METHOD FOR THE PRODUCTION OF MOLDED BODIES FROM REACTION-BONDED, SILICON-INFILTRATED SILICON CARBIDE AND/OR BORON CARBIDE AND THUS PRODUCED MOLDED BODY

摘要

The invention relates to a method for the production of molded bodies from reaction-bonded, silicon-infiltrated silicon carbide and/or boron carbide, wherein a preform body is monolithically constructed in layers from an amorphous granulation using a physical or chemical curing or melting process, wherein the granulation comprises a proportion of at least 95 % of silicon carbide and/or boron carbide with an average grain size of 70 to 200 μm. The thus formed preform body is impregnated at least once with a soot suspension or carbon is introduced by gas phase deposition and, when brought into contact with liquid or gaseous silicon, it forms at a subsequent calcining secondary silicon carbide which solidifies a resulting infiltrated composite.