Patent ID: 7867313

Claim:
A process for the production of a porous β-SiC-bearing ceramic molded body having a three-dimensional continuous β-SiC-structure, which has substantially no grain boundaries, the process including the steps of: (a) extruding a molded body from a material which includes silicon-bearing particles, carbon-bearing particles, aluminum-bearing particles and a cokable organic binding agent, (b) pyrolyzing the porous molded body produced in step (a) at a temperature of between 600 and 1000° C., (c) silicating the porous molded body by heating to a temperature in a range of between 1100 and 1500° C. to obtain the porous β-SiC-bearing molded body which has an aluminum layer at the surface of the open pores and passages, and (d) oxidizing the aluminum layer from step (c) to produce an aluminum oxide layer.