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US 8,728,607 B2Granted
Ceramic honeycomb structure and its production method
AssigneeHitachi Metals, Ltd.
InventorShunji Okazaki
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Abstract
A ceramic honeycomb structure comprising a ceramic honeycomb body having cell walls defined by a large number of longitudinally extending cells, and an outer peripheral wall formed on an outer peripheral surface of the ceramic honeycomb body, the outer peripheral wall being formed by coating longitudinally extending grooves defined by cell walls on the outer peripheral surface of the ceramic honeycomb body with a coating material, and the outer peripheral wall having higher hardness in its outer peripheral portion than in its inside portion in a thickness direction.
Claims3
A ceramic honeycomb structure, comprising:
- a ceramic honeycomb body having cell walls defining longitudinally extending cells, and
- an outer peripheral wall formed on the outer peripheral surface of said ceramic honeycomb body, said outer peripheral wall being formed by coating longitudinally extending grooves defined by cell walls on the outer peripheral surface of the ceramic honeycomb body with a coating material comprising colloidal silica having an average particle size of 10-40 nm and ceramic particles selected from the group consisting of cordierite and amorphous silica, and said outer peripheral wall having a thickness of 1.5-5 mm and having higher hardness in its outer peripheral portion than in its inside portion in a thickness direction, wherein the B-type durometer hardness (ASTM D2240) of said outer peripheral wall is 90-95 in said outer peripheral portion, and 85-90 in said inside portion,
- wherein the isostatic strength and the heat shock resistant temperature of said ceramic honeycomb structure are 2 MPa or more and 600° C. or higher, respectively, and wherein said outer peripheral wall is formed by drying it with hot air at 150-400° C.
Dependencies are inferred from the claim text.