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AssigneeNGK Insulators, Ltd.
InventorsYasushi Kato, Yasushi Noguchi, Masato Ogawa
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A honeycomb structure constituted by porous cell walls which form a cell group consisting of a plurality of cells adjacent to each other, and a honeycomb outer wall which surrounds and holds the outermost peripheral cells located at the circumference of the cell group, characterized in that the porosity is 5% to less than 30%, the basic wall thickness (Tc) of the cell walls is 0.030 mm≦Tc<0.076 mm, the average surface roughness (Ras) of the outer wall is 0.5 μm≦Ras<10 μm, and/or the average height (RzDINs) on the surface of the outer wall from a local maximum point to a next local minimum point is 5 μm≦RzDINs≦50 μm; and a process for producing such a honeycomb structure using a raw material containing at least a talc component and a kaolin component, the talc component containing a coarse particle talc having an average particle diameter of 7 μm or more and a fine particle talc having an average particle diameter of ⅔ or less of that of the coarse particle talc, the kaolin component containing a coarse particle kaolin having an average particle diameter of 7 μm or more and a fine particle kaolin having an average particle diameter of ⅔ or less of that of the coarse particle kaolin. Thus, there can be provided a honeycomb structure which satisfies requirements of improved purification ability, erosion resistance and improved canning property at a good balance and which is suitably used particularly in a carrier for catalyst for purification of automobile exhaust gas, etc.
A honeycomb structure constituted by
A process for producing a honeycomb structure constituted by porous cell walls which form a cell group consisting of a plurality of cells adjacent to each other, and a honeycomb outer wall which surrounds and holds the outermost peripheral cells located at a circumference of the cell group, in which honeycomb structure a porosity is 5% to less than 30%, a basic wall thickness (Tc) of the cell walls is 0.030 mm≦Tc<0.076 mm, an average surface roughness (Ras) of the outer wall is 0.5 μm≦Ras≦10 μm, and/or an average height (RzDINs) on the surface of the outer wall from a local maximum point to a next local minimum point is 5 μm≦RzDINs≦50 μm, the process being characterized in that production is conducted using a raw material containing at least a talc component and a kaolin component, the talc component containing coarse particle talc having an average particle diameter of 7 μm or more and fine particle talc having an average particle diameter of ⅔ or less of that of the coarse particle talc, the kaolin component containing coarse particle kaolin having an average particle diameter of 7 μm or more and fine particle kaolin having an average particle diameter of ⅔ or less of that of the coarse particle kaolin.
Dependencies are inferred from the claim text.