Honeycomb structural body for exhaust gas purification
AssigneePirelli & C. Eco Technology S.p.A.
InventorsTiziano Ambrosini, Agustin Sin Xicola
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Abstract
A honeycomb structural body and a method for the manufacturing thereof. The manufacturing method includes (i) providing a plurality of silicon carbide honeycomb segments, each having a cell structure and at least one outer wall; (ii) subjecting the honeycomb segments to an oxidizing thermal treatment forming a surface layer of silicon oxides on the at least one outer wall; and (iii) bonding the plurality of oxidized honeycomb segments so as to form the honeycomb structural body in the substantial absence of organic binders with the interposition of a sealing material including a mixture of one or more silicon carbide powders, one or more ceramic fibers, and one or more inorganic binders.
Claims28
1-27. (canceled)
A method for manufacturing a honeycomb structural body comprising:
- (i) providing a plurality of silicon carbide honeycomb segments each having a cell structure and at least one outer wall;
- (ii) subjecting said honeycomb segments to an oxidizing thermal treatment forming a surface layer of silicon oxides on said at least one outer wall;
- and
- (iii) bonding said plurality of oxidized honeycomb segments so as to form said honeycomb structural body in substantial absence of organic binders, with interposition of a sealing material comprising a mixture of one or more silicon carbide powders, one or more ceramic fibers, and one or more inorganic binders.
A honeycomb structural body comprising a plurality of honeycomb segments each having a cell structure and at least one outer wall, wherein said honeycomb segments are bonded to each other at the outer walls by the interposition of a sealing layer cooperating with a surface layer of silicon oxides formed on said outer walls, wherein said sealing layer comprises a sealing material comprising a mixture of one or more silicon carbide powders, one or more ceramic fibers, and one or more inorganic binders, and wherein said sealing material is substantially free of organic binders.
Dependencies are inferred from the claim text.