Method for producing an object at least partly with a silicon carbide structure from a blank of a carbon-containing material

Abstract

The invention relates to a method for production of an object with an at least partly silicon carbide structure from a blank of a carbon-containing material, wherein, in a first step, the object made from the carbon-containing material is produced essentially in the desired end form and/or end size, the object made from the carbon-containing material is then at least partly enveloped in a carbon-rich silicon dioxide granulate and then fired at least once in the envelope in a protective gas atmosphere such that the silicon dioxide granulate gives off gas containing silicon carbide which diffuses into the object and the carbon-containing material is completely or partly converted into silicon carbide. The invention further relates to a method for producing an object with an at least partly silicon carbide structure from a blank made from a carbon-containing material or a porous silicon carbide in which the pre-made object is infiltrated with a precursor sol containing silicon and carbon and fired at least once in a protective gas atmosphere at a firing temperature for carrying out a carbothermal reduction, wherein the infiltrated precursor sol gives off a gas containing silicon carbide which converts the material of the object partly or completely into silicon carbide.