DE10211424A1 - Honeycomb substrate comprises metal sheet assembly held to casing by connectors in its flatter regions and by direct connection where curvature is high - Google Patents

Abstract

The metal sheet assembly (3) is held to the casing by connectors (7) at each cross sectional region of large radius of curvature (5.1, 5.3). In cross sectional regions of small radii of curvature (5.2, 5.4), the sheet is connected directly to the casing. There is a connector in all regions of greatest radius of curvature, e.g. the flanks. Connections to the sheets and casing are bonded and offset. They are hard soldered, brazed or welded. The connectors (7) include expansion slots away from the bonding regions. Passivation is employed at the bonds. Sheet ends face the casing, and are bonded using the connectors. The casing is oval or polygonal. Corresponding casing and sheet lengths differ. The connector has an axial expansion differing from that of the lengths of the casing or sheets. Connector thickness is 0.1-1mm, especially 0.3-0.7.

Description

The present invention relates to a honeycomb body with a housing and metal foils arranged therein. The metal foils are at least partially structured and / or arranged so that a fluid can flow through it Form channels. The housing has sections with different Radii of curvature. Such honeycomb bodies are used in particular as catalyst Carrier body used in exhaust systems of mobile internal combustion engines.

This invention relates to honeycomb bodies, which are not cylindrical are constructed, but have a different cross section. In this context, in particular, configurations are meant which are at least one have flat housing section or those whose cross sections are below subsume the term "polygon" or polygon, where the "corners" a small radius of curvature and the areas that the "corners" connect, have a large radius of curvature or are flat. Such The design of the housing means that the housing has a cross-section has different thermal expansion behavior.

The housing, which is used to fix the honeycomb body in the exhaust system Internal combustion engine serves, at least partially encloses metal foils, which have a sufficiently large surface area for the implementation of contained in the exhaust gas Should provide pollutants and usually from an aluminum and Chromium-containing high-temperature corrosion-resistant steel are made. The metal foils generally have a very low surface-specific Heat capacity so that the metal foils turn one from the case show different thermal expansion behavior. Considering of the pressure surges propagating in the exhaust gas flow, which originate in have the combustion processes in the internal combustion engine, and the external vibration incentives through, for example, the road surface a permanent and hard-wearing design of the joining technology Connection of the metal foils with the housing in the central interest.

To ensure permanent technical connections between Metal foils and a cylindrical housing is used for example in the DE 39 30 680 an elastic mounting of the metal foils in the housing proposed. The stack of metal foils is not included over the entire circumference soldered to the housing, but from two or more bearings elastic to the housing suspended. The bearings are designed to accommodate the relative movements between housing and honeycomb body, for example, by heating as well the resulting growth of the stack arise in the radial direction or the resulting increase in the scope of the Honeycomb body, also in the tangential direction. The bearings consist of Leaf springs evenly distributed over the circumference. The sheet stack is through the storage is held at a distance of 2-10 mm from the housing, with a Longitudinal section of the leaf springs with the stack of metal foils and one opposite longitudinal section of the leaf springs is connected to the housing.

However, it is assumed that the housing is above the cross section has a relatively uniform thermal expansion behavior, as well as that Behavior of the centrally arranged metallic honeycomb structure as uniform is looked at. For this reason, this document does not contain any information on how the bearings depend on a different thermal Expansion behavior are to be arranged.

Proceeding from this, it is an object of the present invention to Specify honeycomb body that is durable, thermally and dynamically resilient Connection of the metal foils to a housing with a non-cylindrical cross section guaranteed.

This object is achieved by a honeycomb body with the features of Claim 1. Further advantageous embodiments of the honeycomb body are in the dependent claims described, the features shown there can occur individually or in any combination with one another.

The honeycomb body accordingly comprises a housing and arranged therein Metal foils, which are at least partially structured and / or arranged so that for channels through which fluid can flow are formed. That comes in particular as a fluid Exhaust gas from a mobile internal combustion engine (e.g. gasoline or diesel engine) in Consider which solid particles, e.g. B. carbon black. The housing has cross-sectional areas with different radii of curvature on. According to the invention is now in between the metal foils and the housing at least one, preferably each, cross-sectional area with a large one Radius of curvature arranged at least one connecting element. On Cross-sectional area with a large radius of curvature either belongs to one practically flat section of the housing or to a housing section whose The center of curvature is in any case outside the honeycomb body. Are there the metal foils in at least one cross-sectional area with a small one Radius of curvature, d. H. one lying inside the honeycomb body Center of curvature, directly connected to the housing. "Directly connected" means in this context that no connection broker in the form of a metallic Foil or the like is arranged in this cross-sectional area, but each end of the metal foils lying there thus rests on the housing, and there is optionally connected to the housing by technical joining. "Directly connected "means very well that in this cross-sectional area Coatings (e.g. ceramic, solder, adhesive or the like) can be provided, but usually this is essentially a significant "spring Property "is missing.

In studies regarding such non-cylindrical honeycomb bodies or Housing, it was found that in particular the cross-sectional areas of the Housing tend to strong deformation, which is a particularly large Have radius of curvature or are flat. As a result, this Cross-sectional areas with the large radius of curvature during the heating process move significantly away from its original position while the Cross-sectional areas of the housing with a small radius of curvature almost unchanged stay. This is probably the reason why such honeycomb bodies So far, especially in long-term tests, they showed a lower fatigue strength than cylindrical honeycomb body. As a result, according to the invention proposed that a connection of the metal foils to the cross-sectional areas with a large radius of curvature is not executed directly, but a Connection element to compensate for the different thermal Expansion behavior is "interposed". That at least one Accordingly, the connecting element is on the one hand with the metal foils and on the other hand with the Housing connected, this relative to a movement of the housing the metal foils, for example by elastic or plastic deformation, compensated. Depending on the size of the radius of curvature and / or the number of Cross-sectional areas with a large radius of curvature are in one A plurality of cross-sectional areas with a large radius of curvature Arrange fasteners. The arrangement of is particularly preferred one connecting element in all cross-sectional areas with large Radius of curvature. The distinction between large and small Radius of curvature essentially depends on the shape of the housing and the shape of the housing resulting thermal expansion behavior dependent, but one can recognize small radii of curvature by the fact that the centers of curvature in the The interior of the housing lies while the large radii of curvature lie outside of the housing. The upper limit of a large radius of curvature lies in Infinite, d. H. that the associated cross-sectional area is flat, straight or is just.

According to a further embodiment, at least one is in each case Connection element in all cross-sectional areas of the housing with the largest Radius of curvature arranged. This affects, for example, the design of a housing with a plurality of different radii of curvature, one "Dynamic" fixing of the metal foils to the housing only in the Cross-sectional areas with the largest radii of curvature is formed. This is one hand ensures that there is sufficient space to connect the connecting element is available on the case, on the other hand, it will also be an expensive one Manufacture of such a honeycomb body avoided, but still sufficient fatigue strength is ensured with regard to the connection between the metal foil and the housing is.

The configuration of the honeycomb body in which the Cross-sectional area with the large or largest radius of curvature is a flank. That means that the fasteners are in a straight line Cross-sectional area of the housing are arranged. This allows a particularly simple one Design of the connecting element, thereby reducing the manufacturing costs of such Honeycomb body can be further reduced. In addition, there are enough large contact surfaces that provide a permanent connection between the cladding films Connecting element or between the housing and the connecting element to ensure. It should also be noted here that the Radius of curvature is infinitely large.

It is further proposed that the at least one connecting element of the Honeycomb body at least one connection area and at least one Has connecting section, wherein in the at least one connection area a technical connection with the metal foils and in the at least one Connection section a technical connection with the housing is executed. The at least one connection area and the at least one a connecting section preferably in the direction of an axis of the honeycomb body spaced from each other. In this particularly preferred embodiment of the Honeycomb body are therefore the connecting elements on the circumference of the Stack with the metal foils so that they are only in the cross-sectional areas are arranged with a relatively large radius of curvature, and the Connections of the connecting elements with the metal foils on the one hand and the housing on the other hand are axially spaced apart. This has the advantage that for example, a relatively unimpeded stretching or shrinking of the Honeycomb body is allowed in the circumferential direction. The axially spaced apart Connection of the connecting elements with the metal foils on the one hand or the housing on the other hand enables a low-stress expansion of the honeycomb body in radial direction. The axial expansion freedom of the honeycomb body is thereby ensures that the honeycomb body does not match the entire length Fasteners is connected. The connecting elements themselves serve as one Type spiral springs, which the different thermal expansion behavior (which is especially in the cross-sectional areas with a large radius of curvature compensate). The distance from the connection area to The connecting section is preferably at least 15 mm, in particular at least 30 mm, with particularly long honeycomb bodies even more than 70 mm.

Precisely with regard to the aforementioned configuration of the honeycomb body it is particularly advantageous to use the joining connections as solder connections and / or weld connections. The connection is preferred of metal foil and connecting element by means of a powdered solder and the connection of the connecting element with the jacket tube by means of a Welded connection carried out. This offers, for example, the Possibility to use external welding treatment (e.g. Spot welding) of the housing with this.

According to a further embodiment, the at least one Connecting element at least one expansion slot, which is preferably outside of a Connection area of the connecting element arranged with the metal foils is. The arrangement of the at least one is also particularly preferred Expansion slot outside the connection section with the housing. The Alignment of the expansion slots can be in the circumferential direction and / or in the direction of Axis of the honeycomb body. The expansion slots offer the one hand Possibility of a different thermal expansion behavior of the Connecting element itself or the metal foils relative to the housing. at an expansion in the circumferential direction is, for example, axially aligned Expansion slots spread, while an analog behavior of in Expansion slots oriented in the circumferential direction in the case of axial relative movements between Metal foils and honeycomb body can be determined. Furthermore, the Expansion slots influence the bending stiffness of the connecting elements. This means that as the number of expansion slots increases, the Bending strength of the connecting elements decreases and in this way a relatively unobstructed one Expansion behavior of metal foils and / or housing is made possible. However, this reduction in bending stiffness is limited by the fact that a such fixation of the metal foils inside the housing also high dynamic Must withstand loads. Accordingly, the bending stiffness should be set that on the one hand a relatively unimpeded expansion of the honeycomb body thermal loads is guaranteed, on the other hand, a strong vibration of the Honeycomb body is prevented due to pressure fluctuations occurring in the exhaust gas. The configuration of the expansion slots with is particularly preferred Recesses at their end areas, which the expansion slots inside the Limit connecting element. The recess is essentially round and serves to prevent notches, which otherwise, for example due to high dynamic stress in the end areas of the Expansion slots could occur.

It is further proposed that the connection area of the at least one Connection element is limited by at least one passivation agent. As already explained above, there is a connection between metal foils and the Connection element preferably made with a powdered solder, which is first fixed with an adhesive and then as a result a thermal treatment liquefies and connects the neighboring parts. To ensure a defined connection of the metal foils to the connecting element guarantee, an exact limitation of the connection area is required. This is achieved, for example, in that a passivation layer and / or a specially shaped design of the material of the Connecting element is placed on the boundary of the connection area, which is a Prevent the solder from flowing out when heated. Such a flow of the solder to areas outside the predetermined Connection area has the consequence that on the one hand in the predetermined connection area Under certain circumstances, there is insufficient soldering material available to make a To ensure permanent connection of the metal foils to the connecting element. On the other hand, technical connections outside the Connection area possible. To prevent this, passivation layers (e.g. as ceramic coating or as an oxide coating) and / or constructive Measures (roughening the surface, shoulders, protrusions or the like) proposed regarding the connecting element itself.

According to yet another embodiment of the honeycomb body Metal foils each aligned at least with one end towards the housing, wherein all these ends with the at least one connecting element joining technology are connected. In principle it should be mentioned at this point that the metal foils in usually stacked and then bent, twisted and / or be wrapped. As a result, the stack of metal foils (or the Metal foils themselves) then takes a certain course, being here in particular a spiral, an S-shaped, a U-shaped or a V-shaped Course is called. For the basic production of such stacks, see in particular referenced documents DE 37 43 723, EP 0 245 737 and WO 90/03220, the The disclosure content is hereby also completely the subject of this description.

If you consider a spiral course, for example, one end of the stack of metal foils arranged inside, i.e. in the center, while the opposite ends are arranged near the housing, in particular these lie on the inner circumference of the housing. Now consider it For example, an S-shaped course, both ends of a metal foil can opposite inner sides of the housing. For U or V-shaped ones It may even be possible that both ends are very close to each other are arranged and thus all ends towards one side or towards one Cross-sectional area of the housing are aligned. Now all these ends with connected to the connecting element, this will flutter Ends due to the pressure fluctuations propagating in the exhaust gas flow avoided. The connection element also projects beyond its connection area all these ends of the metal foils and there is also a joining technology Connection with the adjacent "middle" sections of the metal foils also the relative position of the ends to the other, "middle", sub-areas of the Metal foils fixed, so that a change in the corresponding course of the Metal foils is prevented for a very long period of time.

With regard to the explicit design of the housing, an oval or a polygonal cross section preferred. Regarding the polygonal cross section preferably of alternatingly adjacent cross-sectional areas small and large radii of curvature. The number of Cross-sectional areas with small radii of curvature ("corners") are preferably 2, 4, 6 or 8.

According to yet another embodiment of the honeycomb body, the housing an extension and the metal foils a length in the direction of an axis of the Honeycomb body, the extent and the length of each other are executed differently. That means the case is on one face or on both ends of the honeycomb body over the length of the metal foils protrudes, in particular by 3 mm to 10 mm. However, this can also mean that the metal foils protrude over the housing in the direction of the axis (above one face or both). This protrusion is also in the range of 3 mm up to 10 mm.

It is further proposed that the at least one connecting element is a Has expansion in the direction of the axis, which depends on the extension of the Housing and / or the length of the metal foils is different. It is preferred that the at least one connecting element extends in the direction of the axis has which is smaller than the extension of the housing and / or the length of the Is metal foils. The connection area or is preferred Connecting section of the connecting element at or near the opposite one End faces of the honeycomb body arranged. A relatively small or narrow version Design of the connecting elements has the result that on the one hand the Manufacturing costs of such a honeycomb body can be reduced, but also on the other hand only a spatially limited heat conduction of the metal foils to the housing takes place. This also has an improved or accelerated heating of the Metal foils just after the cold start of the internal combustion engine.

In addition, it is further proposed that the at least one connecting element has a thickness of 0.1 mm to 1 mm, in particular from 0.3 mm to 0.7 mm. A such a configuration of the connecting element is sufficient for thermal and dynamic requirements, especially in the exhaust system more mobile Internal combustion engines, the connecting elements preferably also made of are metallic material.

Further advantages and particularly preferred configurations are described with reference described in more detail on the figures. However, it is noted that the The exemplary embodiments shown are only particularly preferred variants represent, to which the invention is not limited.

Show it:

Fig. 1 is an exploded view of one embodiment of the honeycomb body of the invention,

Fig. 2 is an exploded view of another embodiment of the honeycomb body of the invention,

Fig. 3 is a detail view of a connecting element between the metal foils and the housing,

Fig. 4 shows a cross section of another embodiment of a honeycomb body according to the invention,

Fig. 5 is a detailed view of a honeycomb body, and

Fig. 6 shows an embodiment of a connecting element.

Fig. 1 shows an exploded view of a honeycomb body 1 comprising a housing 2, two connecting members 7 and a stack of metal foils 3, which is S-shaped bent. The metal foils 3 are at least partially structured such that channels 4 are formed which run essentially parallel to an axis 11 of the honeycomb body 1 . The channels 4 are thus designed in a straight line from one end face 15 to the opposite 15 and accordingly have a channel length which corresponds approximately to the length 17 of the metal foils 3 . The metal foils 3 have ends 15 which form a flat side at the top and bottom in the illustrated embodiment of the stack.

The housing 2 has an extension 16 in the direction of the axis 11 and has an oval cross section. This oval cross-section is characterized by two flat cross-sectional areas 5.1 , 5.3 , which are essentially parallel to each other. Between these flat cross-sectional areas 5.1 , 5.3 (radius of curvature 6.1 , 6.3 is infinitely large here), a cross-sectional area 5.2 , 5.4 is arranged, which has a smaller radius of curvature 6.2 , 6.4 than the flat cross-sectional areas 5.1 , 5.3 . The housing 2 is preferably made of a metallic material and in particular has a wall thickness of 0.6 to 1.5 mm (in particular 0.8 to 1.2 mm).

The two connecting elements 7 are arranged between the centrally arranged stack of metal foils 3 and the housing 2 comprising the stack. The connecting elements 7 are fixed in the flat cross-sectional areas 5.1 and 5.3 . This has the consequence that the stack of metal foils 3 in cross-sectional areas 5.1 and 5.3 is connected to the housing 2 via the connecting elements 7 , while the metal foils 3 in cross-sectional areas 5.2 and 5.4 with the small radii of curvature 6.2 and 6.4 (“corners”) are connected directly rest on the housing 2 and / or are connected to these cross-sectional areas 5.2 and 5.4 by joining technology.

In the embodiment shown, the length 17 of the metal foils 3 , the extent 18 of the connecting elements 7 and the extent 16 of the housing 2 essentially correspond, so that these components form an almost flush end face 26 on both sides of the honeycomb body 1 .

Such a honeycomb body 1 serves in particular as a catalyst carrier body for converting pollutants contained in the exhaust gas of an internal combustion engine. In order to provide a sufficiently large specific surface area for this purpose, it is particularly advantageous to design the honeycomb body 1 with a channel density (number of channels 4 per unit cross-sectional area) of at least 800 cpsi ("cells per square inch"), preferably even with a channel density of at least 1200 cpsi. The volume (based on the outer shape with the channels 4 ) of such a honeycomb body 1 is essentially the amount of exhaust gas produced and thus also the combustion chamber volume (generally between 0.2 [in chainsaws, motorcycles] and 4 liters [in large cars] ) of the internal combustion engine. The honeycomb body 1 preferably has a volume which corresponds to from 0.1 to 1.2 of the total combustion chamber volume of the internal combustion engine. In the event that such a honeycomb body 1 is arranged near the internal combustion engine, in particular at a distance of less than 1.5 m from the outlet of the combustion chambers, such a honeycomb body 1 can be made with a volume of 0.01 to 0.2 of the total combustion chamber volume ,

Fig. 2 shows a further embodiment of a honeycomb body 1 according to the invention, which has a hexagonal cross section. Accordingly, the housing alternately has a cross-sectional area 5 , 1 , 5 , 3 , etc. with a large radius of curvature and cross-sectional areas 5.2 , 5.4 , etc. with a small radius of curvature ("corner"). To fix the stack of metal foils 3 in the housing 2 , four connecting elements 7 are used here, which on the one hand essentially extend over all free ends 15 of the metal foils 3 and on the other hand are arranged in the flat cross-sectional areas 5.1 , 5.3 , etc.

The connecting elements 7 each have a connection area 9 for forming a joining connection with the metal foils 3 and a connecting section 10 for attachment to the housing 2 . The connection area 9 and the connection area 10 are provided with a distance 12 from one another in the direction of the axis 11 (not shown). The connecting element 7 in the region of the distance 12 acts as a spiral spring for compensating for relative movements of the metal foils 3 relative to the housing 2 .

To ensure a predetermined bending behavior of the connecting elements 7 , a sharp delimitation of the connection areas 9 and the connecting section 10 is necessary, in particular if the joining of the connecting elements to the metal foils 3 on the one hand and the housing 2 on the other hand is carried out as a solder connection. To ensure such a sharp delimitation of the connection area 9 or the connecting section 10 , passivation layers 23 are used here, which prevent a flow of solder during the thermal treatment of the honeycomb body 1 beyond the delimitation. Such a passivation layer 23 comprises, for example, a ceramic coating (in particular an aluminum oxide coating), which can be applied, for example, by means of a flame spraying process. As an alternative or in combination with such a ceramic passivation layer 23 , metal oxide coatings can also be used, which can be generated, for example, by mechanical, chemical or thermal treatment of the connecting elements. In order to ensure that the honeycomb body 1 shrinks or expands in its circumferential direction, the connecting elements 7 are each additionally provided with an expansion slot 13 which extends from one edge of the connecting element to a shoulder 24 .

Fig. 3 shows a detailed view of the honeycomb body 1 near an end face 26 in partial section. Using this illustration, the mode of operation of paragraph 24 can be illustrated particularly well. While the connecting member 7 in the region of the connecting portion 10 rests directly on the housing 2 essentially causes the shoulder 24, that between the connecting element 7 and the housing 2 is formed near the end face 26 and in the connection region 9, a gap 25th It is particularly advantageous to align the honeycomb body in the exhaust system of an internal combustion engine such that the end face 26 with the intermediate space 25 points toward the exhaust gas entry side. The hot exhaust gas striking the end face 26 causes a considerable thermal expansion of the metal foils 3 in this area, particularly in the cold start phase of such an internal combustion engine, which is further intensified by the rapidly starting catalytic reaction at approximately 300 ° C. The intermediate space 25 accordingly offers the possibility of radial expansion of the centrally arranged stack of metal foils 3 , the bending properties of the connecting elements 7 being particularly effective. A "bypass" of exhaust gas is avoided since the shoulder 24 and the adjoining regions of the connecting elements 7 prevent exhaust gas from flowing past. In the cold start phase, the intermediate space 25 also has the advantage that heat transfer from the stack of metal foils 3 to the housing 2 is prevented, since the air or the exhaust gas located in the intermediate space 25 acts as a thermal insulator.

Fig. 4 shows a cross section through an alternative embodiment of the honeycomb body 1 according to the invention. Here too, alternating flat cross-sectional areas 5.1 , 5.3 , 5.5 and 5.7 can be seen, which are designed here as flanks 8 . The connecting elements 7 are in turn arranged in these cross-sectional areas with the largest radii of curvature 6.1 , 6.3 , 6.5 and 6.7 (infinitely large). In the cross-sectional areas 5.2 , 5.4 , 5.6 and 5.8 with the small radii of curvature 6.2 , 6.4 , 6.6 and 6.8 ("corners"), no connecting elements are arranged between the stacks of metal foils 3 and the housing 2 . There, the metal foils 3 lie directly on the inner wall of the housing 2 and are preferably connected to it by joining technology in order to ensure permanent fixation of the metal foils 3 in the interior of the housing 2 even under high thermal and dynamic loads on the honeycomb body 1 .

Fig. 5 shows schematically a detail view of a channel 4 which is formed by the partially structured metal foils 3. In this case, smooth and corrugated metal foils 3 provided with a structure 14 were alternately stacked and then wound or bent in such a way that they correspond to the desired cross section of the honeycomb body to be produced. The channel 4 shown here was provided with a carrier layer 21 , which is usually washcoat. This carrier layer has a strongly jagged surface, so that the contact area between the honeycomb body and the exhaust gas, which is conducive to the conversion of harmful constituents in the exhaust gas, can be further enlarged. The carrier layer 21 is impregnated with a catalyst 22 , which essentially comprises noble metals, such as platinum or the like. In order to prevent the honeycomb body itself from having a high heat capacity and thus hindering the starting behavior of such a honeycomb body just after the cold start of the internal combustion engine, the metal foils are preferably made with a foil thickness of less than 0.03 mm, in particular less than 0.025 mm.

Fig. 6 is a perspective view showing an embodiment of the connecting element 7. The connecting element 7 shown has on its outer side 28 two connecting sections 10 , which serve to connect the connecting element 7 to the housing 2 . An expansion slot 13 is provided between the two connecting sections 10 , which also allows the housing 2 (not shown) to move relative to the metal foils 3 (not shown) or the connecting element 7 in the circumferential direction of the honeycomb body 1 (not shown). The part of the connecting element 7 lying against the housing is delimited by a shoulder 24 . Between the shoulder 24 and the edge 29 shown , the connection area 9 is provided on the inside of the connecting element 7 for fixing the metal foils. In the embodiment shown, the shoulder 24 acts simultaneously as a spiral spring and passivating agent, since an outflow of soldering agent is prevented. The connecting sections 10 can also be made significantly smaller, especially if the connection of the connecting element 7 to the housing 2 is carried out as a spot weld. The connecting element 7 also has a thickness 19 , which is preferably in the range from 0.3 to 1.2 mm, in particular 0.5 to 1 mm.

The present invention relates in particular to the fixing of stacks of metal foils 3 in a housing 2 , which has a non-cylindrical structure. Especially with this configuration of the housing 2 or the honeycomb body 1 , a defined connection of the metal foils 3 to the housing 2 must take place, since otherwise, due to the different thermal expansion behavior of the housing 2 itself or the stack of metal foils 3 itself, a defined, long-lasting connection is not ensured can be. This risk is avoided by the honeycomb body 1 according to the invention, at the same time ensuring inexpensive manufacture, particularly in the context of series production. LIST OF REFERENCES 1 Honeycombs
2 housings
3 metal foil
4 channel
5.1-5.8 cross-sectional area
6.1-6.8 radius of curvature
7 connecting element
8 edge
9 Connection area
10 connecting section
11 axis
12 distance
13 expansion slot
14 structure
15 end
16 extension
17 length
18 expansion
19 thickness
20 film thickness
21 carrier layer
22 catalyst
23 passivation layer
24 paragraph
25 space
26 end face
27 inside
28 outside
29 edge

Claims (12)

1. honeycomb body ( 1 ) comprising a housing ( 2 ) and metal foils ( 3 ) arranged therein, which are at least partially structured and / or arranged such that channels ( 4 ) through which a fluid can flow are formed, the housing ( 2 ) having cross-sectional areas ( 5.1 , 5.2 , 5.3 , 5.4 , 5.5 , 5.6 , 5.7 , 5.8 ) with different radii of curvature ( 6.1 , 6.2 , 6.3 , 6.4 , 6.5 , 6.6 , 6.7 , 6.8 ), characterized in that between the metal foils ( 3 ) and at least one connecting element ( 7 ) is arranged in the housing ( 2 ) in at least one, preferably each, cross-sectional area ( 5.1 , 5.3 , 5.5 , 5.7 ) with a large radius of curvature ( 6.1 , 6.3 , 6.5 , 6.7 ), and the metal foils ( 3 ) are directly connected to the housing ( 2 ) in at least one cross-sectional area ( 5.2 , 5.4 , 5.6 , 5.8 ) with a small radius of curvature ( 6.2 , 6.4 , 6.6 , 6.8 ). 2. honeycomb body ( 1 ) according to claim 1, characterized in that in each case at least one connecting element ( 7 ) in all cross-sectional areas ( 5.1 , 5.3 , 5.5 , 5.7 ) of the housing ( 2 ) with the largest radius of curvature ( 6.1 , 6.3 , 6.5 , 6.7 ) is arranged. 3. honeycomb body ( 1 ) according to claim 1 or 2, characterized in that the cross-sectional area ( 5.1 , 5.3 , 5.5 , 5.7 ) with the large or largest radius of curvature ( 6.1 , 6.3 , 6.5 , 6.7 ) is a flank ( 8 ) , 4. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the at least one connecting element ( 7 ) has at least one connection area ( 9 ) and at least one connection section ( 10 ), wherein in the at least one connection area ( 9 ) a joining connection with the metal foils ( 3 ) and in the at least one connecting section ( 10 ) a connection is made with the housing ( 2 ) and the at least one connecting area ( 9 ) and the at least one connecting section ( 10 ) preferably in the direction of an axis ( 11 ) of the honeycomb body ( 1 ) are spaced apart. 5. honeycomb body ( 1 ) according to claim 4, characterized in that the joining connections comprise a solder connection and / or a welded connection. 6. honeycomb body ( 1 ) according to one of the preceding claims, characterized in that the at least one connecting element ( 7 ) has at least one expansion slot ( 13 ), which preferably outside a connection area ( 9 ) of the connecting element ( 7 ) with the metal foils ( 3 ) is arranged. 7. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the connection area ( 9 ) of the at least one connecting element ( 7 ) by at least one passivation means ( 23 , 24 ) is limited. 8. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the metal foils ( 3 ) are each aligned with at least one of their ends ( 15 ) towards the housing ( 2 ), all of these ends ( 15 ) with the at least one Connecting element ( 7 ) are connected by joining technology. 9. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the housing ( 2 ) has an oval or a polygonal cross section. 10. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the housing ( 2 ) has an extension ( 16 ) and the metal foils ( 3 ) have a length ( 17 ) in the direction of an axis ( 11 ) of the honeycomb body ( 1 ) , wherein the extent ( 16 ) and the length ( 17 ) are carried out in different amounts. 11. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the at least one connecting element ( 7 ) has an extent ( 18 ) in the direction of the axis ( 11 ) which of the extension ( 16 ) of the housing ( 2 ) and / or the length ( 17 ) of the metal foils ( 3 ) is different. 12. honeycomb body ( 1 ) according to any one of the preceding claims, characterized in that the at least one connecting element ( 7 ) has a thickness ( 19 ) of 0.1 mm to 1 mm, in particular from 0.3 mm to 0.7 mm.