Patent ID: 6017473
Filing Date: 2000-01-25
Classification: B01D,C04B,F01N,Y02T,Y10S

Abstract:
A method for the production of a porous, permeable molded body made of silicon carbide, comprising the steps of:molding a green body by extruding a starting material which includes:an organic binding agent that can be coked, anda compound selected from the group of compounds consisting of:a) a starting powder of silicon,b) a mixture of silicon with portions of silicon carbide, said silicon carbide being present in an amount no greater than 25% by weight of the compound,c) a mixture of silicon with portions of carbon, andd) a mixture of silicon with portions of silicon carbide and carbon, wherein said silicon carbide is present in an amount no greater than 25% by weight of the compound,subjecting the green body to a coking treatment in an inert-gas atmosphere to produce a treated molded body; andheating the treated molded body in the presence of nitrogen or an inert gas containing nitrogen to such a temperature causing free silicon to be converted with carbon in a reaction to form silicon carbide,wherein a recrystallization firing is performed at greater than 2000.degree. C.