HK1084716B

HK1084716B - A holding and sealing mat material

Info

Publication number: HK1084716B
Application number: HK06104768.6A
Authority: HK
Inventors: 福岛浩司
Original assignee: 揖斐电株式会社
Priority date: 2000-03-22
Filing date: 2006-04-21
Publication date: 2009-01-23

Description

Supporting sealing gasket

The present invention is a divisional application having an application number of 01806905.3, application date 3/21/2001, and an invention title "catalyst converter and diesel particulate filter system".

Technical Field

The present invention relates to an exhaust gas purifying apparatus, and more particularly, to a support mat member for supporting a catalyst carrier in a catalyst converter and a support mat member for supporting a diesel particulate filter in a diesel particulate filter system.

Background

In an exhaust system of an automobile engine, an exhaust gas purifying apparatus is installed in order to purify exhaust gas components. As the exhaust gas purifying apparatus, there are a catalytic converter, a diesel particulate filter (hereinafter, may be referred to as a DP filter) system, and the like.

The catalytic converter purifies exhaust gas components (hydrocarbons, carbon monoxide, nitrogen oxides, etc.) discharged from a gasoline engine or a diesel engine. The catalyst converter is composed of a ceramic catalyst carrier on which a catalyst for purifying exhaust gas components is supported and a metal shell accommodating the carrier. A support gasket for supporting the catalyst carrier is interposed between the catalyst carrier and the metal shell. The catalyst carrier is housed in the metal case in a state in which the support packing is wound. Since the thermal expansion coefficients of the metal shell and the ceramic catalyst support are different, a difference in thermal expansion coefficient occurs at high temperature. Therefore, it is desired to develop a support gasket having a cushioning property capable of absorbing a thermal expansion difference.

In addition, the DP filter system is a device that captures diesel particulates discharged from a diesel engine to purify exhaust gas. The DP filter system is composed of a ceramic DP filter that traps diesel particulates and a metal shell that houses the filter. A support gasket is provided between the DP filter and the metal case to support the DP filter. The DP filter is housed in a metal case in a state in which a support packing is wound. Since the metal shell and the ceramic DP filter have different thermal expansion coefficients, a difference in thermal expansion coefficient occurs at high temperature. Therefore, as in the case of the catalytic converter, it is desired to develop a support mat member having a cushioning property capable of absorbing a difference in thermal expansion.

Here, the support mat of the catalyst carrier and the support mat of the DP filter both have a cushioning property and a large volume. Therefore, when the gasket is incorporated into the metal case, the workability of attaching the gasket is not good.

In view of the above conventional problems, the present invention provides a catalyst converter comprising a support mat for supporting a catalyst carrier, which facilitates handling and has excellent cushioning properties when the catalyst carrier is loaded into a metal casing, and a diesel particulate filter system comprising the support mat, which facilitates handling and has excellent cushioning properties when a DP filter is loaded into a metal casing.

Disclosure of Invention

According to a first aspect of the present invention, there is provided a catalyst converter comprising a catalyst carrier, a metal shell covering the outside of the catalyst carrier, and a support packing disposed between the catalyst carrier and the metal shell.

Characterized in that the supporting and sealing gasket material is composed of 50-3000 pieces/100 cm²Inorganic fiber mat with needle punched density.

And the content of the organic component is more than 0 and less than or equal to 2 weight percent, and the filling density is 0.15-0.45 g/cm³When heated at 300-1000 ℃, a surface pressure of 5-500 kPa is generated.

According to the first aspect of the present invention, the content of the organic component in the supporting sealing material is greater than 0 and less than or equal to 2% by weight. The organic component functions as a binder for supporting the gasket, and suppresses scattering of fibers in the supporting gasket. In addition, the bulkiness of the supporting sealing material can be suppressed to some extent. Therefore, the mounting property of the support mat member when the catalyst carrier is mounted in the metal shell is improved.

On the other hand, if it exceeds 2 wt%, a baking process for completely baking the organic component is required after the support mat is accommodated in the metal shell in order to reduce the amount of the exhaust gas component. As a result, the manufacturing process becomes complicated.

When the content of the organic component in the support packing material is 0, that is, when the organic component is not contained, the fibers are scattered from the support packing material. Therefore, the operation of mounting the catalyst carrier into the metal shell is hindered.

Since the needle punching treatment is performed in the inorganic fiber mat, entanglement between fibers becomes large and a rigidity force is large. Therefore, the support force for supporting the gasket is large. In addition, the volume of the supporting gasket is reduced, and the mountability of the catalyst carrier in the metal shell is improved.

As described above, according to the first aspect of the present invention, it is possible to provide a catalyst converter using a support mat member for supporting a catalyst carrier, which contributes to the operation of mounting the catalyst carrier in a metal shell and has excellent cushioning properties.

According to a second aspect of the present invention, there is provided a diesel particulate filter system comprising a diesel particulate filter, a metal casing covering the exterior of the diesel particulate filter, and a support sealing material disposed between the diesel particulate filter and the metal casing.

Characterized in that the density of the supporting sealing gasket material is 50-3000 pieces/100 cm²An inorganic fiber mat subjected to needle punching.

And the content of the organic component is more than 0 and less than or equal to 2 weight percent, and the filling density is 0.15-0.55 g/cm³When heated at 300-500 ℃, a surface pressure of 5-1000 kPa is generated.

According to the second aspect of the present invention, the content of the organic component in the support gasket material is greater than 0 and less than or equal to 2% by weight. The organic component functions as a binder for supporting the sealing material, and suppresses the volume of the supporting gasket to some extent. Therefore, the mounting property of the support gasket when the DP filter is mounted in the metal case can be improved.

In addition, the organic component having the above-mentioned specific content can prevent the fibers in the support packing from scattering.

When the content of the organic component in the support packing is 0, that is, when the organic component is not contained, the fibers are scattered from the support packing, and the working environment when the DP filter is mounted in the metal case is deteriorated.

Since the inorganic fiber mat is subjected to the needle punching treatment, the fibers are entangled with each other to increase the rigidity. Therefore, the force of the DP filter is supported by the gasket. In addition, the volume of the supporting gasket is reduced, and the mountability of the catalyst carrier in the metal shell is improved.

As described above, according to the second aspect of the present invention, it is possible to provide a diesel particulate filtering system including a support packing material which is easy to handle when a DP filter is mounted in a metal casing and has excellent cushioning properties.

Brief description of the drawings

Figure 1 is a cross-sectional view of a catalytic converter of embodiment side 1,

FIG. 2 is an explanatory view illustrating the installation positions of the catalyst converter of example 1 and the DP filtering system of example 4,

FIG. 3 is an explanatory view of the needle-punching apparatus of example 1,

FIG. 4 is an explanatory view (a) to (c) showing a method for producing a catalytic converter of example 1,

fig. 5 is a cross-sectional view of the catalytic converter of example 4.

Detailed description of the invention

According to the first aspect of the present invention, the content of the organic component in the above-mentioned support gasket material is preferably more than 0 and 1 wt% or less. When the amount exceeds 1 wt%, a firing process for firing the organic components may be required after the supporting sealing material is mounted in the metal case in order to achieve a predetermined exhaust emission standard.

The organic component contained in the support gasket is not particularly limited as long as it functions as a binder, and may, for example, be latex.

When the inorganic fiber mat contains an organic component, a dipping method, a spraying method, a roll coating method, or the like can be used.

The support gasket is preferably made of an inorganic fiber containing at least alumina or silica, and thus can improve heat resistance.

The support gasket preferably contains alumina in an amount of 70 wt% or more. This improves heat resistance. In addition, the elastic force at high temperature is increased, so that the thermal expansion difference between the metal shell and the catalyst carrier can be absorbed, and the force for supporting the catalyst carrier can be increased. Therefore, the shaking of the catalyst carrier can be prevented, and the increase of the vibration noise can be suppressed. Moreover, the properties of the composition can be sufficiently exhibited even at a high temperature of 950 to 1000 ℃, and the composition can sufficiently cope with the recent trend toward high temperatures of internal combustion engines.

Needle punching treatment was performed on the above inorganic fiber mat to form a density of 100cm per unit²In which 50-3000 needle punching traces are present. When the number of the supporting gasket is less than 50, the supporting gasket has a large volume and cannot be packed in the metal case together with the catalyst carrier, and when the number of the supporting gasket exceeds 3000, the performance of the supporting catalyst carrier is lowered and the catalyst carrier may be detached.

In the first aspect of the present invention, the packing density of the support packing in the metal shell is preferably 0.15 to 0.45g/cm³. Less than 0.15g/cm³In the case where the force for supporting the catalyst carrier is less than 0.45g/cm, the force for supporting the catalyst carrier may be low³When it is used, the catalyst support may be damaged.

The supporting sealing gasket filled in the metal shell has a filling density of 0.15 to 0.45g/cm³When heated at 300 to 1000 ℃, a surface pressure of 5 to 500kPa is generated. Thus, the force for supporting the catalyst carrier is increased, and the catalyst carrier can be stably supported without shaking. Below 5kPa, the force for supporting the catalyst carrier may be too low, and above 500kPa, the catalyst carrier may be broken.

The temperature at which the surface pressure is measured is 300 to 1000 ℃ because the temperature is a temperature to which the catalyst carrier is subjected when mounted on an automobile.

According to the first aspect of the invention, the metal shell is preferably press-fitted. The press-fitting structure is a press-fitting type in which, when the catalyst carrier is placed in the metal case, the catalyst carrier coated with the support packing is press-fitted into the metal case by applying pressure. The metal shell has a specific shape, for example, a cylindrical shape. The press-fitting structure can prevent the catalyst carrier from shaking after installation.

The metal shell is preferably of a clam-shell construction. The clam-shell structure, for example, is comprised of 2 individual shell members, which are loaded with a catalyst carrier coated with a support mat material and then joined at the joints of the shell members with a weld, adhesive, or the like. This structure enables easy installation of the catalyst carrier into the metal shell.

The metal case is preferably of a wound structure. The roll-type structure is a metal shell structure formed by preparing a catalyst carrier coated with a support mat member and winding a metal thin plate around the catalyst carrier. According to this structure, the catalyst support can be easily mounted in the metal shell regardless of the shape of the catalyst support.

Next, in the second aspect of the invention, the content of the organic component in the above-described support gasket is preferably more than 0 and 1 wt% or less. When the amount exceeds 1 wt%, a firing process for firing the organic components may be required after the supporting sealing material is mounted in the metal case in order to achieve a specified emission standard.

The organic component contained in the support gasket is not particularly limited as long as it functions as a binder, and examples thereof include latex, polyvinyl alcohol, and the like.

The inorganic fiber mat is preferably made of inorganic fibers containing at least alumina or silica, and can improve heat resistance.

The supporting sealing material preferably contains alumina in an amount of 70 wt% or more, so that heat resistance can be improved. In addition, the elastic force at high temperature is increased, so that the difference in thermal expansion between the metal shell and the DP filter can be absorbed, and the ability of supporting the DP filter can be improved. Therefore, the DP filter is prevented from shaking, and an increase in vibration noise can be suppressed. In addition, their performance can be sufficiently exhibited even at a high temperature of 500 ℃. Can sufficiently cope with the recent trend toward higher temperatures of internal combustion engines.

Needle punching treatment was performed on the above inorganic fiber mat to form a density of 100cm per unit²In which 50-3000 needle punching traces are present. When the number is less than 50, the supporting sealing material is bulky and cannot be packed in the metal shell together with the catalyst carrier, and when the number exceeds 3000, the performance of the supporting catalyst carrier is lowered and the catalyst carrier may be detached.

The packing density of the supporting sealing gasket in the metal shell is preferably 0.15-0.55 g/cm³. Less than 0.15g/cm³The force supporting the DP filter may be too low, in excess of 0.55g/cm³The DP filter may be damaged.

The supporting sealing pad filled in the metal shell has a filling density of 0.15-0.55 g/cm³When heated at 300 to 500 ℃, a surface pressure of 5 to 1000kPa is generated. Thus, the force for supporting the DP filter is increased, and the DP filter can be stably supported without shaking. Below 5kPa, the force supporting the DP filter may be too low, and above 1000kPa, the DP filter may be broken.

The temperature at which the surface pressure is measured is 300 to 500 ℃ because the temperature is a temperature to which the DP filter is subjected when mounted on an automobile.

The metal shell is preferably press-fitted. The press-fitting structure is a press-fitting type in which, when the catalytic DP filter is disposed in the metal case, the DP filter coated with the support packing is press-fitted into the metal case by applying pressure. The metal shell has a specific shape, for example, a cylindrical shape. The catalyst holder support body can prevent the shaking of the catalyst carrier after mounting by the above press-fitting structure.

The metal shell is preferably of a clam-shell construction. The clamshell structure, for example, is comprised of 2 individual shell members, which are loaded with the DP filter covered with a backing gasket and then joined to the joints of the shell members with a weld, adhesive, or the like. According to this structure, the DP filter can be easily attached to the metal case.

The metal case is preferably of a wound structure. The roll-up type structure is a structure in which a DP filter coated with a support sealing material is prepared, and a metal sheet is wound around the DP filter to form a metal shell. According to this structure, the DP filter can be easily mounted in the metal shell regardless of the shape thereof.

Hereinafter, the first and second aspects of the invention will be described in detail with reference to examples. The first and second aspects of the present invention are not limited to this embodiment.

Example 1

The catalytic converter according to the embodiment of the first aspect of the present invention is described with reference to fig. 1 to 4.

As shown in fig. 1, the catalytic converter 5 of the present example is composed of a catalyst carrier 3 on which a catalyst for purifying exhaust gas components is supported, a metal shell 2 covering the side surface of the catalyst carrier 3, and a support packing 1 formed of an inorganic fiber mat disposed between the catalyst carrier 3 and the metal shell 2. The content of the organic component in the supporting gasket 1 is 0 to 8 wt%. The inorganic fiber mat constituting the supporting gasket material 1 was composed of 70 wt% of alumina and 30 wt% of silica, and was subjected to needle punching treatment. The packing density of the supporting sealing material 1 in the metal shell 2 was 0.35g/cm³。

As shown in fig. 2, the catalytic converter 5 is provided in the middle of an exhaust pipe 91 of the engine 9 at the bottom of a vehicle body 92 of the automobile.

The catalyst carrier is made of cordierite, which is one of ceramics. As shown in fig. 1, the catalyst carrier 3 is a honeycomb structure composed of an aggregate of a plurality of openings 30 opening on the upstream side and the downstream side of the exhaust pipe 91. The walls of the openings 30 have a plurality of open pores where a catalyst (e.g., platinum, rhodium, etc.) for purifying exhaust gas components is supported. Therefore, when the exhaust gas passes through the openings 30, exhaust gas components contained in the exhaust gas are purified by the action of the catalyst supported on the walls of the openings.

Next, a method for manufacturing the catalytic converter of this example will be explained.

First, an inorganic fiber composed of 70 wt% of alumina and 30 wt% of silica was formed into a coil. The web is subjected to a needle punching process by a needle punching apparatus. As shown in fig. 3, the needle punching device includes a needle plate 51 that can reciprocate in a punching direction, and a pair of support plates 52 that support the inner and outer surfaces of the web 10.

A plurality of needles 53 for perforating the web 10 are fixed to the needle plate 51. The density of the needle 53 is 100cm²There are 500 needle boards. Further, the support plate 52 is provided with a through hole 520 for a needle. If the needle plate 51 is reciprocated while passing through the web 10 between the pair of supporting plates 52, the needles 53 perforate the web 10 to form entanglements between fibers of the web 10. Thus, the inorganic fiber mat formed 100cm²There were 500 needle eye marks.

Next, the inorganic fiber mat is impregnated with an organic component by an impregnation method. The organic component in the inorganic fiber mat was impregnated in an amount of 1.5% by weight. As the organic component, latex is used. Thus, a support gasket was obtained.

Next, as shown in fig. 4(a), the support mat member 1 is cut to form an elongated member, and at both ends thereof, a concave portion 11 and a convex portion 12 are formed to be engaged with each other when wound around the outer periphery of the catalyst carrier 3.

Next, as shown in fig. 4(b), the support packing 1 is wound around the catalyst carrier 3, and the concave portions 11 and the convex portions 12 are engaged with each other.

Next, the catalyst carrier 3 around which the supporting sealing material 1 is wound is mounted in the cylindrical metal shell 2.

As a result, the catalytic converter 5 of the present example was obtained as shown in fig. 4 (c).

When the surface pressure of the supporting sealing material was measured, the temperature was raised to 1000 ℃ over 30 minutes, and the temperature was held at 1000 ℃ for 10 minutes. The temperature of the supporting gasket was maintained at 1000 ℃ for 10 minutes. The thermal expansion of the measuring jig or the like was measured in advance, and after calibration, the load (compressive load) after holding for 10 minutes was measured. The sample size of the support gasket material was 25mm by 25 mm.

As a result of measurement by this method, the surface pressure of the supporting sealing material was 110 kPa.

Next, the catalyst converter was mounted on an automobile and a driving test was carried out, and as a result, the catalyst carrier did not shake and remained stable even if vibrated during driving. The vibration sound of the catalyst converter as the exhaust gas purifying apparatus is almost none.

From this, it was found that the support mat can exert a force of supporting the catalyst carrier at a high temperature.

In this example, the supporting sealing material contains a small amount of organic components. The organic component functions as a binder for the supporting sealing material, and can suppress the volume of the supporting sealing material to some extent. Therefore, the mountability of the catalyst carrier wound with the support sealing material into the metal shell is improved.

Further, as described above, since the content of the organic component in the supporting sealing material is small, the amount of the exhaust gas component is not deteriorated by the combustion gas generated at the time of heating.

Example 2

In the catalytic converter of this example relating to the first aspect of the invention, a honeycomb-shaped cordierite monolith having an outer diameter of 130mm and a length of 100mm was used as the catalyst carrier. The catalyst carrier has a plurality of square holes formed along the axial direction, and porous partition walls for supporting a catalyst component such as platinum are disposed between the holes.

In addition, the metal case is made of SUS304, having a clam-shell structure.

In the production of the catalytic converter of this example, a support mat member was wound around the surface of the catalyst support body, and then the support mat member was mounted in a two-piece shell member, and the shell member was closed and fused into a cylindrical metal shell, as in example 1.

The rest is the same as in example 1. The same effects as in example 1 can be obtained in this example.

Example 3

The metal shell of the catalytic converter of the present example relating to the first aspect of the invention is of a coiled structure.

After the support mat member was wound around the surface of the catalyst carrier, several turns of a thin metal plate having a thickness of 1.5mm, a width of 141mm and a length of 120mm were wound around the surface of the support mat member.

The rest is the same as example 1. The same effects as in example 1 can be obtained in this example.

Test example 1

In the present example relating to the first aspect of the invention, the content of the organic component in the support mat for the catalyst carrier, the density of the pinhole marks, and the packing density of the inorganic fiber mat were changed, and the surface pressure of the support mat, the assemblability, the presence or absence of cracking and detachment of the catalyst carrier, and the exhaust gas test were performed while measuring the surface pressure and the assemblability of the support mat. The results are shown in Table 1.

The method for measuring the surface pressure in example 1 was used for measuring the surface pressure of the support packing.

The presence or absence of the catalyst carrier was evaluated, and the presence of cracks was indicated by "x" and the absence thereof was indicated by "o".

The presence or absence of the catalyst carrier separation was evaluated, and the presence or absence of the separation was indicated by "x" and the absence thereof was indicated by "o".

In the exhaust gas test, the presence or absence of an abnormality in exhaust gas control using oxygen sensors disposed on the upstream side and the downstream side of the catalytic converter was evaluated. When the inorganic fiber mat contains a large amount of organic components, the exhaust gas control becomes abnormal, and as a result, harmful gases are generated. Thus, when an abnormality in exhaust gas control occurs, it is indicated as "x", and when no abnormality occurs, it is indicated as "o".

As is clear from Table 1, the content of the organic component in the inorganic fiber mat was 0.1 to 2% by weight and counted at 100cm²The needle punching treatment is performed at a density of 50 to 3000, and the packing density is 0.15 to 0.45g/cm³In this case, the mounting assembly is excellent, and exhaust gas generated by the support gasket is not generated.

On the other hand, although not shown in the table, when the organic component is 0, the fibers of the support packing scatter, and the mountability is deteriorated.

Example 4

A DP filter according to an embodiment of the second aspect of the invention will be described with reference to fig. 5.

As shown in fig. 5, the DP filter system 4 of this example is composed of a DP filter 6 for trapping diesel particulates, a metal shell 8 covering the side surface of the DP filter 6, and a support packing 7 formed of an inorganic fiber mat disposed between the DP filter 6 and the metal shell 8.

The content of the organic component in the supporting gasket 7 was 1% by weight. The inorganic fiber mat constituting the supporting gasket material was composed of 70 wt% of alumina and 30 wt% of silica, and was subjected to needle punching treatment. The packing density of the supporting gasket 7 in the metal case 8 was 0.35g/cm³。

The DP filter system 5 is provided in the middle of an exhaust pipe 91 of the diesel engine 9 located at the bottom of a vehicle body 92 of the automobile, as shown in fig. 2.

DP filters are made of cordierite, a ceramic one. As shown in fig. 5, the DP filter 6 is a honeycomb structure composed of an aggregate of a plurality of pores that are open on one side and closed on the other side upstream or downstream of the exhaust pipe 91. The DP filter 6 allows exhaust gas to pass through the porous cell walls from the upstream side holes 61 to the downstream side holes 62. At this time, diesel particulates contained in the exhaust gas component are captured on the pore walls, and the exhaust gas is purified.

The trapped diesel particles are burned off by an ignition device not shown in the figure.

Next, a method for manufacturing the DP filter system of this example will be described.

First, a support gasket was produced by the same method and conditions as in example 1. Except that the organic component in the inorganic fiber mat was impregnated in an amount of 1% by weight.

Next, in the same manner as in example 1, the support packing 7 was cut into a predetermined shape, wound around the DP filter 6, and housed in the cylindrical metal case 8 in the manner shown in fig. 4. As described above, the DP filter system 5 of this example is obtained as shown in fig. 5.

When the surface pressure of the supporting sealing material was measured, the temperature was raised to 500 ℃ over 30 minutes, and the temperature was maintained at 500 ℃ for 10 minutes. The temperature of the support packing was maintained at 500 ℃ for 10 minutes. The thermal expansion of the measuring jig or the like was measured in advance, and after calibration, the load (compressive load) after holding for 10 minutes was measured. The sample size of the support gasket material was 25mm by 25 mm.

As a result of measurement by this method, the surface pressure of the supporting sealing material was 180 kPa.

The packing density of the supporting sealing gasket in the metal shell is 0.35g/cm³The thickness is 6 mm.

In addition, according to the same method as in example 1, the DP filter system in which the DP filter and the support packing were mounted was subjected to a running test, and as a result, the DP filter was not shaken and was kept stable even when it was vibrated during running. The vibration sound emitted from the DP filter system as the exhaust gas purifying device is almost none.

From this, it was found that the support gasket can exhibit a supporting force for supporting the DP filter at a high temperature.

In this example, the support gasket contains a small amount of organic components. The organic component functions as a binder for supporting the gasket, and suppresses the bulkiness of the supporting gasket to some extent. Therefore, the installation performance of the DP filter of the winding support gasket material into the metal shell is improved.

Further, as described above, since the content of the organic component in the support gasket is small, the cushioning property of the support gasket can be maintained, and the force for supporting the DP filter is also good.

Test example 2

In the present example relating to the second aspect of the invention, the surface pressure of the supporting seal material, the ease of mounting, and the presence or absence of cracking or detachment of the DP filter were measured by changing the content of the organic component in the supporting seal material for supporting the DP filter, the density of the pinhole mark, and the packing density of the inorganic fiber mat. And a degassing test was performed. The surface pressure of the support packing was measured by the method of example 4. The other items were measured in the same manner as in example 1. The results are shown in Table 2.

As is clear from Table 2, the content of the organic component in the inorganic fiber mat was 0.1 to 2% by weight and the content was 100cm²The needle punching treatment is performed at a density of 50 to 3000, and the packing density is 0.15 to 0.55g/cm³Particularly 0.15 to 0.45g/cm³In this case, the mounting property is good, and exhaust gas due to the support packing is not generated.

On the other hand, although not shown in table 2, when the organic component is 0, the fibers of the support packing scatter, and the mountability deteriorates.

As described above, according to the present invention, there are provided a catalyst converter including a support mat member for supporting a catalyst carrier, which is easy to handle and has excellent cushioning properties when the catalyst carrier is loaded into a metal casing, and a diesel particulate filtering system including a support mat member which is easy to handle and has excellent cushioning properties when a DP filter is loaded into a metal casing.

Claims

1. A gasket for supporting, which is disposed between a catalyst carrier and a metal shell covering the outside of the catalyst carrier or between a diesel particulate filter and a metal shell covering the outside of the diesel particulate filter, characterized in that the gasket for supporting is composed of 50 to 3000 pieces/100 cm²Is needle punched and has an organic binder content of more than 0 and 2 wt% or less,

at 0.45g/cm³When the filling density of the supporting sealing gasket is heated at 1000 ℃, the supporting sealing gasket is producedGenerating a surface pressure of 266-466 kPa.

2. The supporting mat member of claim 1, wherein said inorganic fiber mat is composed of inorganic fibers containing at least alumina or silica.