbide and silicon, dry pressing and firing in a nitrogen atmosphere. The molded bodies are highly stable at ambient temperature up to about 1600 DEG C and, with a sufficient proportion of oxinitride, are very resistant to oxidation. Preferably, a part of the silicon carbide is used in powder form with a particle size of < 5 mu . The corresponding molding compounds are characterized by very good processing qualities. The refractory molded bodies obtained using the process as per the invention are suitable for kiln furniture, furnace linings or, in porous form, hot gas filters.