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AssigneeHitachi Metals, Ltd.
InventorsHirohisa Suwabe, Yasuhiko Otsubo, Toshiaki Kimura
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A ceramic honeycomb structure comprising a ceramic honeycomb body comprising axial grooves on its periphery and cell walls constituting a larger number of flow paths inside the grooves, and a peripheral wall layer covering the grooves, wherein there are stress release portions at least partially in the peripheral wall layer and/or between the peripheral wall layer and the grooves. The thermal expansion coefficient of the peripheral wall layer is preferably smaller than those of the cell walls in a radial direction. The peripheral wall layer is preferably formed on the ceramic honeycomb body formed by removing a peripheral wall from a ceramic green body, before or after firing the ceramic honeycomb body.
A ceramic honeycomb structure comprising a ceramic honeycomb body comprising axial grooves on a periphery of said ceramic honeycomb body and cell walls constituting a plurality of flow paths, and a peripheral wall layer covering said grooves, wherein there are voids as stress release portions at least partially between said peripheral wall layer and said grooves, and wherein the number of grooves having said voids is 7% or more of the total number of the grooves.
A ceramic honeycomb structure comprising a ceramic honeycomb body comprising axial grooves on a periphery of said ceramic honeycomb body and cell walls constituting a plurality of flow paths, and a peripheral wall layer covering said grooves, wherein a thermal expansion coefficient of said peripheral wall layer is smaller than those of said cell walls in a radial direction,
A ceramic honeycomb structure comprising a ceramic honeycomb body comprising axial grooves on a periphery of said ceramic honeycomb body and cell walls constituting a plurality of flow paths, and a peripheral wall layer covering said grooves, wherein said peripheral wall layer is made of a mixture comprising amorphous silica particles and an amorphous oxide matrix, and wherein said amorphous oxide matrix is formed from colloidal silica and/or colloidal alumina,
A coating material for forming a peripheral wall layer of a ceramic honeycomb structure, comprising 100 parts by mass of amorphous silica and 2 to 35 parts by mass (on a solid basis) of colloidal silica and/or colloidal alumina, wherein said amorphous silica has a thermal expansion coefficient of 10.0×10−7/° C. or less, an average particle size of 1 to 100 μm and an aspect ratio of 10 or less.
Dependencies are inferred from the claim text.