Title:
METHOD OF MANUFACTURING CATALYTIC CONVERTER
Document Type and Number:
WIPO Patent Application WO1999013204
Kind Code:
A3
Abstract:
A method of manufacturing a catalytic converter (10) for purifying exhaust gases from an internal combustion engine wherein the converter includes monolithic ceramic substrate (14) surrounded by a supporting mat. The method includes the steps of: wrapping the substrate (14) in a sufficient amount of supporting mat material and inserting the wrapped substrate into the metal shell (12); 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:
SCHMITT PAUL S
Application Number:
PCT/US1998/018033
Publication Date:
May 12, 2005
Filing Date:
August 31, 1998
Export Citation:
Assignee:
CORNING INC (US)
International Classes:
B01D53/86; B01D53/94; B01J33/00; F01N3/28; (IPC1-7): B01D53/34; B21D53/00; F01N3/10
Foreign References:
| US4070158A | 1978-01-24 | |||
| US4148120A | 1979-04-10 | |||
| US4400860A | 1983-08-30 | |||
| US4865818A | 1989-09-12 | |||
| US4343074A | 1982-08-10 | |||
| US5096111A | 1992-03-17 | |||
| US5119551A | 1992-06-09 | |||
| US5329698A | 1994-07-19 | |||
| US5346675A | 1994-09-13 | |||
| US5302355A | 1994-04-12 | |||
| US5666726A | 1997-09-16 | |||
| US5729902A | 1998-03-24 |
Other References:
See also references of EP 1549416A4
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