Silicon carbide based porous material and method for production thereof
AssigneeNGK Insulators, Ltd.
InventorsYuuichirou Tabuchi, Masahiro Furukawa, Kenji Morimoto, Shinji Kawasaki
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Abstract
A silicon carbide-based porous material characterized by comprising silicon carbide particles as an aggregate, metallic silicon and an oxide phase containing Si, Al and an alkaline earth metal; it is high in porosity and strength and superior in oxidation resistance and thermal shock resistance and, when used as a filter, is very low in risk of having defects such as cuts (which cause leakage of fluid) and the like, as well as in pressure loss.
Claims8
A method for producing a silicon carbide-based porous material, comprising adding, to a mixed raw material containing silicon carbide particles and metallic silicon, inorganic microballoons containing Si and Al and a compound containing an alkaline earth metal, forming the resulting mixture into a formed material of intended shape, and calcinating and firing the formed material to melt the inorganic microballoons to obtain a porous material of porous structure wherein an oxide phase containing Si, Al and an alkaline earth metal is on surfaces of and/or at circumferences of the silicon carbide particles and/or the metallic silicon.
Dependencies are inferred from the claim text.