Patent ID: 8173054
Filing Date: 2012-05-08
Classification: B01D,B01J,C04B,F01N,Y02T,Y10T

Abstract:
1. A method for producing a silicon carbide-based porous material, comprising: providing a mixed raw material containing silicon carbide particles and metallic silicon; adding inorganic microballoons containing Si and Al and a compound containing an alkaline earth metal to the mixed raw material to form a mixture; forming the mixture into a formed material having an intended shape; and calcining and firing the formed material to melt the inorganic microballoons and to obtain a porous material having a porous structure comprising silicon carbide aggregate articles bonded by metallic silicon articles constituting necking portions between the bonded silicon carbide aggregate particles, wherein an oxide phase containing Si, Al and an alkaline earth metal is present in and strengthening the necking portions, and is present at least on one of (i) surfaces of the silicon carbide particles and surfaces of the metallic silicon and (ii) at circumferences of the silicon carbide particles and circumferences of the metallic silicon; wherein the compound containing an alkaline earth metal is added, per 100 parts by mass of the inorganic microballoons added, by 10 to 25 parts by mass in terms of an amount of MgO when the alkaline earth metal contained in the compound containing an alkaline earth metal is Mg, by 14 to 35 parts by mass in terms of an amount of CaO when the alkaline earth metal is Ca, by 26 to 64 parts by mass in terms of an amount of SrO when the alkaline earth metal is Sr, or by 38 to 95 parts by mass in terms of an amount of BaO when the alkaline earth metal is Ba.