Title:
【発明の名称】内燃機関に使用する触媒コンバータの製造方法
Document Type and Number:
Japanese Patent JP2003526034
Kind Code:
A
Abstract:
A method of manufacturing a catalytic converter for purifying exhaust gases from an internal combustion engine wherein the converter exhibits a monolithic ceramic substrate surrounded by a supporting mat. The method includes the steps of: wrapping the substrate in a sufficient amount of supporting mat material and inserting the wrapped substrate into the metal shell; forming a cylindrical metal shell having an inner surface exhibiting substantially the same curvature as the wrapped substrate; compressively closing the metal shell around the wrapped substrate to an optimized mat density range thereby resulting in the supporting mat exhibiting a substantially uniform and maximum safe compressive stress on the substrate; and, securing together metal shell to provide a gas tight seal and to hold the compressive stress. The optimized mat density range determined by plotting the mat density-mat holding pressure relationship and the mat density-retained cyclic strength ratio relationship of the supporting mat material on a common graph and selecting an optimized range on the mat density-mat holding pressure, and thereafter obtaining the corresponding optimized mat density range.
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Inventors:
Schmidt, Paul S
Application Number:
JP2000510969A
Publication Date:
September 02, 2003
Filing Date:
August 31, 1998
Export Citation:
Assignee:
Corning Incorporated
International Classes:
B01D53/86; B01D53/94; B01J33/00; F01N3/28; (IPC1-7): F01N3/28; B01D53/86; B01J33/00
Attorney, Agent or Firm:
Seiji Yanagida (1 person outside)