摘要:
A ceramic porous body is provided, inclusing a plurality of pores formed in a ceramic substrate at a specified porosity. A pore part is discriminated from a non-pore part by binarizing a cross-sectional plane image of the substrate by image analysis. When a center line passing the central part of the pore part is drawn, the porosity (ε (%)), a mean width (DP (μm)) of the pore part represented by a mean value of a distance, between outlines specifying the pore part, perpendicular to the center line, a mean length (L (μm)) of the pore part represented by a mean value of a length of the center line between adjacent branch points and a length of the center line between an end of the center line and the branch point, and a mean pore size (DH (μm)) satisfy a specified relationship.
摘要:
A silicon carbide-based porous material is provided, including silicon carbide particles as an aggregate, metallic silicon and an oxide phase containing Si, Al and an alkaline earth metal. The silicon carbide-based porous material is high in porosity and strength and superior in oxidation resistance and thermal shock resistance and, when used as a filter, has a very low risk of fluid leakage causing defects such as cuts and the like, as well as a low pressure loss.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A silicon carbide porous body of the present invention, comprising silicon carbide particles and metallic silicon bonded together in such a manner that pores are retained between the silicon carbide particles and/or between the silicon carbide particle and metallic silicon, wherein an oxide phase containing oxides of silicon, aluminum, and alkaline earth metal is buried in at least some of fine pore portions having a minimum distance of 10 μm or less between the surfaces of the silicon carbide particles or between the surfaces of the silicon carbide particle and metallic silicon among the pores, and a ratio of a total volume of portions in which the oxide phase is not buried among the fine pore portions is 20% or less with respect to a total volume of portions in which the oxide phase is not buried among the pores including the fine pore portions.
摘要:
A ceramic porous body having plural pores formed in a ceramic substrate at a specified porosity. A pore part 1 is discriminated from a non-pore part 2 by binarizing a cross-sectional plane image of the substrate by image analysis. When a center line 3 passing the central part of the pore part 1 is drawn, the porosity (ε (%)), a mean width (DP (μm)) of the pore part represented by a mean value of a distance, between outlines specifying the pore part (1), perpendicular to the center line 3, a mean length (L (μm)) of the pore part represented by a mean value of a length of the center line 3 between adjacent branch points 4 and a length of the center line 3 between an end 5 of the center line 3 and the branch point 4, and a mean pore size (DH (μm)) satisfy a specified relation.
摘要:
A silicon carbide porous body of the present invention, comprising silicon carbide particles and metallic silicon bonded together in such a manner that pores are retained between the silicon carbide particles and/or between the silicon carbide particle and metallic silicon, wherein an oxide phase containing oxides of silicon, aluminum, and alkaline earth metal is buried in at least some of fine pore portions having a minimum distance of 10 μm or less between the surfaces of the silicon carbide particles or between the surfaces of the silicon carbide particle and metallic silicon among the pores, and a ratio of a total volume of portions in which the oxide phase is not buried among the fine pore portions is 20% or less with respect to a total volume of portions in which the oxide phase is not buried among the pores including the fine pore portions.
摘要:
The silicon carbide-based catalytic body of the present invention comprises: a porous body of given shape comprising a first bonded structure formed by bonding a large number of silicon carbide particles as an aggregate to each other in a state that a large number of fine pores are present, and a catalyst containing an alkali metal and/or an alkaline earth metal, loaded on the porous body, characterized in that the catalyst is loaded via a crystalline coating film comprising an oxide and formed on at least part of the surfaces of the silicon carbide particles forming the first bonded structure. In the catalytic body, the catalyst such as NOx occlusion catalyst or the like, loaded thereon can maintain its activity over a long period.
摘要:
A silicon carbide based porous material (1) containing silicon carbide particles (2) as an aggregate and metallic silicon (3) as a bonding material and having a number of pores (5) formed by them, characterized in that it has an oxide phase (4) in at least a part of the pore (5), and the oxide phase (4) contains respective oxides of silicon, aluminum and an alkaline earth metal and contains substantially no alkaline earth metal silicate crystal phase; a method for producing the above porous material; and a honeycomb structure comprising the silicon carbide based porous material. The above porous material is capable of effectively inhibiting the corrosion by an acid (especially acetic acid) used in the operation of carrying a catalyst, that is, is improved in the resistance to an acid.