JP2002331245A - Porous body, method for manufacturing the same and flow channel forming member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous body capable of being precisely controlled in its pore size, reduced in pressure loss and heat treatment is not necessarily indispensable. SOLUTION: The porous body has a large number of pores 17 and contains a metal. A large number of the pores 17 are formed so as to extend in the almost same direction. The metal contains a large number of crystals 111. The respective crystals 111 extend almost in parallel to the extending direction of the pores 17. The pore size of the pores is not less than 0.01 μm and, when the length of the pores is set to 0.1 mm, the diameters at the respective parts of one pore are irregular within a range of ±1% or less of the pore size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous body, a method of manufacturing the same, and a flow path forming member. And a flow path forming member.

[0002]

2. Description of the Related Art Porous materials are generally used in various fields, such as catalyst carriers, various filters, and positive and negative electrode current collectors of batteries.

As such a porous body, for example, Celmet (registered trademark) manufactured by Sumitomo Electric Industries, Ltd.
Sumitomo Electric's porous body) is known. This porous body made by Sumitomo Electric is a porous metal body manufactured by plating a foamed resin and then burning out the foamed resin by heat treatment, and contains nickel or a nickel-chromium alloy as a main component. The skeleton of the porous body has a three-dimensional network like sponge, and has a large porosity. Further, all the pores are connected, there is no clogging, and the minimum pore diameter is about 0.5 mm.

As a porous material, Mott Co., Ltd.
ott porous metal (trade name) is known. Mo
The tt porous metal has a high filtration accuracy, a large pressure difference, and a strength such that it can be used even when the flow rate is large. The pore diameter is in the range of 0.1 to 100 μm.

Further, a porous silicon nitride ceramic is also known as a porous body. This porous silicon nitride ceramics achieves both porosity and contradictory characteristics by selectively growing silicon nitride crystal particles having anisotropy. Porous silicon nitride ceramics having a porosity of 40 to 50% have been developed, and the pore diameter is 0.2 to 2.0 μm.

Further, Functional Materials, April 2000, Vol.
20, no. 4, pages 27 to 34, "Light and Strong Porous Metal" (hereinafter referred to as prior art document) discloses a porous metal having unidirectional multi-core pores.
In this porous metal, the diameter of the pore is several μm to 10 m.
m.

[0007]

First, the porous body manufactured by Sumitomo Electric and the porous metal described in the prior art document have a large variation in the pore diameter. Furthermore, the pore diameter is 1μ
m or less cannot be manufactured. In the case of the Mott porous metal and the porous silicon nitride ceramics, the average pore diameter on the outermost surface can be made 1 μm or less, but the pore diameter sometimes partially exceeds 1 μm. That is, there is a problem that the pore diameter cannot be accurately controlled in any of the above-described porous bodies.

In addition, the porous body, the Mott porous metal, and the porous silicon nitride ceramic manufactured by Sumitomo Electric Co., Ltd. have a problem that the pressure loss when flowing gas or fluid in one direction is large because the pores are not connected linearly. was there.
Further, in the porous metal disclosed in the prior art document, the pores are unidirectional and multifilamentary, but there is a problem that pressure loss is large due to variations in diameter and direction. That is,
Any of the above-mentioned porous bodies has a problem that the pressure loss is large.

Further, any of the above-mentioned porous bodies has a problem that heat treatment is required for production.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a porous body whose pore diameter is accurately controlled.

Another object of the present invention is to provide a porous body having a small pressure loss when gas or fluid is permeated.

Still another object of the present invention is to provide a porous body which can be manufactured without heat treatment.

[0013]

A porous body according to the present invention has a plurality of pores and contains a metal. The plurality of pores are formed so as to extend in substantially the same direction. The metal includes a plurality of crystals, each of the plurality of crystals extending substantially parallel to the direction in which the pores extend.

In the porous body configured as described above, the plurality of pores are formed so as to extend in substantially the same direction. Low pressure loss when liquid or gas is permeated. Further, since each of the metal crystals extends substantially parallel to the direction in which the pores extend, the gas or liquid flows smoothly on the wall surfaces of the pores, and the pressure loss is further reduced.

Preferably, the diameter of the pore is 0.01 μm.
m or more. Here, the diameter of the pore refers to the diameter of the pore on the surface of the porous body.

Preferably, when the length of the pore is 0.1 mm, the diameter of each part of one pore is ±± the diameter of the pore.
It varies within the range of 1% or less.

Preferably, the total number of pores is
The diameter of 70% of the pores varies within a range of ± 10% or less of the average diameter. The average diameter refers to an average diameter of a plurality of pores in a porous body having a plurality of pores formed therein.

Preferably, the porous body further includes a plurality of particles filled in the pores. The pore diameter is 0.
1 μm or more.

Preferably, the diameter of the particles is 0.01 μm.
m or more and less than the diameter of the pores. Also, preferably, when the length of the pore is 0.1 mm, the diameter at each portion of one pore varies within a range of ± 10% or less of the diameter of the pore.

Preferably, the total number of pores is
The diameter of 70% of the pores varies within a range of ± 20% or less of the average diameter.

Preferably, the particles include at least one selected from the group consisting of ceramic particles, metal particles, catalyst particles and catalyst carrier particles.

Preferably, the length of the pores is substantially equal to the thickness of the porous body, and the thickness of the porous body is 10 mm or less.

The flow path forming member according to the present invention has a plurality of flow paths and contains metal. The plurality of flow paths are formed to extend in substantially the same direction. The metal includes a plurality of crystals, and each of the plurality of crystals extends substantially parallel to a direction in which the flow path extends.

In the flow path forming member thus configured,
Since the plurality of flow paths are formed so as to extend in substantially the same direction, the pressure loss when the liquid or gas is transmitted through the flow path forming member is smaller than when the flow paths extend in random directions. . Further, since each of the metal crystals extends substantially parallel to the direction in which the flow path extends, gas or liquid flows smoothly on the wall surface of the flow path, and the pressure loss is further reduced.

A method for manufacturing a porous body according to one aspect of the present invention includes a plurality of core layers each including a first material, and a second core layer covering the plurality of core layers and different from the first material. And a step of preparing a multifilamentary wire composed of an outer layer containing the above material and a step of removing a plurality of cored layers to obtain a porous body.

According to the method for manufacturing a porous body having such steps, the porous body can be obtained by removing the core layer of the multi-core wire. Therefore, by controlling the diameter of the core layer, the pore diameter of the porous body can be accurately controlled. Further, since the porous body is obtained by removing the core layer, each of the plurality of pores is formed so as to extend in substantially the same direction. Therefore, the pressure loss when a liquid or a gas is allowed to permeate the porous body is smaller than when the pores extend in random directions.

Preferably, the method for producing a porous body includes the steps of:
The method further includes a step of cutting the multifilamentary wire along a direction intersecting the length direction. The step of removing the plurality of core layers is performed after the step of cutting the multi-core wire. In this case, a plate-like porous body can be obtained. Furthermore, since the core layer is removed after cutting, the core layer is easily removed.

The step of preparing a multi-core wire comprises preparing a single-core wire consisting of a single core layer and an outer layer covering the single core layer; Obtaining a multifilamentary wire by plastically working the first pipe after disposing it in the first pipe made of a material.

In this case, in order to produce a multifilamentary wire by plastic working, the position of the pores,
It is possible to reliably control the absolute value of the diameter of the pore and the variation in the diameter.

Preferably, the step of preparing the multi-core wire includes a step of plastically working the second pipe after disposing a plurality of multi-core wires in the second pipe made of the second material.

Preferably, the step of preparing a single core wire includes filling the third pipe with a metal as the first material and then plastically processing the third pipe.

Preferably, the step of preparing a single core wire includes filling the third pipe with carbon as the first material and then plastically processing the third pipe.

Preferably, the step of preparing the single core wire includes filling the third pipe with an organic material as the first material and then plastically processing the third pipe.

Preferably, the step of removing the plurality of core layers includes etching to selectively remove the first material. In this case, a porous body can be obtained by removing the core layer without performing heat treatment.

Preferably, the step of removing the plurality of core layers includes heating to selectively remove the first material.

Preferably, the step of removing the plurality of core layers includes dissolving the first material in a solvent to selectively remove the first material. In this case, a porous body can be obtained by removing the core layer without performing heat treatment.

[0037] Preferably, the plastic working is wire drawing,
It includes at least one selected from the group consisting of extrusion, drawing, rolling, and forging.

Preferably, the method for producing a porous body is as follows:
The method further includes a step of obtaining a molded article of the porous body by plastically processing the porous body.

Preferably, the method for producing a porous body is as follows:
A step of cutting the multi-core wire along a direction intersecting the length direction, and further comprising a step of plastically processing the cut multi-core wire to obtain a molded product, a step of removing a plurality of core wire layers,
This is performed after obtaining a molded article.

Also preferably, the plastic working is a rolling work,
It includes at least one selected from the group consisting of press working and forging.

A method for producing a porous body according to another aspect of the present invention includes a step of filling a particle into a first pipe and then plastically processing the first pipe to obtain a single core wire. Obtaining a porous body by plastically working the second pipe after disposing the plurality of single-core wires in the second pipe.

According to the method for manufacturing a porous body having such a process, after the first pipe filled with particles is disposed in the second pipe, the second pipe is subjected to plastic working to form the porous pipe. The body is obtained. Therefore, gaps between particles in the first pipe become pores. By adjusting the degree of plastic working, the inner diameter of the first pipe can be controlled, so that the pore diameter can be accurately controlled.

Further, since the multifilamentary wire is manufactured by plastic working, the position of the pores, the absolute value of the diameter of the pores, and the variation in the diameter can be reliably controlled by adjusting the degree of working.

Further, a porous body can be manufactured without performing heat treatment. More preferably, the particles include at least one selected from the group consisting of ceramic particles, metal particles, catalyst particles, and catalyst carrier particles.

Preferably, after the step of plastically working the second pipe, the method further comprises a step of cutting the porous body along a direction intersecting the length direction. In this case, a plate-like porous body can be manufactured.

Preferably, the step of obtaining the porous body comprises:
After arranging a plurality of single-core wires in the second pipe, a step of obtaining a multi-core wire by plastically processing the second pipe, and after arranging the plurality of multi-core wires in the third pipe, Obtaining a porous body by plastically working the third pipe.

[0047] Preferably, the plastic working is wire drawing,
It includes at least one selected from the group consisting of extrusion, drawing, rolling, and forging.

Preferably, the method for producing a porous body is as follows:
The method further includes a step of obtaining a molded article of the porous body by plastically processing the porous body.

Preferably, the method for producing the porous body is as follows:
The method further comprises the step of cutting the porous body along a direction intersecting the length direction, and the step of plastically processing the porous body to obtain a molded product includes the step of cutting the porous body along a direction intersecting the length direction. This is performed after the cutting step.

Also preferably, the plastic working is a rolling work,
It includes at least one selected from the group consisting of press working and forging.

[0051]

BEST MODE FOR CARRYING OUT THE INVENTION A porous body according to the present invention is manufactured according to the following steps. A wire having a multi-core structure composed of two or more kinds of materials is drawn as plastic working, a plurality of the bundles are bundled, and further drawn as plastic working. A plurality of the cores are bundled to form a multifilamentary wire, and the multifilamentary wire is cut in a direction orthogonal to the longitudinal direction of the wire, and then the internal material of the multifilamentary wire is removed to form pores.

The porous body according to the present invention is manufactured by bundling a plurality of multifilamentary wires having pores and cutting the wires perpendicularly to the longitudinal direction.

The multifilamentary wire preferably has a metal tube on the outside and another metal or carbon particles, one or more organic resin polymers or a mixture thereof filled therein. These multifilamentary wires are drawn and thinned, and a plurality of bundles are bundled and further drawn. By repeating this step a plurality of times, the inner filament diameter becomes smaller and smaller. A plurality of filaments having a desired filament diameter are bundled, filled in another metal pipe, and extruded, drawn, cold forged or hot forged. When the pipe is cut perpendicularly to the longitudinal direction, a plate having a cross-sectional shape of an ultrafine multifilamentary wire can be formed. Thereafter, the inner filament member of the ultrafine multi-core wire is removed to produce a porous body.

When the inside is filled with a metal, the inside filament member is first dissolved by an etching solution having a different solubility from the outside metal. Thereby, a porous body can be manufactured.

Further, a porous body which is filled with carbon particles, one or more kinds of organic resin polymers or a mixture thereof can be manufactured by sintering in the air. In particular, when an organic resin polymer is filled, only the inner filament member can be removed using an organic solvent.

The diameter of the pores of the porous body thus manufactured is preferably 0.01 μm or more from the viewpoint of easy production and pressure loss. When the length of one pore is 0.1 mm, the diameter of each part of the one pore varies within a range of ± 1% of the diameter of the pore. Further, the diameter of 70% of the pores is preferably ± 10% or less of the average diameter with respect to the total number of the pores.

In another manufacturing method, a metal pipe filled with at least one of ceramic particles, metal particles, catalyst particles and catalyst-carrying particles is drawn by plastic working, and then a plurality of the bundles are bundled. Wire drawing as plastic working. After repeating this process a plurality of times, a plurality of the bundles are filled into another metal pipe, and extruded, drawn, cold forged or hot forged to form a multifilamentary wire. The multifilamentary wire is cut perpendicular to the longitudinal direction.

In this case, if any one of ceramic particles, metal particles, catalyst particles and catalyst carrier particles having a particle size smaller than the filament diameter is filled, the particles filled inside without removing the filament member are removed. Since pores are formed between them, they can be used as a porous body as they are.

In this case, the filament diameter of the porous body is 0.1 μm or more from the viewpoint of easy production and pressure loss. The particle size of the particles filled therein is not less than 0.01 μm and less than the diameter of the filament.

When the length of one filament is 0.1 mm, the diameter of each part of the filament varies within a range of ± 10% or less of the diameter of the filament. It is preferable that 70% of the filaments have a diameter of ± 20% or less of the average diameter with respect to the total number of filaments.

By filling a metal pipe with catalyst particles such as nickel particles or catalyst carrier particles having platinum supported on the surface of activated carbon to produce a similar porous body, a catalyst carrier having high catalyst efficiency can be obtained. Can be made. Further, according to the method of the present invention, since a heat treatment step is not indispensable for the step of producing the porous body, the catalyst carrier can be easily produced at low cost without deteriorating the catalyst.

The thickness of the porous body is preferably 10 mm or less in order to reduce pressure loss. After cutting, it is also possible to incorporate a step of polishing the cut surface.
In addition, since the pores of the porous body extend in almost the same direction, the strength is less reduced even when the porous body is made thin. Further, the thickness of the porous body can be set to 0.1 mm or less.

In the above-described method, a method of fitting a wire having the same outer diameter to a pipe to form a multi-core is shown. However, the present invention is not limited to this. A large wire rod may be fitted to a pipe to make it multi-core. Thereby, a porous body in which pores having a large diameter and pores having a small diameter are formed can be formed. Large diameter pores can be used, for example, as a gas flow path.

Further, the porous body of the present invention may be, for example, a catalyst carrier for a fuel cell, a manifold material, a material for separating or altering liquid or gas, a current collecting material such as a lithium battery, a DPF.
It can also be used for filters (diesel exhaust particulate removal filters), microchannels, microreactors, hydrogen permeable filters, etc.

[0065]

(Embodiment 1) FIG. 1 is a perspective view of a composite material used in Embodiment 1 of the present invention. As shown in FIG. 1, a third having an outer diameter of 10 mm, a thickness of 2 mm, and a length of 500 mm
A composite material 13 was prepared as a single core wire in which aluminum 12 was filled as a first material in a silver pipe 11 as a pipe. This composite material 13 was drawn to have an outer diameter of 1 mm, and then finished into a hexagonal column-shaped rod by drawing.

The rods were cut at every 500 mm in length and bundled, and 55 hexagonal rods were inserted into a silver pipe as a first pipe having an outer diameter of 10 mm, a thickness of 0.5 mm, and a length of 500 mm. . The silver pipe into which the hexagonal rod was inserted was drawn again, the outer diameter was reduced to 1 mm, and the rod was drawn into a hexagonal rod.

This process was repeated five times to obtain 275 (55 ×
5) After obtaining a hexagonal column-shaped rod having a filamentous aluminum, the rod was cut into pieces each having a length of 500 mm. 295 cut bars were inserted into a silver pipe having an outer diameter of 20 mm, a wall thickness of 0.5 mm, and a length of 500 mm. This pipe was hot forged to obtain 81125 (275 × 295) multifilamentary wires having filamentary aluminum.

FIG. 2 is a perspective view of the multifilamentary wire, and FIG. 3 is an enlarged view of a portion surrounded by III in FIG.
Referring to FIGS. 2 and 3, multifilamentary wire 15 includes silver pipe 14 as an outer layer, and composite material 13 filled in silver pipe 14. As shown in FIG. 3, the silver pipe 14 is filled with the composite material 13. The composite material 13 has a silver pipe 11 as an outer layer and aluminum 12 as a core layer. In FIG. 3, the composite material 13 is densely filled in the silver pipe 14, but the description of the composite material is omitted in the vicinity of the silver pipe 14.

The multifilamentary wire was cut perpendicularly to the longitudinal direction to produce a plate having a thickness of 0.5 mm. FIG.
FIG. 5 is a perspective view of the plate-like body, and FIG. 5 is an enlarged view of a portion indicated by V in FIG. Referring to FIGS. 4 and 5,
The plate 16 includes a silver pipe 14 and a composite material 13 filled in the silver pipe 14. The composite material 13 is filled in the silver pipe 14. Although the composite material 13 is densely filled in the silver pipe 14, near the silver pipe 14,
The description of the composite material is omitted.

A porous body was prepared by immersing the plate in hydrochloric acid and dissolving only the aluminum filament part. FIG. 6 is a perspective view of the porous body. FIG. 7 is an enlarged view of a portion indicated by VII in FIG. FIG.
Referring to FIG. 7 and FIG. 7, in the porous body 18, a small silver pipe 11 is fitted in a large silver pipe 14, and pores 17 are formed in the silver pipe 11. The diameter of the pores 17 was substantially uniform, and was 0.08 μm. Silver pipe 1
Although the silver pipe 11 is densely filled in the inside 4, the description of the silver pipe 11 is omitted in the vicinity of the silver pipe 14.

FIG. 8 is a diagram showing a cross section viewed along the line VIII-VIII in FIG. Referring to FIG. 8, it was observed that silver crystals 111 were oriented parallel to the length direction of pores 17 as a flow channel. That is, a plurality of crystals 1
Each of 11 extended substantially parallel to the direction in which the pores 17 extended. This is considered to be an effect of drawing.

(Examples 2 to 9)

[0073]

[Table 1]

In Examples 2 to 9, a metal pipe as a third pipe having the material shown in Table 1 was filled with a filler as a first material shown in Table 1 to obtain a composite material. "SUS316" in Table 1 refers to JIS SUS316 stainless steel. This composite material was repeatedly drawn, cut and multi-core in accordance with the same steps as in Example 1 to form a multi-core wire, and then cut to a thickness of 0.5 mm to produce a plate-like body. The removal materials and removal methods shown in Table 1 were used to remove the filler from the plate. As a result, a substantially uniform porous body having a pore diameter of 0.08 μm could be produced.

(Comparative Example 1) A sample of porous metal having a micron grade of 0.2 (meaning that particles having a diameter of 0.2 μm or more are not transmitted) and a thickness of 1 mm was prepared. In addition, a sample of a porous silicon ceramic manufactured by Sumitomo Electric Industries, having an average pore diameter of 0.2 μm and a thickness of 1 mm was prepared. Observation of the pores on the surface of these samples confirmed that pores having a diameter of 1.0 μm or more were formed.

According to the same method as in Example 1, a porous body having a pore diameter of 0.2 μm and a thickness of 1 mm was produced as a product of the present invention. Observation of the pores on the surface revealed that the pore diameter was almost uniform and was 0.2 μm or less.

When the results of pressure loss when nitrogen gas was permeated using these porous bodies were measured, the product of the present invention was compared with the porous metal and porous silicon nitride ceramic manufactured by Mott. It was found that the pressure loss was small.

Comparative Example 2 A porous body having a pore diameter of 0.5 mm and a thickness of 3 mm was produced in the same manner as in Example 1. As a comparative example, a sample of Celmet (registered trademark) made of Sumitomo Electric Industries, Ltd., having a product number of # 7 (pore diameter 0.5 mm) and a thickness of 3 mm was prepared.
In addition, a stainless steel porous body prepared by a solution coagulation method and having a pore diameter of 0.5 mm and a thickness of 3 mm was prepared. For these, the pressure loss when nitrogen gas was permeated was measured. As a result, it was found that the product of the present invention had a smaller pressure loss than the porous materials made of Celmet (registered trademark) and stainless steel.

(Embodiment 10) FIG. 9 is a perspective view of a composite material used in Embodiment 10 of the present invention. Referring to FIG. 9, a first having an outer diameter of 10 mm, a thickness of 1 mm, and a length of 500 mm
Was filled with alumina abrasive grains 22 having an average particle diameter of 0.05 μm as particles, to obtain a composite material 23 as a single core wire. This composite material 23 was repeatedly drawn, cut and multi-core in the same manner as in Example 1 to produce a multi-core wire.

FIG. 10 is a perspective view of a multi-core wire. FIG.
1 is an enlarged view of a portion indicated by XI in FIG. Referring to FIGS. 10 and 11, the multifilamentary wire 25 includes an outer silver pipe 14 as a second pipe and a silver pipe 1.
4 and a composite material 23 filled therein. Silver pipe 1
4 is densely filled with the composite material 23. In the vicinity of the silver pipe 14, the description of the composite material 23 is omitted.

The multifilamentary wire was cut perpendicular to the longitudinal direction to produce a plate having a thickness of 0.2 mm. FIG.
It is a perspective view of a plate-shaped object. FIG. 13 shows XIII in FIG.
It is a figure which expands and shows the part enclosed with. Referring to FIGS. 12 and 13, porous body 26 includes silver pipe 14, silver pipe 11 filled in silver pipe 14, and alumina abrasive grains 22 filled in a flow path in silver pipe 11. And That is, since the alumina abrasive grains were clogged in the pores of the silver pipe 11, the porous body 26 having a smaller pore diameter could be manufactured in the flow path.

(Embodiment 11) FIG. 14 is a perspective view of a composite material used in Embodiment 11 of the present invention. Referring to FIG. 14, a composite material 33 was prepared by filling platinum-carrying carbon catalyst particles 32 having an average particle diameter of 5 μm in a silver pipe 11 having an outer diameter of 20 mm, a thickness of 1 mm, and a length of 500 mm. This composite material was drawn, cut and multi-core in the same manner as in Example 1 to obtain a multi-core wire. This multifilamentary wire was cut perpendicularly to the longitudinal direction and the surface was polished to obtain a porous body having a thickness of 0.05 mm. When the diameter of the filament filled with the carbon catalyst particles supporting platinum was evaluated, the diameter was about 100 μm. When nitrogen gas was passed through this porous body, the pressure loss was small and the plate did not deform.

The porous body was obtained by cutting the multifilamentary wire so that the thickness of the porous body became 15 mm. When nitrogen gas was passed through the obtained porous body, the pressure loss was large, and the porous body was deformed by the applied nitrogen gas pressure.

(Embodiment 12) Referring to FIG.
composite material 1 as a single core wire in which aluminum 12 as a first material is filled in a silver pipe 11 as a third pipe having a thickness of 0.2 mm, a thickness of 0.2 mm, and a length of 300 mm.
3 were prepared. This composite material 13 was prepared by using an outer diameter of 200 m.
m, a billet made of a silver-copper alloy having a thickness of 10 mm was closest packed and subjected to extrusion, drawing and roll rolling as plastic working to form a rod having an outer diameter of 10 mm. This rod was drawn to an outer diameter of 1 mm, and then finished into a hexagonal column by drawing.

The rods were cut into bundles each having a length of 500 mm, and 55 hexagonal rods were inserted into a silver pipe as a first pipe having an outer diameter of 10 mm, a thickness of 0.5 mm, and a length of 500 mm. . The silver pipe into which the hexagonal rod was inserted was drawn again, the outer diameter was reduced to 1 mm, and the rod was drawn into a hexagonal rod.

The step of bundling the hexagonal rods was repeated five times to obtain hexagonal rods having filamentous aluminum, and the rods were cut into pieces each having a length of 500 mm. Cut rod into outer diameter 20mm, wall thickness 0.5mm, length 500
295 pieces were inserted into a silver pipe of mm. This pipe was hot forged to obtain a multifilamentary wire having filamentary aluminum.

The multifilamentary wire was cut perpendicular to the longitudinal direction to produce a plate having a thickness of 20 mm. The filament diameter of the plate was 0.1 μm. When the plate was rolled as plastic working until the thickness became 0.2 mm, a plate (molded product) of a multifilamentary wire having an average filament diameter of about 1 μm was obtained. This plate was immersed in an aqueous solution of caustic soda to dissolve only the aluminum filament, whereby a porous body having an average pore diameter of about 1 μm could be produced.

(Example 13) In the same manner as in Example 10, the average particle size was 0.0 μm in the pores having a pore size of 0.2 μm.
A porous body having a thickness of 15 mm and filled with 5 μm alumina abrasive grains was prepared. When this was subjected to forging as plastic working until the thickness became 0.15 μm, a porous body (molded product) having an average diameter of pores of about 2 μm and filled with alumina abrasive grains in the pores was formed. Could be produced.

(Example 14) In the same manner as in Example 1, a multifilamentary wire plate having a pore diameter of 0.05 µm and a thickness of 3.2 µm was produced. This was subjected to a rolling process as a plastic process until the thickness became 0.2 mm, whereby a multifilamentary plate-like body in which the diameter of the aluminum filament was 0.2 μm was substantially uniform. The plate-shaped body was subjected to press working as plastic working to produce a cylindrical body (molded product). FIG. 15 is a perspective view of a cylindrical body, and FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. Referring to FIG. 15 and FIG.
Is a matrix 201 made of silver and a matrix 2
01 has a filament 202 made of aluminum embedded therein. The matrix 201 is formed in a cylindrical shape having a bottom surface, that is, a cup shape. A filament 202 is provided so as to penetrate the matrix 201. The length of the cylindrical body 200 is 20 mm, and the outer diameter is 10 mm.

The tubular body 200 was immersed in an aqueous solution of potassium hydroxide to dissolve only the filaments 202 made of aluminum, whereby a tubular porous body could be produced.

Example 15 A porous body having a pore diameter of 1 μm and a thickness of 0.5 mm was produced in the same manner as in Example 1. This was subjected to rolling and press working as plastic working until the thickness became 0.3 mm. As a result, a porous body (molded product) having an average pore diameter of about 0.6 μm could be produced.

In each embodiment, the porous body may be formed into a tape by pressing, rolling, or hot or cold forging. Alternatively, the multifilamentary wire may be formed into a tape by pressing, rolling, or hot or cold forging.

The embodiments and examples disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0094]

According to the present invention, a porous body can be obtained in which the pore diameter can be precisely controlled, the pressure loss is small, and a heat treatment step is not indispensable.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite material used in Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a multi-core wire.

FIG. 3 is an enlarged view showing a part surrounded by III in FIG. 2;

FIG. 4 is a perspective view of a plate-like body.

FIG. 5 is an enlarged view of a portion surrounded by V in FIG. 4;

FIG. 6 is a perspective view of a porous body.

FIG. 7 is an enlarged view showing a portion surrounded by VII in FIG. 6;

FIG. 8 is a diagram showing a cross section viewed along line VIII-VIII in FIG. 7;

FIG. 9 is a perspective view of a composite material used in Embodiment 10 of the present invention.

FIG. 10 is a perspective view of a multi-core wire.

11 is an enlarged view showing a portion surrounded by XI in FIG. 10;

FIG. 12 is a perspective view of a plate-like body.

FIG. 13 is an enlarged view showing a portion surrounded by XIII in FIG. 12;

FIG. 14 is a perspective view of a composite material used in Embodiment 11 of the present invention.

FIG. 15 is a perspective view of a tubular body.

16 is a sectional view taken along the line XVI-XVI in FIG.

[Explanation of symbols]

11,14 silver pipe, 12 aluminum, 13,2
3,33 composite material, 15,25 multifilamentary wire, 16 plate, 17 pores, 18,26 porous material, 22 alumina abrasive grains, 32 carbon catalyst particles, 111 crystals.

Continued on the front page. (72) Inventor Taku Uemura 1-1-1, Kunyokita, Itami-shi, Hyogo Sumitomo Electric Industries, Ltd. Itami Works (72) Inventor Kentaro Yoshida 1-1-1, Kunyokita, Itami-shi, Hyogo Sumitomo Electric Industries, Ltd. Itami Works F term (reference) 4E096 EA24 HA16 HA17 4G069 AA01 AA03 AA08 AA11 AA12 BA08B BA17 BC32B BC75B CC31 EA06 EA11 EB01 FB66 FB74 FB70 FB74

Claims (33)

[Claims] 1. A porous body having a plurality of pores and containing a metal, wherein the plurality of the pores are formed to extend in substantially the same direction, wherein the metal includes a plurality of crystals, A porous body, wherein each of the plurality of crystals extends substantially parallel to a direction in which the pores extend. 2. The porous body according to claim 1, wherein said pores have a diameter of 0.01 μm or more. 3. When the length of the pores is 0.1 mm, the diameter of each of the pores varies within ± 1% of the diameter of the pores. 3. The porous body according to 1 or 2. 4. The method according to claim 1, wherein the diameter of 70% of the pores varies within ± 10% of the average diameter with respect to the total number of the pores. Porous body. 5. The porous body according to claim 1, further comprising a plurality of particles filled in the pores, wherein the diameter of the pores is 0.1 μm or more. 6. The porous body according to claim 5, wherein the diameter of the particles is 0.01 μm or more and less than the diameter of the pores. 7. When the length of the pores is 0.1 mm, the diameter at each portion of one of the pores varies within a range of ± 10% or less of the diameter of the pores. 7. The porous body according to 5 or 6. 8. The method according to claim 5, wherein the diameter of 70% of the pores varies within ± 20% of the average diameter with respect to the total number of the pores. Porous body. 9. The porous material according to claim 5, wherein the particles include at least one selected from the group consisting of ceramic particles, metal particles, catalyst particles, and catalyst carrier particles. body. 10. The porous body according to claim 2, wherein the length of the pore is substantially equal to the thickness of the porous body, and the thickness of the porous body is 10 mm or less. . 11. A flow path forming member having a plurality of flow paths and including a metal, wherein the plurality of the flow paths are formed so as to extend in substantially the same direction, and the metal includes a plurality of crystals. A flow path forming member, wherein each of the plurality of crystals extends substantially parallel to a direction in which the flow path extends. 12. A multi-core wire material comprising a plurality of core layers each including a first material and an outer layer covering the plurality of core layers and including a second material different from the first material is prepared. A method for producing a porous body, comprising: a step of obtaining a porous body by removing the plurality of core layers. 13. The method according to claim 13, further comprising the step of cutting the multi-core wire along a direction intersecting the length direction, wherein the step of removing the plurality of core layers is performed after the step of cutting the multi-core wire. The method for producing a porous body according to claim 12, which is performed. 14. The step of preparing the multi-core wire rod comprises the steps of: preparing a single-core wire rod comprising a single core layer and the outer layer covering the single core layer; After disposing a single core wire in a first pipe made of the second material, obtaining a multicore wire by plastic working the first pipe.
Or a method for producing a porous body according to item 13. 15. The step of preparing the multi-core wire includes a step of plastically working the second pipe after disposing a plurality of the multi-core wires in a second pipe made of the second material. The method for producing a porous body according to claim 14, comprising: 16. The step of preparing the single core wire comprises, after filling a metal as the first material into a third pipe,
The method of claim 1, further comprising: plastic working the third pipe.
5. The method for producing a porous body according to 4. 17. The step of preparing the single core wire comprises, after filling carbon in the third pipe as the first material,
The method of claim 1, further comprising: plastic working the third pipe.
5. The method for producing a porous body according to 4. 18. The method according to claim 14, wherein the step of preparing the single-core wire includes, after filling an organic material as the first material into a third pipe, plastically working the third pipe. A method for producing the porous body according to the above. 19. The method of removing a plurality of core layers,
17. The method for manufacturing a porous body according to claim 16, comprising etching to selectively remove the first material. 20. The step of removing the plurality of core layers,
19. The method for producing a porous body according to claim 17, further comprising heating to selectively remove the first material. 21. The step of removing the plurality of core layers,
The method for producing a porous body according to claim 18, comprising dissolving the first material in a solvent to selectively remove the first material. 22. The plastic working according to claim 14, wherein the plastic working includes at least one selected from the group consisting of wire drawing, extrusion, drawing, rolling and forging.
The method for producing a porous body according to any one of the above. 23. The method for producing a porous body according to claim 12, further comprising a step of obtaining a molded article of the porous body by plastically processing the porous body. . 24. The method according to claim 24, further comprising: cutting the multi-core wire along a direction intersecting with the length direction; and plastically processing the cut multi-core wire to obtain a molded product. The method for producing a porous body according to any one of claims 12 to 22, wherein the step of removing the core layer is performed after obtaining the molded article. 25. The method for producing a porous body according to claim 23, wherein the plastic working includes at least one selected from the group consisting of rolling, pressing, and forging. 26. After filling the particles into the first pipe,
A step of obtaining a single core wire by plastic working of the first pipe; and a step of arranging a plurality of the single core wires in a second pipe and then plastic working the second pipe. And a method for producing a porous body. 27. The method according to claim 26, wherein the particles include at least one selected from the group consisting of ceramic particles, metal particles, catalyst particles, and catalyst carrier particles. 28. The porous material according to claim 26, further comprising, after the step of plastically processing the second pipe, a step of cutting the porous body along a direction intersecting the length direction. How to make the body. 29. A step of obtaining the porous body, comprising: arranging a plurality of the single-core wires in the second pipe, and then plastically processing the second pipe to obtain a multi-core wire. The method according to any one of claims 26 to 28, further comprising: after disposing the plurality of multifilamentary wires in the third pipe, performing plastic working on the third pipe to obtain a porous body. A method for producing the porous body according to the above. 30. The porous body according to claim 26, wherein the plastic working includes at least one selected from the group consisting of wire drawing, extrusion, drawing, rolling, and forging. Manufacturing method. 31. The method for producing a porous body according to claim 26, further comprising a step of obtaining a molded article of the porous body by plastically processing the porous body. . 32. The method according to claim 32, further comprising the step of cutting the porous body along a direction intersecting the length direction, wherein the step of plastically processing the porous body to obtain a molded product includes: 32. The method for producing a porous body according to claim 31, wherein the method is performed after the step of cutting along a direction intersecting the direction. 33. The method for producing a porous body according to claim 31, wherein the plastic working includes at least one selected from the group consisting of rolling, pressing, and forging.