JP2003097253A - Porous metallic complex, dpf using porous metallic complex, and diesel exhaust gas purifier provided with dpf - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter with small specific heat and large thermal conductivity, wherein a catalyst is carried efficiently with excellent dispersibility. SOLUTION: A porous quality metallic complex comprises wire metal mesh consisting of a metal wire made of conductive metal and having a number of meshes, and a powder sintered layer made of metallic powders, wherein the combined function of the filtering function and the heating function is included.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-heating type filter capable of heating the filter itself, particularly particulates (fine powder) in exhaust gas discharged from a diesel engine or the like.
Which is a self-heating type filter for collecting
Porous metal composite for Diesel Particulate Filter, D
The present invention relates to a diesel exhaust gas purification device equipped with a PF and a DPF.

[0002]

2. Description of the Related Art A diesel particulate filter (hereinafter referred to as DPF) is used to collect particulates contained in exhaust gas of a diesel engine. The DPF is formed of a honeycomb-shaped tubular body made of ceramic such as cordierite. Particulates represented by soot (Powdered metal: Partic
mate Material (hereinafter referred to as PM) causes health hazards, so reduction from exhaust gas was a social issue. DPF
Is provided on the downstream side of the exhaust pipe and allows the exhaust gas discharged from the engine to permeate therethrough, and collects the particulates contained in the exhaust gas at the time of the permeation. When the amount of particulates collected by the DPF reaches a predetermined amount, regeneration processing of the DPF for functional recovery is performed. In the regeneration process, the DPF is heated by a heater or the like, and the collected particulates are burned to restore the function as a filter again. Conventionally, as a filter of the first example that collects particulates discharged from a diesel engine or the like, an upstream portion of a filter made of ceramics is used to heat and burn off particulates adhering to the filter to regenerate the filter. It is known that a heater for reproduction is provided (for example, see Japanese Patent Publication No. 62-39247).

In addition, in place of the heater, a regeneration burner is installed in particular, and a flame is blown to the filter for regeneration.
Example filters are also proposed. In addition, a self-heating type filter, which is a third example of a filter in which a honeycomb ceramic filter is formed of conductive silicon carbide, and which itself is electrically heated to burn and regenerate, has been proposed (JP-A-57). -
(See Japanese Patent No. 110311).

[0004]

Generally, the ceramic filters which have been widely used conventionally have the following problems. (1) The specific surface area is small, and the catalyst cannot be efficiently loaded with good dispersibility. Therefore, there is a problem that a large amount of catalyst is required to be supported. (2) Since the specific heat is large, it takes a long time to reach the catalyst activation temperature by the exhaust heat. (3) Since the thermal conductivity is small, the temperature of the filter tends to be non-uniform, and there is a problem in that PM combustion unevenness due to the catalyst occurs.

Further, in the conventional filters of the first to third examples,
There are the following problems. In the conventional filter of the first example, unless the collected amount of particulates is accurately detected, if the collected amount is small, it will be misfired and regeneration as a filter will be difficult, while if it is large, cracking or melting will occur. To lose. In addition, since temperature distribution tends to occur and mechanical strength is weak, various problems such as easy cracking occur. The conventional filter of the second example requires a special mechanism called a burner device, and similarly to the filter of the first example, there are problems such as cracking of the filter during regeneration. In the conventional filter of the third example, since silicon carbide has a large shrinkage rate during molding and firing, it is difficult to manufacture the filter. Furthermore, cracks are likely to occur during heating and regeneration during use. In addition, in relation to this, there are problems that the shape that can be molded is limited, it is difficult to design the electric resistance value of the filter, and the degree of freedom in geometrical design is small. In view of such conventional problems, the present invention intends to provide a porous metal composite which is excellent in strength during heating and regeneration and collection efficiency of fine metal powder and is easy to manufacture, and a DPF filter using the same. Is.

[0006]

SUMMARY OF THE INVENTION The present invention has the following structure. The reference numerals in the attached drawings are attached to the reference numerals in parentheses O for reference.

[Means 1] A metal net (2) made of a conductive metal wire (1) and having a large number of meshes, and a metal powder (3) disposed on the meshes of the metal mesh (2) and sintered. A porous metal composite (5) composed of the powder sintered layer (4) of (1), which has a composite function of a filter function and a heater function. [Means 2] The porous metal composite (5) according to means 1, wherein the mesh has an opening diameter of 5 to 1000 μm. [Means 3] The wire mesh (2) is the porous metal composite (5) according to the means 1 of a flat weave. [Means 4] The wire mesh (2) and the metal powder (3) are made of SUS alloy, Fe-
The porous metal composite (5) according to means 1 which is either a Cr-Al alloy or a Ti-Al alloy. [Means 5] D using the porous metal composite (5) according to means 1
It is PF. [Means 6] A DPF in which the platinum group metal powder is sintered and supported on the porous metal composite (5) according to the means 1. [Means 7] A diesel exhaust gas purifying apparatus for a two-cycle vehicle or a mower equipped with the DPF according to the means 6 or 7. [Means 8] A wire mesh (2) of a mesh member formed of a metal element wire (1) made of any one kind of metal material selected from stainless steel, Fe, Al, or Ti and alloys thereof (2 )
And a metal powder (3) made of the above-mentioned metal material supported and sintered on the surface of the wire mesh (2) of the mesh member, which is a porous metal composite (5). (Means 9) Stainless steel or Al, Fe or Ti and alloys thereof, a wire mesh (2) of a mesh member formed of a metal wire (1) made of any one kind of metal material is Combined three-dimensional reticulated wire mesh (2) and the three-dimensional reticulated wire mesh (2)
A porous metal composite having a powder sintered layer of a porous layer on which the metal powder (3) made of the metal material is carried and sintered on the surface of. [Means 10] The metal mesh (2) of the mesh member is a plain woven wire mesh or a pressed plain woven wire mesh according to the means 8 or 9 of the porous metal composite.
(5). [Means 11] The porous metal composite according to means 8 or 9, wherein the metal powder (3) is formed of a regular metal powder. [Means 12] The porous metal composite according to means 8 or 9, wherein the metal powder (3) is composed of an amorphous metal powder. [Means 13] A perforated metal wire net (2) made of any one metal material selected from stainless steel, A1, Fe or Ti and its alloys, and the perforated metal wire net
Metal powder (3) made of the above metal material is carried on the surface of (2).
A porous metal composite having a powder-sintered layer of a sintered porous layer. (Means 14) A wire mesh of a structure in which a wire mesh (2) of punching metal made of any one kind of metal material selected from stainless steel or Al, Fe or Ti and its alloys is three-dimensionally combined ( 2) and a powder sintered layer (4) of a porous layer in which the metal powder (3) made of the above metal material is carried and sintered on the surface of the wire mesh (2) of the structure. It is a porous metal composite.

{Action} In the porous metal composite of the present invention, the metal wire is substantially covered with the sintering powder, and most of the mesh of the wire mesh is opened. D according to the present invention
The PF filter can capture the fine metal powder by adsorption on the filter surface. By using a filter having a surface on which the powder is sintered, fine metal powder such as particulates is captured.

In the present invention, since the mesh of the wire mesh is left as the openings, it is caused by the blockage of the void which is a problem in the conventional exhaust gas filter which uses the internal void of the porous material layer as a filter for trapping particulates. It is possible to prevent a rapid decrease in life. Sintering the powder into the wire mesh has the effect of controlling the opening diameter of the mesh by controlling the particle size and amount of the powder, and even if the mesh is large, it has the effect of reducing the size by filling with powder. It has the advantage that it can be avoided. According to the present invention, the opening diameter of the mesh can be set to 1000 μm or less, more preferably 200 μm or less, and further preferably 100 μm or less. In the present invention, if the powder to be sintered to the metal element wire is a metal powder, it may be said that they are metals, and it is preferable because it is easier to sinter than the case of sintering a ceramic powder having poor sinterability.

In the present invention, the reason why the wire net is used is that it is difficult to sinter into a net shape only by the sintered body, and it is difficult to sufficiently maintain the strength as a member only by the sintered body. The wire mesh is also effective because it has the advantage that regular openings can be easily obtained. Further, it is preferable that the metal wire is substantially covered with the sintered powder. If the coating of the metal wire is insufficient, that part of the metal wire may be oxidized and damaged, or the sintered powder may be separated from the metal wire, which is not preferable. Also, if the powder that forms the surface is made of an alloy with high heat resistance and the metal mesh inside the filter is made of inexpensive stainless steel, the manufacturing cost of the filter can be reduced, but in this case, the metal mesh inside the filter can be protected. Therefore, it is desirable that the metal wire is substantially covered with the sintered powder.

In consideration of corrosive environment such as exhaust gas, stainless steel is preferable as the wire net. Particularly preferably, in order to reduce thermal fatigue damage due to exhaust gas, a low thermal expansion coefficient is preferable, and a ferritic stainless steel having a lower thermal expansion coefficient than martensitic or austenitic stainless steel is preferable. As a typical steel for wire mesh, SU
In addition to ferritic stainless steel such as S430, SUS429, SUS405, and SUS434, SUS304, if corrosion resistance is required,
Austenitic stainless steels such as SUS316, SUS347, SUSXM7, etc.
0, SUS416, SUS420J1, SUS420J2, SUS440C
A stainless wire such as can be adopted. Further, since the metal powder is in direct contact with the exhaust gas or the like, a material having higher corrosion resistance and heat resistance than the wire mesh is required. Fe-Cr-Al alloy and Ti-Al, which are preferably oxidation resistant alloys
Alloys can be used.

In the Fe-Cr-Al alloy, Cr is Cr2O3.
An oxide film mainly composed of a system is formed, and in order to further secure heat resistance, the addition of Al that forms an oxide film of A1203, which is excellent in the protective property and adhesion of the film, is effective. The preferred amount of Cr is 15
-30%, more preferably 18-28%. Further, Al is an element that increases the coefficient of thermal expansion, and it is preferable that the amount is small in order to prevent thermal fatigue damage, and the higher is preferable from the viewpoint of oxidation resistance.
The preferred amount of Al is 2-12%. In the present invention, when used as an alloy powder, deterioration of cold workability due to an increase in the amount of Al does not pose a problem, so 5% or more of Al can be added.
A more preferable range is 5-9%.

Next, the metal net used in the porous metal composite according to the present invention will be described. An example of the form of the wire net will be described with reference to FIG. Fig. 1 (a) shows a flat-woven woven wire mesh, and Fig. 1 (b) shows a twill-woven wire mesh. Both are tatami. A flat tatami woven wire mesh is one in which vertical lines and horizontal lines intersect each other, and the vertical lines are thicker than the horizontal lines, and the horizontal lines are arranged adjacent to each other. A wire mesh (JIS G3555DW). In addition, the twill tatami woven wire mesh refers to a weave composed of thick vertical lines and horizontal lines, the horizontal lines being arranged adjacent to each other, and more than two vertical lines and horizontal lines crossing each other. Rather, a weave is shown in FIG. 1 (c). Rather, weaving means a weaving method in which about 5 lines in the lengthwise direction and about 6 lines in the horizontal direction are collectively woven.

The wire mesh used in the porous metal composite of the present invention is preferably prepared by pressing down the wire mesh woven as described above to make the mesh finer. At that time, the plain weave shown in FIG. 1 (d) cannot be expected to have a mesh refinement effect. However, it is also possible to use the plain weave shown in FIG. 1 (d) from the total point of view such as application as a DPF filter and cost.

The tatami woven wire mesh and the woven wire mesh are common in that a mesh is formed in a direction substantially orthogonal to the plane, and other meshes are formed in a direction substantially orthogonal to the plane of the wire mesh. Weaves are also included in the present invention. Normal plain weave wire mesh (JIS G3
555PW), twill weave wire mesh (JIS G3555TW) is different from the mesh formed on the plane of the wire mesh.

The reason why the tatami woven wire mesh, in which the mesh is formed in the direction substantially orthogonal to the plane as described above, rather the woven wire mesh is applied will be described. It is difficult to make the mesh finer even if the ordinary plain weave wire mesh or the twill weave wire mesh is increased in rolling reduction, whereas the tatami woven wire mesh or rather the woven wire mesh has a mesh formed in a direction substantially orthogonal to the plane. Therefore, the mesh can be easily made finer even if the rolling reduction is small. Figure 2 shows the refinement process of the mesh when the rolling reduction is used as a parameter. In Fig. 2, (a) rolling reduction of 0% ⇒ (b) rolling reduction of 30% ⇒ (c) rolling reduction of 40% ⇒ (d) rolling reduction of 50%, and the mesh formed in the direction substantially orthogonal to the plane is the rolling reduction. Becomes finer as

When the tatami weave or rather the woven wire mesh is pressed, the reduction rate is preferably 5 to 50%. If the reduction rate is less than 5%, the effect due to the reduction is not substantially observed, and if the reduction rate exceeds 50%, the amount of exhaust gas that can pass through the metal filter obtained after the reduction is reduced.

The opening diameter of the pressed wire mesh is 1000 μm or less, 5
More preferably, it is set to 120 μm. The wire mesh needs to have a fine mesh to some extent in order to retain the fine metal powder on the surface thereof. If the mesh opening diameter is smaller than 5 μm, the amount of permeated exhaust gas becomes unrealistically small and it cannot be used in practice. The opening diameter is 12
If it is larger than 0 μm, it is necessary to increase the particle size of the powder in order to prevent the powder of the metal powder sintered layer forming the mesh from coming out of the mesh, and the opening diameter required for the powder sintered layer cannot be obtained. . The powder sintering layer can determine the average particle diameter of the powder used according to the required opening diameter. The average particle size of the powder used is preferably 3 to 50 μm.

The sintered layer is required to have fine openings especially at the surface portion as compared with the substrate portion. However, when powder having a single average particle size is used, a powder having a particle size corresponding to the required opening diameter of the surface should be used. Must be used. In addition, it is necessary to make the powder itself fine in order to obtain a fine opening diameter, and when applying to one side of a wire mesh with a relatively large opening diameter, it is difficult to apply because it penetrates from the hole of the substrate to the opposite side Is. Depending on the filtering characteristics required there, a sintered layer composed of a first powder metal powder having a relatively large average particle size is formed on the substrate portion, and a second powder having a relatively small average particle size is formed thereon. When the sintered layer made of metal powder is formed, the opening diameter gradually decreases from the opening diameter of the substrate portion, so that a fine opening can be easily obtained without reducing the amount of permeated exhaust gas. It should be noted that powders having different average particle diameters of three layers or four layers may be used depending on the required filtering characteristics.

The wire mesh for a porous metal composite according to the present invention is obtained by sintering a powder obtained by pressing down a tatami-woven or rather woven wire mesh, and applying a pressure after applying the powder. Should be included. Further, in the above-mentioned pressurization, the reduction rate is preferably 5 to 20% with respect to the thickness of the powder coating layer. By applying pressure after applying the powder, the thickness of the powder becomes uniform and the thickness of the sintered layer does not partially differ, and the contact area between the powders increases and the sintering efficiency improves. To do.

If the particle size of the metal powder is too small, the price becomes high (grinding time becomes long), and if it is too large, fine openings cannot be obtained. Therefore, it is preferable to use a metal powder having an average particle size of 10 to 400 μm. preferable. The sintering temperature may be determined according to the material of the metal powder, but if it is too low, a sufficient sintering density cannot be obtained and the strength decreases, while if it is close to the melting point of the metal, each metal powder will fuse. On the contrary, a coarse opening is formed.

The porous metal composite preferably has an opening diameter of 5 to 1000 μm. If the opening diameter is too large, even if it is used for air purification, it becomes impossible to block fine foreign matter, and it becomes impossible to obtain clean air. Therefore, it is necessary to set it to 1000 μm or less.

In the porous metal composite of the present invention, the metal powder is a metal powder for increasing the surface area, and is shaped metal powder (spherical or granular powder metal powder) or amorphous metal powder (corner powder metal powder). However, it may be in the form of scales or flakes. When a melting means such as baking is adopted for fixing to the wire net, it is preferable that the material is the same as that of the substrate because it is familiar. However, even if the materials are different, they can be fixed by using an appropriate amount of an appropriate binder. When the base material and the metal powder for increasing the surface area are different materials, the linear expansion coefficient should be matched, or the elasticity of one of the materials should be maintained to match the linear expansion. is necessary. As the binder, inorganic glass, frit (powder), metal powder, ordinary thermoplastic resin, or the like can be used. In order to stack the metal powder for increasing the surface area, there are means such as repeating spraying and dipping several times, and repeating transfer (printing) using a screen.

The porous metal composite of the present invention is not limited to a flat plate shape, but can be formed into various shapes depending on the application, the installation place and the like. That is, in the present invention, the sheet-shaped porous metal composite is processed into a predetermined shape or formed by combining these, and can have a three-dimensional shape such as a ball shape, a honeycomb shape, or a lattice shape. Of
For example, a honeycomb shape is particularly useful for purifying exhaust gas.

Hereinafter, the present invention will be described in more detail with reference to examples. Example 1 # 40/200 mesh flat tatami SUS316L with a thickness of 0.4 mm
Roll the wire mesh at a rolling reduction of 30% to a thickness of 0.28 mm and a mesh diameter of 42.
Obtain a μm substrate. SUS316L powder having an average particle size of 10 μm and water are mixed and coated on the substrate to a thickness of 60 μm. At this time, it is also possible to apply with a spray gun. After drying, 30%, 40%, 50
After pressurizing at a reduction rate of%, sinter in a vacuum atmosphere at 990 ° C. for 2 hours. 2 (a) to 2 (d) schematically show the shape of the mesh.

FIG. 4 shows a sectional structure diagram of the obtained DPF filter. Figure 4 (a) is a figure when the magnification is 80 times, Figure 4 (b)
Is a diagram when the magnification is 400 times. Reference numeral 1 is SUS31
A metal wire 3 having a thickness of 0.28 mm and a mesh diameter of 42 μm was obtained by rolling a 6 L metal wire 1 into a wire mesh 3 with a flat tatami weave and rolling at a reduction rate of 40%. Reference numeral 5 is a powder sintered layer obtained by sintering SUS316L powder 4. As shown in the figure, the DPF filter obtained by the present invention achieves the filter performance according to the application by the powder sintered layer 5, and the DPF filter by supporting the powder sintered layer 5 on the wire mesh 3. As a whole, the mechanical strength is higher than that of the ceramic filter.

(Example 2) A porous metal composite in which SUS powder is applied to a plain woven wire mesh of SUS316 and sintered to carry a platinum-based catalyst material on the powder will be described. First, SUS
Prepare 316 powder. 70 vol% of this powder is mixed with 30 vol 1% of an aqueous solution of 1 vol% of polyvinyl alcohol to form a slurry. On the other hand, a wire mesh using stainless SUS316 wire as a metal element wire is prepared. The slurry of the powder was filled in a spray gun and sprayed on the wire net. By applying with a spray gun, in this embodiment, the powder can be applied while opening all the meshes. After applying the powder,
Sinter at 1350 ° C. in vacuum to obtain DPF.

In order to evaluate the bending workability as a DPF, a 90-degree bending test specified by JIS Z2248 is carried out. In this embodiment, 90-degree bending can be performed.

A schematic diagram of the surface micro-sintered structure of a typical DPF of the present invention is shown in FIG. Since the mesh of the DPF of the present invention is open and the metal wire 1 carries the metal powder 3 and is sintered, the metal powder 3 is substantially covered with the sintered powder and has a large surface area. Is forming. Further, the original mesh size of the wire netting 2 is reduced by sintering the powder. This shows that the aperture diameter as a filter can be reduced,
A filter effective for capturing the fine metal powder can be formed.

Example 3 A diesel exhaust gas purification apparatus equipped with a DPF using the porous metal composite described in Example 2 will be described. The exhaust gas purification system shown in FIG. 5 is used by incorporating it into the exhaust system of the diesel engine 6. This exhaust gas purification system is composed of a DPF 10 arranged in a case 9 incorporated in an exhaust passage 8,
It is configured to collect particulates such as soot, carbon, and smoke contained in the exhaust gas by F10, and to discharge the clean exhaust gas in which the particulates are collected to the outside through the outlet side exhaust passage 11. There is. An exhaust manifold 7 attached to the diesel engine 6 is provided with a turbocharger 12. Turbocharger 1
The outlet of the second turbine 13 is connected to the inlet-side exhaust passage 8 through the exhaust pipe 14. In this exhaust gas purification system, the DPF 10 has carbon, soot, and H in the exhaust gas inside the case 9.
C, particulates such as black smoke are collected, and the collected particulates are heated and incinerated by the DPF 10. However, since the particulates collected by the DPF 10 are burnt by heating by energization, the DPF 10 is energized. An electric circuit 16 leading to a controller 15 provided with a DC power source is provided as a means. Further, in this exhaust gas purification device, a sensor 17 is installed in the inlet side exhaust passage 8 to detect the exhaust pressure, the gas temperature and the amount of particulates, and the outlet side exhaust passage
At 11, a sensor 18 is installed. Furthermore, in order to measure the temperature at the center of the DPF 10, the DPF 10 has a temperature sensor 1
9 is incorporated. The exhaust gas purifying apparatus according to the present invention is incorporated in an exhaust gas purifying system, and has a case 9 incorporated in the exhaust passages 8 and 18, a DPF 10 disposed in the case 9, and provided at both ends of the DPF 10, respectively. It has an electrode section 20. Next, the operation of this exhaust gas purification device will be described. The diesel engine 6 is started, and the exhaust gas discharged from the diesel engine 6 is the turbine 1 of the turbocharger 7.
Drive 3 Exhaust gas flows from the outlet of the turpin 13 to the exhaust pipe 14
And is sent to the exhaust passage 8. The exhaust gas is then
It is sent from the exhaust passage 8 through the inlet side annular passage into the DPF 10. The exhaust gas passes through the wire mesh 2 in the DPF 10, and at that time, particulates such as carbon, soot, and smoke contained in the exhaust gas are collected by the porous metal composite 5, and the cleaned exhaust gas is supported. It flows from the through hole of the cylindrical body to the outlet side passage, and then is discharged to the outside through the outlet side exhaust passage. Then, when a predetermined amount of particulates is collected in the DPF 10, electric power is supplied from the DC power source to the electrode portion 20 through the electric circuit 16, and the wire net 2 is energized. Wire mesh 2
Is energized, the DPF10 is heated, the collected particulates are incinerated by heat, and the DPF10 is regenerated.

The case where the porous metal composite according to the present invention is used for a DPF filter has been described above.
However, the porous metal composite according to the present invention can also be used as a catalyst substrate of a reformer of a fuel cell.

[0032]

As described above, the porous metal composite of the present invention and the DPF filter using the same have at least one or more of the following effects as compared with the conventionally used ceramic filters. (1) The specific surface area is several to ten times larger, and the catalyst can be efficiently supported with good dispersibility. Therefore, a large number of contact points can be formed with a small carrying amount, so that a high performance DPF filter can be obtained. (2) Since the specific heat is small, exhaust gas heat can reach the catalyst activation temperature in a short time, and PM combustion can be started. (3) Since the thermal conductivity is high, the temperature of the filter is likely to be uniform, and the uneven burning of PM by the catalyst is unlikely to occur.

[0033]

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a wire net used for a porous metal composite according to the present invention.

FIG. 2 is a three-dimensional schematic diagram of a wire mesh used in the porous metal composite according to the present invention, and is a diagram for explaining a difference in morphology depending on a rolling reduction.

FIG. 3 is a three-dimensional schematic diagram showing a porous metal composite for a DPF filter according to the present invention.

FIG. 4 is a cross-sectional view of a porous metal composite body for a DPF filter according to the present invention.

FIG. 5 is a diagram showing an example of a diesel exhaust gas purification apparatus according to the present invention.

[0034]

[Explanation of symbols]

1 metal strand 2 wire mesh 3 metal powder 4 Powder sintering layer 5 Porous metal composite 6 diesel engine 7 Exhaust manifold 8 Exhaust passage 9 cases 10 DPF 11 Exit side exhaust passage 12 Tarpo Charger 13 Turpin 14 Exhaust pipe 15 controller 16 electrical circuits 17 sensor 18 Exhaust passage 19 sensor 20 Electrode part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 53/94 B01J 35/04 B 4K018 B01J 35/04 B22F 7/04 J 4K020 B22F 7/04 C22C 33 / 02 102 C22C 33/02 102 47/14 47/14 F01N 3/10 A F01N 3/10 3/24 E 3/24 B01D 53/36 103C F term (reference) 3G090 AA01 BA04 CA03 EA01 3G091 AA03 AA07 AA15 AA18 AB03 AB13 BA00 BA39 CA03 GA06 GB01X GB06W 4D019 AA01 BA02 BB02 BB06 BB09 BD01 CB04 4D048 AA14 AB01 BA30X BA39X CD05 4G069 AA03 AA08 BA17 BA18 BC75B CA03 CA07 CA18 DA08 BA16 DA08 BA16 BA16 BA16 BA01 BA16 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 BA01 A01 BA01 A33 AA10 AA21 AC01 AC07 AC09 BA03 BB08 BC01

Claims (14)

[Claims] 1. A porous metal composite comprising a wire net made of a metal wire of a conductive metal and having a large number of meshes, and a powder-sintered layer of sintered metal powder arranged in the meshes. A porous metal composite having a composite function of a filter function and a heater function. 2. The porous metal composite according to claim 1, wherein the opening diameter of the mesh is 1000 μm or less. 3. The porous metal composite according to claim 1, wherein the metal mesh is a flat tatami mat. 4. The wire mesh and the metal powder are SUS alloy, Fe-Cr
2. The porous metal composite according to claim 1, which is either an Al alloy or a Ti-Al alloy. 5. A DPF using the porous metal composite according to claim 1. 6. A DPF in which the platinum group metal powder is sintered and supported on the porous metal composite according to claim 1. 7. A DPF equipped with the DPF according to claim 6 or 7.
A diesel exhaust gas purifier that is either a cycle vehicle or a mower. 8. A wire mesh of a mesh member formed of a metal wire made of any one kind of metal material selected from stainless steel or Fe, Al, or Ti and alloys thereof,
A porous metal composite comprising: a metal powder of the metal material, which is supported and sintered on the surface of a metal mesh of the mesh member. 9. A three-dimensional combination of a metal mesh of a mesh member formed of a metal element wire made of any one kind of metal material selected from stainless steel, Al, Fe, Ti and alloys thereof. A porous metal composite having a reticulated wire mesh and a powder sintered layer of a porous layer in which a metal powder of the metal material is carried and sintered on the surface of the three-dimensional reticulated wire mesh. . 10. The wire mesh of the mesh member is a plain woven wire mesh or a pressed plain woven wire mesh.
The porous metal composite described. 11. The porous metal composite according to claim 8, wherein the metal powder is a regular metal powder. 12. The porous metal composite according to claim 8, wherein the metal powder comprises an amorphous metal powder. 13. A perforated metal wire net made of any one kind of metal material selected from stainless steel or Al, Fe or Ti and its alloys, and a metal net on the surface of the perforated metal wire net from the metal material. A porous metal composite having a powder-sintered layer of a porous layer in which the metal powder is supported and sintered. 14. A wire mesh of a structure in which wire metal nets of punching metal selected from stainless steel or Al, Fe or Ti and alloys thereof and made of any one kind of metal material are three-dimensionally combined, A porous metal composite having a powder sintered layer of a porous layer in which a metal powder made of the above-mentioned metal material is carried and sintered on the surface of a metal net of the structure.