JPH05202744A - Manufacture of honeycomb body for carrying exhaust gas purifying castalyst - Google Patents

Abstract

PURPOSE:To improve heat resistant oxidizing property and reduce the production cost by manufacturing a honeycomb body which is made of thin metallic plates and have mesh hole passages, forming an alminum film on the brazing portion of the honeycomb body and heating the brazing portion after coating the alminum film with brazing agent. CONSTITUTION:In manufacturing, first of all, a honeycomb body H having many mesh air hole passages 3 in the axial direction is made of a single wave- like strap material 2 made of a thin wall metallic plate or by folding and piling wave-like strap materials 2 and flat plate like strap materials 1. At this time, the honeycomb body H is contained in a metallic casing 4. In the next step, an alminum film 5 is formed on a portion of the honeycomb body H including brazing section. In the next step, brazing is coated on the portions at which wave plate-like strap materials 2 abut on each other and the brazing section 6 comprising sections the wave plate-like strap materials 2 and flat plate-like material 1 abutting on each other. The honeycomb body H is heated in vacuum or under the atmosphere of non-oxidizing gas to braze the brazing section 6 and make alminum in the strap materials 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally serves as a means for purifying exhaust gas of automobiles, and has an exhaust gas purifying device installed in the middle of an exhaust system, and in particular for carrying an exhaust gas purifying catalyst which is a main component thereof. The present invention relates to a method for manufacturing a metal honeycomb body. More specifically, the present invention has a major drawback of this type of honeycomb body, and in particular, has low thermal oxidation resistance derived from the thin metal plate strips (flat strips and corrugated strips) forming the honeycomb. An object of the present invention is to provide a method for manufacturing an exhaust gas purifying apparatus that is economical and inexpensive while solving the drawbacks.

[0002]

2. Description of the Related Art Conventionally, a metal carrier matrix for supporting an exhaust gas purifying catalyst of this type (for example, a catalyst using Pt, Rh, Pd, etc.) has a large catalyst supporting area per unit volume. (The effective contact area between the exhaust gas and the purification catalyst per unit volume should be as large as possible), the back pressure (exhaust resistance) should be small, and the weight of the metal carrier should be as light as possible. Considering things to do, etc.,
A heat-resistant, thin metal plate-shaped flat plate material and a corrugated plate material are stacked so as to be in contact with each other and wound to form a honeycomb structure (hereinafter referred to as a honeycomb The body is well known. A laminated type, a wound type, an S-shaped type, a radial type, an X type, depending on the difference in the method of forming the honeycomb body from the flat band material and the corrugated plate material.
Various types such as a wrap type can be obtained.

The above-mentioned metal honeycomb body is, for example,
A flat plate-shaped strip made of a heat-resistant thin-walled steel plate having a thickness of 0.1 mm or less (preferably 50 μm or less) and a corrugated plate-shaped strip formed by corrugating the thin-walled steel plate have contact portions with each other. The cells are piled up and wound together in a spiral shape to form a honeycomb body having a large number of mesh-like vent holes for the exhaust gas passage in the axial direction. The wound and laminated honeycomb bodies are housed in a cylindrical metal case having openings at both ends and are connected to each other to form a vibration-proof structure. That is, the contact portion between the flat plate-shaped strip material and the corrugated plate-shaped strip material forming the honeycomb body or the contact portion between the honeycomb body and the metal case is fixed by a desired fixing means such as welding or brazing. Exhaust gas purification device

As is well known, this type of exhaust gas purifying apparatus is used under severe environmental conditions of an exhaust gas system, and therefore the metal honeycomb body, which is a main component thereof, has high temperature corrosion resistance. (Gas corrosion resistance, corrosion resistance in exhaust gas system around 1000 ° C.), cold heat resistance (durability under heating / cooling cycle of 1000 ° C. to room temperature in cycle of stopping and starting internal combustion engine), high temperature resistance It is preferably made of heat-resistant steel having excellent physical properties such as oxidative property (durability against abnormal oxidation at high temperature). As a heat-resistant steel material for a metal honeycomb body, for example, one obtained by rolling Fe-Cr-Al-based (20Cr-5Al-based) heat-resistant steel into a foil having a thickness of several tens of μ is known. The foil material described above is used as follows. That is, a honeycomb body is manufactured from a corrugated sheet foil and a flat sheet foil that are corrugated as described above, and a whisker-shaped α-Al ₂ O is formed on the foil surface by high temperature oxidation treatment.
₃ film is formed, and then γ-on the α-Al ₂ O ₃ film layer.
Al ₂ O ₃ is adhered by washcoat treatment, and an exhaust gas purifying catalyst such as Pt is carried on this. It is said that the above-mentioned α-Al ₂ O ₃ coating layer is excellent in high temperature oxidation resistance or adhesion of the washcoat layer, but it is still insufficient. In addition, the above-mentioned Fe-C
The r-Al heat resistant steel or the heat resistant steel obtained by adding a small amount of a rare earth element component (REM) to the heat resistant steel in order to further improve the oxidation resistance is inferior in rollability (workability).

Considering the effectiveness of a heat-resistant steel having a α-Al ₂ O ₃ coating on its surface as a heat-resistant steel used for manufacturing a metal honeycomb body, many Al-enriching techniques for a base metal have been proposed. For example, 1. A is formed on the surface of a metal substrate for a catalyst carrier containing Fe as a main component
A thin layer of 1 l is formed and heat-treated in an oxidizing atmosphere such as air to cover the surface of the substrate with a dense aluminum oxide film to improve heat resistance, oxidation resistance and corrosion resistance (JP-A-49-99982).
issue). 2. In the metal composition, Al 12 to 20%, Cr 5
~ 25%, Ti, Nb, Zr, Hf (total) 0.05
A rolled metal foil having a high Al content of ˜2% and the balance being Fe is used (JP-A-63-266044). 3. A 1.0 to 5.0% Al and 0.5% or less Ti
Al plating is applied to the surface of l-Ti-containing stainless steel,
A method in which Al ₂ O ₃ whiskers are formed in an Al plating layer by heat treatment (JP-A-63-270548). 4. After plating the surface of ferritic stainless steel with Al, heat it in a vacuum or in an atmosphere of a non-oxidizing gas to diffuse Al and form a ferrite layer with a high Al content on the surface, and then heat it in air to oxidize whiskers. What is produced (Japanese Patent Laid-Open No. 1-142073). 5. At least one of alkali metal, alkaline earth metal and lanthanoid on ferritic stainless steel (base material)
An Al alloy layer containing a seed is formed, and an Al ₂ O ₃ film is formed on the surface of the Al alloy layer (Japanese Patent Laid-Open No. 63-310638). 6. The surface of stainless steel flat plate foil and corrugated sheet foil is covered with an aluminum material, and this is heat-treated (several tens of hours to several minutes) in the air at 470 to 1100 ° C.
to form a Fe-Al intermetallic compound containing e ₃ Al preparing basic materials are. Next, a honeycomb body is manufactured from the basic material, and brazing is performed with a high-temperature brazing material (Ni-based brazing material, 1100 ° C. for 10 minutes in vacuum) (JP-A-62-95142).
issue). 7. After the corrugated plate and the flat plate of the ferritic stainless steel material containing Al are wound and formed in multiple layers, the corrugated plate and the flat plate are brazed or welded, and then, before the growth heat treatment of the whiskers for growing the alumina whiskers on the material surface, A pretreatment (atmosphere in air, 200 to 400 ° C., 2 to 20 minutes) for forming a precursor of alumina is performed (JP-A-63-7838). 8. As a pre-process for forming a material formed of an Al-containing ferritic alloy into a flat plate and a corrugated plate, the material is anodized, and then the flat plate and the corrugated plate are wound in multiple layers to form a honeycomb body. The corrugated sheet is brazed or welded (JP-A-63-158135). However, the process for manufacturing the material itself (the basic material itself) having a high Al content is complicated, and there is a problem in the workability (rollability) of the manufactured material. Is not sufficiently satisfactory because the process for manufacturing the metal honeycomb body is complicated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art. In particular, in the present invention, in manufacturing a honeycomb body, brazing of the constituent members of the honeycomb body (corrugated strip material or corrugated strip material and flat strip material) with a high temperature brazing material such as Ni-based brazing material In a honeycomb body manufacturing process in which steps are essentially incorporated, an Al enriching means is efficiently incorporated to manufacture a honeycomb body having excellent characteristics.

In this respect, the prior art is an Al enrichment technique which does not consider the severe conditions of the high temperature brazing process, for example, the severe brazing process of 1100 ° C. or more for several hours in vacuum. This is an inadequate technique for manufacturing a honeycomb body that incorporates a brazing process under certain conditions. That is, A applied to the flat strip material or corrugated strip material forming the honeycomb body (in other words, at the material stage)
It is extremely doubtful when considering whether the l-enrichment means can achieve the original purpose even through such a severe brazing process. This means that, for example, in the brazing process performed under the above-mentioned severe conditions, the base material is used for the α-Al ₂ O ₃ layer (active alumina layer) formed on the surface at the stage of the band material. F inside
It is also clear from the viewpoint that e, Cr, or the Ni component in the brazing material diffuses and permeates to form a complex oxide such as spinel, which reduces the surface area.
In view of the importance of the aluminum enriching means in the honeycomb body manufacturing process in which the high temperature brazing step is an essential step, the present invention is an efficient honeycomb incorporating the Al enriching means so as not to have the above-mentioned drawbacks. It is intended to provide a manufacturing process for the body.

[0008]

The present invention will be summarized as follows.
The present invention provides a method for manufacturing a metal honeycomb body for supporting an exhaust gas purifying catalyst, comprising: (i) a corrugated strip made of a thin metal plate, or the corrugated strip and a flat strip. In the step of manufacturing a honeycomb body having a large number of mesh-like vent holes in the axial direction by folding or stacking so as to abut each other, (ii) aluminum in a portion including a desired brazing portion of the honeycomb body A step of forming a film, (ii
i) a step of coating a brazing material on a brazing part composed of the contact portions between the corrugated strip materials or the contact portions between the corrugated strip material and the flat strip materials of the honeycomb body, (iv) A step of heating the honeycomb body in a vacuum or in a non-oxidizing gas atmosphere to braze the brazed portion and diffusing aluminum into the strip material; The present invention relates to a method for manufacturing a honeycomb body for supporting an exhaust gas purification catalyst. Furthermore, the present invention is excellent in heat-resistant oxidation resistance obtained by combining (v) alumina whiskers with a heat treatment step in an oxidizing atmosphere for growing and growing (v) alumina whiskers in the steps (i) to (iv). The present invention relates to a method for manufacturing a honeycomb body for supporting an exhaust gas purification catalyst. Hereinafter, technical configurations and embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the illustrated one.

FIG. 1 is a perspective view of a honeycomb body (H) manufactured by the manufacturing process (i) of the present invention. In the present invention, the honeycomb body (H) is packed and fixed in the metal casing (4) as required as shown in the drawing. It goes without saying that the fixing to the casing (4) described above is performed during the brazing process described later.

The honeycomb body (H) manufactured in the step (i) may be manufactured by a known method. In the structure shown in FIG. 1, a flat metal strip (1) and a corrugated metal strip (2) made of a thin metal plate are stacked so as to be in contact with each other, and are wound in a spiral shape at once. It is a rotating type honeycomb body (H). When the two strips (1, 2) are roll-formed, a large number of mesh-like ventilation passages (3) for exhaust gas parallel to the axial direction of the honeycomb body (H) are automatically formed.

In the present invention, as the strip material (1, 2) as the starting base material forming the honeycomb body (H), the aluminum enrichment of the strip material (1, 2) is performed in the step described later. It is possible to use a low Al-containing material instead of the conventional high Al-containing material that has a problem in workability, or a heat-resistant steel material that does not contain Al and has good workability. Of course,
It goes without saying that the starting base material may be Al-enriched by some method. For example, as this kind of strip material (1, 2), an inexpensive low-carbon steel containing 0.15% or less of carbon that can be easily rolled and can be processed into a foil having a desired thickness, or a low-chrome steel. (1
Heat-resistant steel of 5 to 25% Cr, low-chromium steel such as SUS410L of 11 to 13.5% Cr), heat-resistant steel of low nickel, and stainless steel are used. Of course, the Fe-Cr-Al system and the Fe-Cr- system mentioned in the section of the description of the prior art are used.
It goes without saying that an Al-REM steel material may be used.

The honeycomb body (H) manufactured in the step (i) of the present invention is not limited to the wound type honeycomb body as shown in FIG. That is, a flat type strip material (1) and a corrugated strip material (2) are stacked on each other so as to be in contact with each other, and the spirally wound honeycomb body (H It is needless to say that the honeycomb body (H) having another shape well known in the art may be used. For example, the honeycomb body (H) of various types as shown below can be used. (i) Hierarchical type honeycomb body (H) manufactured by stacking (stacking) flat strips (1) and corrugated strips (2) made of thin metal plates so as to abut each other ) Can be. (ii) A flat metal strip (1) and a corrugated metal strip (2) made of a thin metal plate are brought into contact with each other to form a purification element, and a desired number of the purification element is fixed to a fixed shaft (central axis). ) Is used as a starting point to extend (irradiate) to produce a radial type honeycomb body (H). (iii) A flat band (1) made of a thin metal plate and a corrugated band (2) are brought into contact with each other to form a purification element, and the outermost surface of the purification element is a flat band (1). ) Is stacked in a desired number of stages in a layered manner, and two fixing points set on the upper and lower outermost surfaces thereof are press-formed in opposite directions so that each purification element has an S-shaped shape. It can be an S-shaped type honeycomb body (H). (iv) A corrugated strip (2) made of a thin metal plate is singly used, or the flat strip (1) and the corrugated strip (2) are folded or laminated (stacked) to form a desired adjacent phase. And at least two (preferably four or more) of the purification elements are held by a holding tool so that one ends of the respective purification elements are adjacent to each other, and the holding tools are provided. It can be a honeycomb body (H) manufactured by winding in the same direction with respect to. This type of honeycomb body is commonly called an X-wrap type honeycomb body (H) because the purification elements are overlapped in a cross shape, an X shape, and a swollen shape at the central portion (overlap). In addition, the cross-sectional shape of the entire honeycomb body (H) of this type when viewed from the front is a substantially circular shape, a substantially square shape, or a substantially elliptical shape due to the shape of the side surface of each purification element being a rectangle, a trapezoid, or a parallelogram. .. In addition, the above-mentioned wound type and hierarchical type honeycomb body (H)
It goes without saying that the cross-sectional shape viewed from the front is not limited to a substantially circular shape, and may be an oval shape, a race track shape, or any other desired shape.

In the method for manufacturing the honeycomb body (H) of the present invention, a characteristic point is that after the manufacturing step (i), that is, the flat strip and the corrugated strip (of course, the latter alone may also be used. It does not matter which is that the step (i) of manufacturing the honeycomb body, the step (ii) of forming the aluminum coating, and the step (iii) of applying the brazing filler metal are combined in this order. .. The bonding relationship between the steps (ii) and (iii) described above is that the Al enrichment for improving the thermal oxidation resistance of the strips (1, 2) constituting the honeycomb body (H) is 2)
It is based on the finding that the brazing condition of the contact portion can be taken into account and effectively implemented. That is, the honeycomb body (H) of this type has (iii) after the step (i)
Depending on the process, high-temperature brazing material such as Ni-based brazing material is applied to the abutting part (all or part) of the strips (1, 2), brazing is performed under severe conditions, and mechanically and earthquake-resistant. Is also made to be strong. Generally, the conditions for brazing using a high temperature brazing material are severe conditions such as in vacuum (for example, 10 ⁻⁴ Torr or less), 1100 ° C. or higher, and the total time required for brazing (several hours).

Therefore, by incorporating such high-temperature brazing conditions into Al enrichment, Al can be diffused in the strips (1, 2) and at the same time, α-alumina in the subsequent step is grown. Of the activated alumina layer (α
-Alumina layer) can be formed. That is, the Al component applied to the surface of the strip (1, 2) is
2) The active alumina layer formed on the surface of the base material /
It is firmly bonded to the Al diffusion layer. The significance of this is important, and the exhaust gas purifying catalyst is carried on the activated alumina layer subsequent to the wash coat (γ-alumina coating). )
Since it has a strong bonding strength on its surface, it can exhibit catalytic activity over a long period of time. Further, when the Al component diffuses and permeates into the base material, it can function as a brazing material at the contact portion of the strips (1, 2).

The structure of the honeycomb body (H) of the present invention manufactured by the above processes ((i) to (iii)) will be described with reference to FIG. FIG. 2 is a partially enlarged cross-sectional view of the honeycomb structure of the honeycomb body (H) shown in FIG. The aluminum coating layer (5) is formed on the outer surfaces of the strips (1, 2) by the aluminum coating forming step of the step (ii) of the present invention. Then, the brazing filler metal portion (6) is formed by the coating process of the high temperature brazing filler metal in the step (iii).

In the present invention, as the method of forming the aluminum coating film in the step (ii), a vapor deposition method using a molten aluminum bath, an electroplating method, a hot dipping method, a coating method of a coating solution of aluminum powder, or the like is adopted. The thickness of the aluminum coating layer (5) to be formed may be set appropriately depending on the desired degree of thermal oxidation resistance. For example, evaporation method, electroplating method,
A few μ to a hundred μ by using the hot dip method, specifically 5 μ to
The film coating layer (5) having a thickness of about 10 μ may be formed.

In the present invention, various methods can be adopted as the method of coating the high temperature brazing material in the step (iii).
For example, the brazing filler metal slurry is concentrated and formed in the vicinity of the contact portion of the strips (1, 2) as shown in the figure due to the surface tension relationship. The excess brazing material slurry may be removed by air blow or the like. In addition, the formation of the brazing material portion (6)
It may be performed by electric or electroless nickel plating, brazing material powder spray coating, or the like, and the forming means is not limited. For example, U.S. Pat. No. 4,381,590, JP-A-56-4373 or JP-A-61.
Various methods described in, for example, Japanese Patent Publication No. 199574 can be adopted. In addition, the forming portion of the brazing material portion (6) is
Rather than brazing all the abutting portions of the strips (1, 2) in consideration of the thermal deformation resistance of the honeycomb body (H) (deformation by thermal expansion and thermal stress), for example, one end face and its There is a mode in which the vicinity part, or the abutting part between the two end faces and the vicinity part thereof, or the outer peripheral part and the vicinity part thereof in the radial direction of the honeycomb body (H) are joined, and the brazing material part ( 6) may be formed. Of course, it is needless to say that the aluminum coating layer (5) is preferably formed in the region including the brazing material portion (6).

After the steps (i) to (iii) are completed in the above manner, the brazing is performed by the high temperature brazing material in the step (iv), and Al is applied to the band material (1, 2) substrate. Diffusion and penetration treatment is performed. The conditions for joining with high temperature brazing filler metal are
Generally under vacuum (eg 10 ^-4 Torr or less), 1100-1
It may be performed under the condition of 200 ° C. It should be noted that it is sufficient that the treatment time is on the order of several hours including the heating and cooling times. Al diffuses and permeates into the base material of the strip material (1, 2), and can also function as a brazing material at the contact portion of the strip material (1, 2). After the step (iv), alumina whiskers (α-Al
_It suffices to perform a process for producing and growing ₂ O ₃ ). For example, as the step (v), heat treatment (400 to 1100 ° C.) may be performed in an oxidizing atmosphere such as the air. Also,
After the step (v), the activated alumina layer (α-Al formed and grown on the surface of the base material of the strips (1, 2) is grown according to a conventional method.
₂ O ₃ ) with wash coat (γ-Al with large surface area)
₂ O ₃ coating), and further Pt,
A redox catalyst such as Pd or Rh may be supported.

FIG. 3 is a honeycomb body (H) manufactured according to the steps (i) to (v) of the present invention and further carrying a catalyst.
FIG. 3 is a schematic view showing a cross section of a portion A in FIG. As shown in FIG. 3, the base material / Al diffusion layer (1 ′) was formed on the base material of the strip (1), and the activated alumina layer (5 ′) (the aluminum coating layer was formed thereon). α
-Alumina layer), and the catalyst carrying layer (7) is further firmly bonded thereto. The catalyst supporting layer (7) is formed by washcoating the activated alumina layer (5 ') and supporting an exhaust gas purifying catalyst such as Pt as described above.

In the present invention, the metal case (4) is
This is for accommodating and fixing the above-mentioned various types of honeycomb bodies (H) inside, and if the both ends are open, there is no restriction on the material and shape thereof. At this time, in order to fit into the space under the vehicle body, a shape such as an elliptical cross section or a substantially triangular cross section may be used although it is related to the cross sectional shape of the honeycomb body (H). As the material of the metal case, the same kind of material as the flat band material (1) and the corrugated plate material (2) may be used, or a material having high heat and corrosion resistance may be used. Alternatively,
It is also possible to use a dual structure in which the metal material of the outer portion is richer in heat resistance and corrosion resistance than the inner portion, specifically, ferritic stainless steel is used for the inner portion and austenitic stainless steel is used for the outer portion.

[0021]

The honeycomb body, which is a main component of the exhaust gas purifying apparatus of the present invention, is used severely in a high temperature environment called an exhaust gas system and further under an exothermic catalytic reaction between exhaust gas and an exhaust gas purifying catalyst. It has excellent durability (longer life cycle) under the environment. In particular, on the outer surface of the corrugated strip material or the corrugated strip material and the flat strip material which are the constituent members of the honeycomb body, a diffusion and permeation layer of the strip material base material and Al, and further on the diffusion and permeation layer Since the activated alumina layer is firmly formed on the above, it has excellent thermal oxidation resistance.

Further, in the method for manufacturing a honeycomb body of the present invention, the formation of the diffusion permeation layer of the band material base material and Al and the activated alumina layer is performed by a brazing step of a high temperature brazing material of the honeycomb body. In the complicated conventional manufacturing process,
It can be efficiently performed by incorporating an Al enrichment step and an α-alumina generation and growth step before and after the brazing step. Further, in the method for manufacturing a honeycomb body of the present invention, since Al enriching means is taken in the subsequent step as a constituent member of the honeycomb body, workability (spreadability, corrugation processing, winding molding, etc.) Since it is possible to use an excellent and inexpensive basic material and the Al enrichment is performed in the state of the honeycomb structure, the Al enrichment facility is compact. Further, in the present invention, the Al coating layer formed on the strip material base material by the Al enrichment step can exert a function as a brazing material at the contact portion of the strip material, so that it is firmly brazed and joined. A honeycomb body can be obtained, and an expensive high temperature brazing material such as Ni can be saved accordingly. From the above, the method for manufacturing a honeycomb body having excellent thermal oxidation resistance of the present invention is far superior to the conventional method.

[Brief description of drawings]

FIG. 1 is a perspective view of a honeycomb body (H) of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a honeycomb body (H) for explaining a formation state of an aluminum coating layer and a brazing material portion of the present invention.

FIG. 3 is an enlarged cross-sectional view of a band member constituting the honeycomb body (H) when the catalyst supporting layer of the honeycomb body (H) of the present invention is provided.

[Explanation of symbols]

 H ……… Honeycomb body 1 ………… Flat strip material 2 ………… Corrugated strip material 3 ………… Reticulated vent holes 4 ………… Metal casing 5 ………… Al coating layer 6 ………… Brazing material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B23K 31/02 310 B 9154-4E C23C 2/12

Claims (13)

[Claims] 1. A method for manufacturing a metal honeycomb body for supporting an exhaust gas purifying catalyst, comprising: (i) a corrugated strip made of a thin metal plate alone or the corrugated strip and a flat strip. A step of manufacturing a honeycomb body having a large number of mesh-like ventilation passages in the axial direction by folding or stacking the materials so as to abut each other, and (ii) aluminum in a portion including a desired brazing portion of the honeycomb body A step of forming a coating film, (iii) coating a brazing material on a brazing portion formed of a contact portion between the corrugated strip materials or a contact portion between the corrugated strip material and the flat strip material of the honeycomb body. And (iv) heating the honeycomb body in a vacuum or in a non-oxidizing gas atmosphere to braze the brazed portions and diffuse aluminum into the strip material. Exhaust gas purification with excellent thermal oxidation resistance Process for production of a supported for honeycomb bodies of medium. 2. The steps (i) to (iv) according to claim 1 are combined with (v) a step of heat-treating the honeycomb body in an oxidizing atmosphere. A method for manufacturing a honeycomb body for supporting an exhaust gas purifying catalyst having excellent heat resistance and oxidation resistance. 3. The method for manufacturing a honeycomb body according to claim 1, wherein the portion where the aluminum coating is formed coincides with the portion where the brazing material is coated. 4. The method for manufacturing a honeycomb body according to claim 1, wherein the portion where the aluminum coating film is formed is the entire portion of the honeycomb body. 5. The method for forming an aluminum film is a hot dipping method using a hot aluminum bath, an electroplating method, a vapor deposition method, or a coating method.
Alternatively, the manufacturing method of the honeycomb body according to the item 2. 6. The method for manufacturing a honeycomb body according to claim 1, wherein the brazing material is a Ni-based high temperature brazing material. 7. The method for manufacturing a honeycomb body according to claim 1, wherein the brazing is performed in vacuum at a temperature of 1100 ° C. or higher. 8. The heating condition under an oxidizing atmosphere is 400
The method for manufacturing a honeycomb body according to claim 2, wherein the temperature is ˜1100 ° C. 4. 9. The honeycomb type is a wound type manufactured by stacking a flat band member and a corrugated plate member so that they are in contact with each other, and winding and stacking them in a spiral shape. 1 or 2
A method for manufacturing a honeycomb body according to the item 1. 10. The honeycomb body according to claim 1 or 2, wherein the honeycomb body is of a layer type manufactured by laminating flat plate-shaped strips and corrugated plate-shaped strips in a layered manner so as to be in contact with each other. Manufacturing method. 11. A honeycomb body is produced by bringing a flat band material and a corrugated strip material into contact with each other to form a purification element, and extending a desired number of the purification elements outward from a fixed shaft as a starting point. The method for manufacturing a honeycomb body according to claim 1, which is of a radial type. 12. The honeycomb body forms a purification element by bringing a flat strip material and a corrugated strip material into contact with each other, and the purification element has a desired number of stages so that the outermost surface is a flat strip material. 2. An S-shaped type in which each purification element manufactured by press-molding two fixed points set in upper and lower outermost layers in a reverse direction by stacking them in a layered manner is an S-shaped type. Alternatively, the manufacturing method of the honeycomb body according to the item 2. 13. A honeycomb body is a purification element having a desired layer adjacent to each other, which is formed by folding or stacking a corrugated strip alone or a corrugated strip and a flat strip. An X-wrap type that is manufactured by holding at least two of the purification elements with a holder so that one ends of the respective purification elements are adjacent to each other and winding the same in the same direction around the holder. The method for manufacturing a honeycomb body according to claim 1 or 2, wherein