Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1997-09-09
1999-06-22
Krynski, William
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428116, 428117, 428119, 428188, 428690, 428913, 502439, 156 89, 55282, 55523, B32B 900
Patent
active
059141875
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a ceramic structural body, and more particularly it proposes an improvement in the structure of the ceramic structural body made by piercing a plurality of through-holes in parallel to each other along a longitudinal direction of a member, such as a ceramic honeycomb structural body, monolithic structural body and the like.
DISCUSSION OF BACKGROUND INFORMATION
In general, the ceramic structural body such as a ceramic honeycomb structural body and the like formed by piercing a plurality of through-holes in the longitudinal direction of the member in parallel to each other is used as a filter for purifying exhaust gas discharged from vehicles, factories and the like.
This ceramic structural body has such an end face that the open-close condition of the through-holes shows a checkered pattern (the state that adjacent through-holes are alternately in the open-close condition). That is, these through-holes are sealed at either only one of their end faces, and adjacent through-holes are opened or closed from each other to form the checkered pattern. Therefore, when one through-hole is opened at one end face, the other end face is sealed, while the adjacent through-hole thereto is sealed at one end face and opened at the other end face.
Moreover, the ceramic structural body is such a porous body that when a gas to be treated is flown from either one end face of each of the above through-holes, the treated gas enters into an adjacent through-hole passing through porous partition walls on the way toward the other end face and then discharges out from such other end face. That is, the ceramic structural body is made possible to mutually pass the gas through the partition wall separating the through-holes. Therefore, the gas to be treated easily passes into the other through-hole in the structural body, so that the gas passes through different through-holes at the inlet side and outlet side.
Therefore, when the exhaust gas is passed through the above ceramic structural body, particle substances (particulate) in the exhaust gas are caught and purified in the partition wall portion while passing the exhaust gas flown from one-side end face through the partition wall toward the outlet port. With the purifying action of the exhaust gas, the ceramic structural body degrades the pass of the gas because the particulate is collected and accumulated in the partition wall at the inlet port side to gradually create clogging. Therefore, the ceramic structural body requires a treatment for periodically burning and removing the particulate accumulated on the partition wall, which results in the clogging, by a heating mechanism such as burner, heater or the like (hereinafter simply referred to as "regeneration").
The above ceramic structural body, however, causes nonuniform temperature distribution inside the structural body due to local heat generation accompanied with nonuniform heating process and abnormal burning of particulate, thermal shock given by sudden temperature change of exhaust gas and the like so as to bring about the action of thermal stress. As a result, the above ceramic structural body has encountered such problems that crack generation and hence molten loss are invited and finally led to breakage so as to impede collection of particulate.
On the contrary, hitherto, as means for solving the above problems, there has been proposed, for example, a method for decreasing thermal stress acting on a ceramic structural body by dividing the ceramic structural body into a plurality of ceramic members on the face perpendicular to the axis or the face in parallel with the axis (see JP-A-60-65219). Moreover, there has been proposed a divided ceramic structural body having improved property for sealing the exhaust gas by inserting a non-adhesion sealing member in a gap produced between the mutual ceramic members in this divided-type ceramic structural body (hereinafter referred to as "divided ceramic structural body") (see JU-A-1-63715).
According to the above respective proposals
REFERENCES:
English language abstract in connection with Japanese Patent No. 7-54643, Feb. 28, 1995.
English language abstract in connection with Japanese Patent No. 7-59885, Jun. 28, 1995.
English language abstract in connection with Japanese Patent No. 07-138533, May 30, 1995.
English language abstract in connection with Japanese Patent No. 5-115721, May 14, 1993.
English language abstract in connection with Japanese Patent No.60-65219, Apr. 15 1985.
English language abstract in connection with Japanese Utility Model Laid-Open No. 1-63715, Apr. 24, 1989.
International Search Report in connection with International Application No. PCT/JP96/00042 (in Japanese and English language), Jan. 12, 1996.
Iwahiro Seiki
Naruse Kazuya
Ohno Satoshi
Okazoe Hiroshi
Shimato Koji
Bahta Abraham
Ibiden Co. Ltd.
Krynski William
Nissan Diesel Motor Co., Ltd.
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