JPH05332131A - Catalyst metal carrier and its manufacture - Google Patents

Abstract

PURPOSE:To prevent heat deformation, destruction by thermal stress, and shifting of a plate in a catalyst metal carrier by providing a connecting plate in such a state as penetrating a corrugated plate and a flat plate straight in a direction perpendicular to the honeycomb structure axis and holding brazing filler metal on the connecting plate. CONSTITUTION:A catalyst metal carrier is forwed in a honeycomb structure which is made in such a way as combining a corrugated plate 2 with a flat plate 1, both of which are made of heat resisting metal, and rolling up these plates into a multilayered structure. The honeycomb 3 is stored in an outer cylinder 4. A connecting plate 5 is painted with brazing filler metal on its outside face. This connecting plate 5 is inserted into a hole 6 and a connection hole 7 by piercing these holes straight. The corrugated plate 2 and the togue-shaped part 9 of the flat plate 1 for constituting the connection hole 7 are expanded by the inserted connecting plate 5, and at the same time bent into L-shape to be fastened in contact with the outside face of the connecting plate 5 firmly. This composition is heated by a heating device so that brazing filler metal 8 is melted to connect the connecting plate 5, the corrugated plate 2, and the flat plate 1 together to make the catalyst metal carrier. In this way, destruction and shifting of a plate in a catalyst metal carrier are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal catalyst carrier used for supporting a combustion catalyst or the like, and more particularly to a metal catalyst carrier in which a heat-resistant metal is given a property as a catalyst carrier.

[0002]

2. Description of the Related Art Conventionally, a three-way catalytic converter is interposed in the middle of an exhaust pipe in order to reduce CO, HC, NO _{x and the} like in exhaust gas as a measure against pollution of automobiles. One of them is a metal carrier having a honeycomb structure. This one is 2
Usually made of 0Cr-5Al refractory metal, 0.05m
Combining a corrugated sheet with a foil of m thickness and a flat sheet,
A honeycomb-structured catalyst metal carrier formed by winding these in a multilayer shape as shown in FIG. 2 is brazed at the joint between the corrugated plate and the flat plate in order to maintain its shape and structure, or spot welding is performed. Were joined together.

Not only is the brazing filler metal used in most of the above joining and used in large quantities not only industrially undesirable, since the brazing filler metal itself is expensive and requires a high temperature of 1000 to 1200 ° C., When the Ni contained in the brazing material becomes high in temperature, it diffuses and promotes oxidation to cause corrosion destruction of the catalyst metal carrier in the form of abnormal oxidation, and further reacts with γ-alumina carrying the catalyst to produce its catalytic ability. There was a drawback that reduced.

When spot welding is used, 0.0
It was necessary to carry out extremely precise welding in which a 5 mm-thick foil was pitched at a pitch of about 2 mm, and it was necessary to carry out extremely precise welding, resulting in poor work efficiency and high cost, as well as anxiety in the reliability of welding. Further, since the above-mentioned joining is only by locally joining the corrugated plate and the flat plate which are adjacent to each other in the immediate vicinity, as a whole, the catalyst comes out due to thermal deformation due to high temperature, or the catalyst is detached and carried. There is a defect that the seeds are missing and the catalytic ability is lowered.

[0005]

The problem to be solved by the present invention is to eliminate the above-mentioned drawbacks of the conventional catalyst carrier made of a refractory metal of this kind. More specifically, it is to facilitate the assembling of the catalyst metal carrier having the honeycomb structure in a honeycomb structure formed by combining a corrugated plate made of a heat-resistant metal as a catalyst carrier and a flat plate and winding these in multiple layers. Also, by the brazing material held on a part or all of the coupling plate,
Alternatively, it is necessary to develop a means by which the bonding plate is firmly bonded together with the corrugated plate and the flat plate by the shape memory alloy. Furthermore, it is to prevent the catalyst metal carrier from being thermally deformed, broken due to thermal stress, and displaced from the plate due to the high temperature during use.

[0006]

[Means for Solving the Problems] This object is to combine a corrugated plate made of a heat-resistant metal and a flat plate, and to wind them in multiple layers to form a honeycomb structure, and then to move the honeycomb structure in a direction perpendicular to its axis. The problem can be solved by firmly joining the connecting plate, the corrugated plate and the flat plate to each other by a method such as brazing at a contact portion of the connecting plate by penetrating the corrugated plate and the flat plate in a combed state.

[0007]

The function and structure of the present invention will be described in detail with reference to the following embodiments. The first embodiment is a 20Cr-5Al heat-resistant metal foil having a thickness of 0.05 mm, which is combined with a flat plate 1 having a width of 100 mm and a corrugated plate 2, and is wound in multiple layers as shown in FIG. 3 is formed.

Thereafter, the honeycomb 3 is made of the same steel and has a thickness of 1.
It is housed in a 6 mm outer cylinder 4 and is constrained to have a predetermined shape such as a circle or a racetrack type. The outer cylinder 4 is provided with a slightly large hole 6 so that a coupling plate (thickness: 1.2 mm, width: 10 mm) 5 can be loosely inserted, but the corrugated plate 2 and the flat plate 1 forming the honeycomb 3 are laser-formed. A connecting hole 7 is provided, which is slightly larger in width than the connecting plate 5 and is smaller in the body portion (Fig. 3-A). A brazing material 8 is applied to the outer surface of the connecting plate 5 (FIG. 3-A). The connecting plate 5 is connected to the holes 6 and 7
Insert it into the skewered state. At this time, the corrugated plate 2 forming the coupling hole 7 and the coupling plate 5 into which the tongue-shaped portion 9 of the flat plate 1 is inserted
At the same time, it is spread out by being bent by an L-shape (FIG. 3C) and strongly tightened by contact with the outer surface of the connecting plate 5. When this is heated to 1100 ° C. with a heating device, the wax 8 applied to the joining plate 5 melts and joins the tongue-like portions 9 (FIG. 3-C), and the joining plate 5, the corrugated plate 2 and the flat plate are joined. 1
And become a catalytic metal support. Incidentally, FIG. 3 shows this partially in cross section.

The second embodiment uses a shape memory alloy having good heat resistance for the connecting plate of the first embodiment. The bonding plate 10 is a one-way type shape memory alloy having a melting point of Fe—Mn—Si of 1350 ° C., and the honeycomb core 3 in the state of FIG.
When it is heated to 200 ° C after it is inserted into holes 6 and 7 of Fig.
-By changing to the shape of (b), it becomes a catalyst metal carrier in which the joining plate 10 and the corrugated plate and the flat plate are joined together in cooperation with the tightening of the tongue portion 9.

The third embodiment is a honeycomb core 1 as shown in FIG.
The first end 12 is provided with a notch portion 13, and a brazing plate 14 to which brazing is applied is attached to the notch portion 13 as in the first embodiment. Honeycomb core and tongue, other configurations are first
Same as the embodiment. The groove 15 may not be provided in particular. This is heated to 1100 ° C. with a heating device to melt the brazing filler metal and bond the bonding plate 14 and the cut portion 13 of the end 12 of the honeycomb core 11 to form a catalyst metal carrier.

The fourth embodiment is the connecting plate 14 of the third embodiment.
The shape memory alloy having good heat resistance is used for the.
The configurations of the honeycomb core and the tongue-shaped portion are the same as those in the third embodiment.

As described above, in the present invention, the honeycomb structure is brazed at the joining plate and the contact portion of the skewer, which is a completely new brazing joining method. By this means, not only simple and reliable brazing is possible, but the brazing material to be used may be local and small in amount. For this reason, not only the processing cost is low, but also the shape of the honeycomb structure after bonding can be easily maintained and there is no difficulty as a catalyst metal carrier, and the scoping and the spot welding methods which have been problematic in the conventional brazing method and spot welding method can be used. The slipping out of the board is solved. In addition, for honeycomb structures that are conventionally difficult to braze or spot weld, that is, a structure in which a corrugated plate and a corrugated plate are wound in a crossed manner, a structure in which an expanded metal is used for a flat plate and the corrugated plate is alternately wound, and other structures Can be easily dealt with, and has an effect of drastically reducing the manufacturing cost of the catalyst metal carrier.

The present invention solves the problem of reliably joining the honeycomb core and the outer cylinder or the catalyst container, which has been proposed many times because it has been difficult in the past.

It should be noted that, in the above, 0.05 m of 20Cr-5Al system is used.
Although the heat resistant metal of m thickness, 1.2 mm thickness and 1.6 mm thickness has been described, it is not limited to such as corrugated flat plate, joining plate and outer cylinder, and other thick materials and other materials and combinations thereof. Alternatively, it may be combined with another heat-resistant material. The position and the number of connecting plates are not limited. Further, the processing of the coupling hole and the cut portion is not limited to the laser, and other high energy or a cutting tool, grinding, or other means may be used as long as the same processing can be performed. Further, the shape of the connecting hole, the shape and presence of the tongue portion, the size and shape of the connecting plate, and the application and application method of the brazing material are not limited. For example, a recess may be provided in the longitudinal direction of the connecting plate and the brazing material may be applied therein. The brazing material may be applied to the honeycomb core instead of the bonding plate. Depending on the purpose, only the honeycomb cores may be joined by the joining plate. Further, it is needless to say that the shape memory alloy is not limited to the Fe-Mn-Si type, but Ni-Ti type or other types can be freely applied and the shape to be memorized can be set freely. Further, it is not limited to automobiles and can be used as other catalyst carriers.

[0015]

[Brief description of drawings]

FIG. 1 shows a structural example of a corrugated plate and a flat plate that constitute a catalyst carrier.

FIG. 2 is an explanatory view showing a part of an outer cylinder extracted to explain a catalyst carrier.

FIG. 3 is an explanatory view showing, in a partial cross section, a mode of coupling between the coupling plate and the coupling hole.

FIG. 4 is an explanatory view showing before and after heating the shape memory alloy.

FIG. 5 is an explanatory view showing a part of the catalyst carrier extracted.

[0016]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plate 2 Corrugated plate 3 Honeycomb core 4 Outer cylinder 5 Bonding plate 6 Hole 7 Bonding hole 8 Wax 9 Tongue-shaped part 10 Shape memory alloy 11 Honeycomb 12 Edge part 13 Notch part 14 Bonding plate 15 Groove

Claims (6)

[Claims] 1. In a catalyst metal carrier having a honeycomb structure formed by combining a corrugated plate made of a heat-resistant metal and a flat plate and winding these in multiple layers, a coupling plate is formed in the direction perpendicular to the axis of the honeycomb structure with the corrugated plate. The flat plate is provided in a state of being pierced in a combed state, and the joint plate holds a brazing filler metal on one part or all of the joint plate so that the joint plate, the corrugated plate and the flat plate are coupled by this brazing filler metal. A catalyst metal carrier characterized by being made. 2. The bonding plate is made of a heat-resistant shape memory alloy, and the recovery of the memory of the shape memory alloy causes the bonding plate, the corrugated plate, and the flat plate to be bonded together. Metal catalyst carrier. 3. The honeycomb-shaped corrugated plate and the flat plate are cut at their ends, and a joining plate is fitted therein, and the brazing material held by the joining plate joins the joining plate, the corrugated plate and the flat plate at the cut portion. A catalyst metal carrier, characterized in that 4. The bonding plate is made of a heat-resistant shape memory alloy, and the memory alloy is recovered by the recovery of the memory,
A catalyst metal carrier, wherein the corrugated plate and the flat plate are joined together at the cut portion. 5. A combination of a corrugated plate made of a heat-resistant metal and a flat plate, which are wound in multiple layers to form a honeycomb structure, and a connecting plate having a size slightly larger than a hole perforated therein is penetrated. The method for producing the catalyst metal carrier according to claim 1 or 2. 6. A combination of a heat-resistant metal corrugated plate and a flat plate, which are wound in multiple layers to form a honeycomb structure, and an end portion of the honeycomb structure is cut and a joining plate slightly thicker than a cut width is fitted. The method for producing the catalyst metal carrier according to claim 3 or 4.