Honeycomb filter and process for production thereof
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/18
B01J-027/224
B32B-003/12
B32B-003/20
출원번호
US-0258808
(2002-02-27)
우선권정보
JP-0057325 (2001-03-01)
국제출원번호
PCT/JP02/01800
(2002-02-27)
국제공개번호
WO02/07010
(2002-09-12)
발명자
/ 주소
Harada, Takashi
Hamanaka, Toshiyuki
출원인 / 주소
NGK Insulators, Ltd.
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
22인용 특허 :
5
초록▼
A honeycomb filter is composed mainly of silicon carbide or of metallic silicon and silicon carbide; the filter being formed by bonding a plurality of honeycomb segments each of which has a plurality of through-holes being partitioned by porous partition walls. The filter is plugged alternately at t
A honeycomb filter is composed mainly of silicon carbide or of metallic silicon and silicon carbide; the filter being formed by bonding a plurality of honeycomb segments each of which has a plurality of through-holes being partitioned by porous partition walls. The filter is plugged alternately at the exhaust gas inlet face and exhaust gas outlet face of honeycomb segments. Each two adjacent honeycomb segments are contacted with each other at each a portion of their sides facing each other. They are bonded with each other at least at part of each portion of said sides other than the contacted portion through a bonding material having a strength lower than that of a basal body of honeycomb segment. Thus, the thermal stresses generated among the respective portions constituting the filter is reduced. The generation of cracks, etc. can be also prevented considerably.
대표청구항▼
1. A honeycomb filter obtained by bonding a plurality of honeycomb segments each having a plurality of through-holes which are separated from each other by porous partition walls and which are plugged alternately at the exhaust gas inlet face and exhaust gas outlet face of honeycomb segment,characte
1. A honeycomb filter obtained by bonding a plurality of honeycomb segments each having a plurality of through-holes which are separated from each other by porous partition walls and which are plugged alternately at the exhaust gas inlet face and exhaust gas outlet face of honeycomb segment,characterized in that each two adjacent honeycomb segments are allowed to contact with each other at each portion of their sides facing each other and are bonded with each other at least at part of each portion of said sides other than the contacted portion via a bonding material having a strength lower than that of a basal body of honeycomb segment. 2. A honeycomb filter according to claim 1, wherein the each portion of said sides other than the contacted portion is provided so as to include at least a whole part of said sides opening to the gas inlet face of honeycomb segment. 3. A honeycomb filter according to claim 2, wherein the each portion of said sides other than the contacted portion includes at least the whole part of said sides leading to the exhaust gas inlet face of honeycomb segment and the bonding material is provided at part of the each portion of said sides other than the contacted portion. 4. A honeycomb filter according to claim 1, wherein the each portion of said sides other than the contacted portion is provided so as to include at least a whole part of said sides opening to the exhaust gas inlet face of honeycomb segment, the exhaust gas outlet face of honeycomb segment and an outer surface of honeycomb filter. 5. A honeycomb filter according to claim 1, wherein at least one of the each two adjacent honeycomb segments has a projection at a portion of its side facing one side of the other honeycomb segment and contacts, via said projection, with a portion of said side of the other adjacent honeycomb segment. 6. A honeycomb filter according to claim 1, wherein at least one of the each two adjacent honeycomb segments has a heat-conductive member composed of the same material as that of honeycomb segment at a portion of its side facing one side of the other honeycomb segment and contacts, via said heat-conductive member, with a portion of said side of the other adjacent honeycomb segment. 7. A honeycomb filter according to claim 1, wherein the honeycomb segments are composed mainly of silicon carbide or of metallic silicon and silicon carbide. 8. A honeycomb filter according to claim 1, wherein the bonding material is composed mainly of a heat-resistant inorganic compound. 9. A honeycomb filter according to claim 1, characterized in that the partition walls have a metal having a catalytic activity, loaded thereon. 10. A process for producing a honeycomb filter, characterized bykneading a powder material composed of a ceramic and/or a metal, a binder and water to obtain a puddle and molding the puddle to obtain a honeycomb structure having a plurality of through-holes separated by partition walls from each other,drying the honeycomb structure and then plugging the plurality of through-holes alternately at the exhaust gas inlet face and exhaust gas outlet face of honeycomb structure to obtain a dried honeycomb segment,bonding, to a portion of each side of the dried honeycomb segment, a heat-conductive member composed of the same material as that of the dried honeycomb segment, followed by drying and firing to obtain a composite honeycomb segment,contacting the heat-conductive member-provided honeycomb segment, via the heat-conductive member, with a portion of a side of other adjacent honeycomb segment facing the former honeycomb segment, and providing, at least at part of each portion of the two sides facing each other, other than the contact portion, a bonding material having a strength lower than that of a basal body of honeycomb segment, to obtain a unified body. 11. A process for producing a honeycomb filter according to claim 10, wherein the powder material is composed mainly of silicon carbide. 12. A process for produ cing a honeycomb filter according to claim 10, wherein the powder material is composed mainly of metallic silicon and silicon carbide. 13. A process for producing a honeycomb filter according to claim 10, wherein the bonding material is composed mainly of a heat-resistant inorganic compound. 14. A process for producing a honeycomb filter, characterized bykneading a powder material composed of a ceramic and/or a metal, a binder and water to obtain a puddle and molding the puddle to obtain a honeycomb structure having a plurality of through-holes separated by partition walls from each other,drying the honeycomb structure and then plugging the plurality of through-holes alternately at the exhaust gas inlet face and exhaust gas outlet face of honeycomb structure to obtain a dried honeycomb segment,subjecting the dried honeycomb segment to a cutting operation to form a projection at each side of the dried honeycomb segment, and conducting firing to obtain a honeycomb segment,contacting each projection formed at each side of the honeycomb segment, with a portion of a side of other adjacent honeycomb segment facing the former honeycomb segment, and providing, at least at part of each portion of the two sides facing each other, other than the contacted portion, a bonding material having a strength lower than that of the dried honeycomb segment, to obtain a unified body. 15. A process for producing a honeycomb filter according to claim 14, wherein the powder material is composed mainly of silicon carbide. 16. A process for producing a honeycomb filter according to claim 14, wherein the powder material is composed mainly of metallic silicon and silicon carbide. 17. A process for producing a honeycomb filter according to claim 14, wherein the bonding material is composed mainly of a heat-resistant inorganic compound.
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