JP2786953B2 - Porous metal body and method for producing porous metal body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous metal body and a method for producing the same, and more particularly, to a three-dimensional reticulated foam such as a polyurethane sponge used for an electrode plate of a battery, a nonwoven fabric, a lath shape and a punch shape. Sheet metal porous body made of metal mesh, resin net, non-woven fabric and net made of glass fiber, non-woven fabric and net made of carbon fiber, etc. And a method for producing a porous metal body.

[0002]

2. Description of the Related Art When a porous body having a high porosity (for example, 80% or more) is subjected to a plating treatment to produce a porous metal body, the porous body is formed into a hole in comparison with a case where a general plate is plated. Since it is necessary to uniformly electrodeposit and coat a metal, a high technology is required.

[0003] That is, the plating rate is proportional to the product of the current density and the current efficiency.
It is small in the inner layer. That is, a large amount of electrodeposited metal ions is consumed in the surface layer portion, and a deficiency state of the metal ion occurs in the porous inner layer portion, so that the inner layer is not electrodeposited, and the plating tends to be uneven. Further, in plating a non-conductive porous body, if the specific resistance of the surface conductive treatment layer of the porous body is large, the voltage drop at the electrode becomes excessive, the cell voltage rises, and it is necessary to suppress the current density. For this reason,
Only about one-tenth to one-hundredth of the current density normally used for plating a general plate or the like can be used.

In addition, it is more difficult to continuously produce such a sheet made of a porous metal material. Conventionally, there are many steps which take a batch-like process, and even if the sheet is continuously treated, various processes are required. In many cases, only fixed-size products can be manufactured due to the above conditions.

As a method for solving the above-mentioned technical problem, a method disclosed in Japanese Patent Publication No. 57-39317 has been provided. The above method comprises moving the porous body from the first plating bath to the second plating bath, and bringing the porous body into close contact with a rotating roll or an annular power supply metal sheet in the plating bath of the first bath. Is used as a cathode, electroplating is performed on the surface of the skeleton of the porous body to 0.1 to several microns, and then the porous body is used as a cathode in a second tank to a predetermined thickness on both surfaces of the porous body. Has been given.

[0006]

In the above-mentioned conventional method, first, the plating thickness of the secondary conductive treatment layer in the first tank is only about 0.1 to several microns. In the process in the two tanks, the strength was not stable enough to be able to be plated without a support. Therefore, the porous material that was fed to the second tank and was plated was wavy or curved in the second bath. As a result, it is difficult to determine the distance between the poles, which causes uneven plating thickness on both sides and local unevenness.

Further, after the secondary conductive treatment in the first tank is performed at a low current density (several A / dm ² ), the high current density (1
0A / dm ² ), there is a difference between the grain size of the plated metal plated at low current density and the grain size of the plated metal plated at high current density, causing distortion at grain boundaries. The strength of the body is also weak, and the shape becomes unstable, which results in the unevenness of the plating thickness on both surfaces in the second tank and the local unevenness.

Further, since ions always flow from the anode side to the cathode side and are plated, in the plating method in the first tank,
There is a difference in the supply of metal ions between the surface layer and the inner layer of the porous body, and even if the liquid collides with the porous body considerably strongly depending on the flow rate, the liquid hits the cathode and rebounds and does not penetrate the porous body. The lower the inner layer, the worse the electrodeposition rate on the inner surface of the hole, and the opposite side of the plating thickness on the side that is in close contact with the roll and the feeding metal sheet
The plating thickness is different from that on the (non-contact side), which further promotes nonuniform plating thickness and local nonuniformity.

As described above, in the conventional method for continuously producing a porous metal body, various methods such as uneven plating thickness on the surface of the porous body, poor electrodeposition rate on the inner surface of the hole, and insufficient strength are provided. The problem has not been solved, and therefore, it is almost impossible to wind the sheet-shaped metal porous body formed by applying the plating treatment into a coil or the like at the final stage of the treatment process for the following reasons. Has become.

That is, it is inevitable that a certain amount of tension is applied to the porous body which is the base material. When the tension is applied, the deformation of the base material is promoted, and the deformation is caused by the secondary conductive treatment or the treatment after the next process. Becomes even larger. In particular, when deformation and distortion occur in the shape after the secondary conductive treatment, as described above, the distance between the poles is not stable in the next plating step,
Non-uniformity or partial non-uniformity of the amount of electrodeposition on both sides of the porous sheet will occur, and if tension is applied to the base material to wind up the coil, non-uniform plating thickness will be further promoted. .

As described above, when a difference in plating thickness on both surfaces of the porous metal sheet and a local nonuniformity, that is, a difference in the degree of supply of metal ions occur, the strength of the plated metal grain boundary due to the variation in current density can be reduced. Inviting, when winding in a coil shape, it can be curved only in one direction with a large curvature, and if it is curved in a small curvature and in the opposite direction, cracks are likely to occur. In addition, if the sheet shape is deformed and the surface is not flat, it cannot be wound into a coil shape, and even if wound into a coil shape, it does not become a product in terms of quality.

For the above reasons, it has not been possible to wind a sheet-like porous metal body into a coil shape. However, when a desired product, for example, an electrode mat plate is formed by using a sheet-like porous metal body, it is strongly desired that the product be supplied in a continuous state wound in a coil shape.

[0013] The present invention has been made to meet the above-mentioned demands, and by using a completely new plating method,
It is an object of the present invention to provide a sheet-shaped porous metal body wound in a coil shape.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a continuous sheet of any one of a three-dimensional mesh foam, a nonwoven fabric, a mesh made of a plurality of resin nets or a mesh made of a plurality of metal nets. The present invention provides a metal porous body characterized in that a metal plating layer is provided with a uniform thickness on the entire surface of a three-dimensional hole in both the surface layer portion and the inner layer portion of the porous body.

Furthermore, the present invention provides a sheet-like porous body having three-dimensional holes which is transported transversely while keeping the plating tank horizontal, and in which plating solution is applied to a horizontal plane of the sheet-like porous body. Forced to flow with a flow velocity so as to hit it from above in the vertical direction substantially at a right angle, with a high current density and a uniform thickness over the entire surface of the three-dimensional holes on both sides of the porous body and the inner layer. After plating, and continuously winding into a roll to form a coil, the sheet-shaped porous body is burned off by performing de-sooting and sintering to form a metal porous body having three-dimensional holes. The present invention provides a method for producing a characteristic porous metal body.

In the coiled metal porous body manufactured by the above-described manufacturing method, a plating solution supply nozzle for supplying a plating solution from above to below is provided in a plating tank, and a plating solution storage tank is provided below. The plating solution storage tank and the plating solution supply nozzle are communicated with each other via a forced feed pump, and a sheet-like porous body to be plated is passed through the plating tank at a position below the plating solution supply nozzle. And a power supply in contact with the sheet-like porous body outside the tank on the introduction side to the plating tank, and a conductor roll having the porous body as a cathode is installed, while an anode ball is placed in the plating tank. A metal with a configuration in which a filled case is installed and a plating solution in contact with the above-mentioned anode ball is forcibly flowed so as to strike from a substantially perpendicular direction to a continuous sheet-like porous body moving in the plating tank. The holes of the continuous production device, it is preferable to produce.

[0017] In addition, by the above-described apparatus, an unplated porous body, which has not been plated, is placed on a plated porous body having a required strength by plating once or more. It is moved transversely in the plating tank, and at that time, the plated porous body is moved while applying tension, and the plated porous body has almost zero tension free.
The plating solution is forcibly flown on the two porous bodies in the plating tank at a flow rate such that the plating solution is blown from the unplated porous body side in a vertical direction substantially perpendicular to the horizontal plane in the plating tank. It is preferable that the entire surface of the hole in both the surface layer portion and the inner layer portion of the unplated porous body and the plated porous body be plated with a uniform thickness, and then continuously wound around a roll to form a coil.

[0018]

As described above, according to the present invention, when the inside of the plating tank is moved to the entire surface of the pores of both the surface layer portion and the inner layer portion of the sheet-like porous body after the conductivity-imparting treatment, it is substantially perpendicular to the perpendicular direction. Since plating treatment at a high current density is performed by forcibly flowing the plating solution so as to hit the plating solution, plating of a uniform thickness is given to the entire surface of the porous body, and the shape change of the porous body is suppressed. Flatness can be maintained. Therefore, the plated metal porous body can be wound into a coil having no problem in terms of quality, that is, a coiled metal porous body can be provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 shows a plating apparatus suitable for producing a coiled metal porous body according to the present invention.

In FIG. 1, 1 is a plating tank, 2 is a plating solution supply nozzle arranged in the tank from above the plating tank 1, 3 and 4 are a pair of anode cases installed vertically in the plating tank 1,
5 is an anode round ball filled in the anode cases 3 and 4; 6 is a plating solution storage tank disposed below the plating tank 1;
Is a conduit for circulating the plating solution from the plating solution storage tank 6 to the plating solution supply nozzle 2, 8 is a plating solution forcible feed pump interposed in the conduit 7, 9A and 9B, 9C and 9D are pumps for the plating tank 1. It is a pair of upper and lower cathode conductor rolls respectively arranged on the introduction side and the exit side of the plated material.

The plating tank 1 has a rectangular cross section and has an upper portion 1a having an upper end opening and a lower portion 1c which tapers toward a lower center opening 1b. An introduction hole 1d and an outlet hole 1e are formed in the wall portion, and the unplated porous body 10 and the plated porous body 1 described later are formed.
In the state of being stacked with the first through-hole 1, it is moved in the direction of the arrow so as to pass through the plating tank 1 through the introduction hole 1d and to be taken out through the lead-out hole 1e. Note that the shape of the plating tank 1 is not limited to the above shape.

Conductor rolls 9A and 9B, 9C and 9D, which are respectively disposed outside the liquid tanks of the inlet hole 1d and the outlet hole 1e, are connected to a cathode, and a sheet-shaped unplated porous material is interposed between each pair of upper and lower conductor rolls. The body 10 and the pre-plated porous body 11 are sandwiched and passed, and at the time of the passage, power is supplied by being in close contact with the upper and lower surfaces thereof.
1 is a cathode.

As described above, the present apparatus employs a system in which power is supplied by the extra-liquid conductor rolls 9A to 9D.
This is because, for example, in order to supply power in the solution in the plating tank 1, when power is supplied through the electrode rod 20 or the electrode plate 21 shown by a dashed line in FIG. 1, plating is concentrated on the electrode rod or the electrode plate. Because the diameter etc. becomes large and it becomes unusable,
In particular, in the case of a plate, plating cannot adhere to the inside of the porous body because the liquid cannot flow from the upper portion and the ions cannot be supplied.
Therefore, as described above, power is supplied by the conductor rolls 9A to 9D arranged outside the plating tank 1.

In the plating tank 1, the porous bodies 10, 11
A pair of upper and lower anode cases 3 and 4 are provided so as to sandwich the whole of the passing position. As shown in FIG. 2, these anode cases 3 and 4 have a bottom surface 3a, 4a in a lath mesh shape, and outer frame portions 3b, 4b are detachably attached to the plating tank 1. Each of the anode cases 3 and 4 is filled with a round ball 5 connected to the anode side and serving as an anode.

The member used as the anode is not limited to the round ball 5, but may be a plate, a square, or the like as long as it allows the plating solution to pass through and impinge the solution on the porous body from a substantially perpendicular direction. These can be also used, but these are more difficult to drip than round balls, and round balls are preferable from the viewpoint of ion supply efficiency and the like.

In the plating tank 1, plating solution supply nozzles 2 branched from a main supply pipe 12 disposed above the plating solution supply pipes 2 are vertically installed, and the lower side of each nozzle 2 penetrates into the upper anode case 3. The lower end injection port 2a is fitted and positioned in a hole formed in the anode case bottom surface 3a. As described above, the upper surface side porous body 1 of the stacked porous bodies 10 and 11
0 is located near the surface of the nozzle 2a.
The plating solution is directly sprayed onto the unplated porous body 10 in a direction substantially perpendicular to a position near the plating solution. A plating solution suction pipe 13 attached to the lower anode case 4 is attached at a lower position opposite to the plating solution supply nozzle 2 with the porous bodies 10 and 11 interposed therebetween.

In FIG. 1, the plurality of nozzles 2
Although four pieces are installed at intervals in the moving direction of the porous body to be plated, predetermined intervals are also provided in the front-rear direction (direction perpendicular to the moving direction) according to the width of the porous bodies 10 and 11. The plating solution sprayed from the nozzle 2 is set so as to cover the entire area of the porous bodies 10 and 11. The inner diameter of these nozzles 2 is preferably 0.3 to 5 cm,
In particular, about 1 cm is optimal. When the nozzle has an inner diameter of 1 cm, it spreads out from the outer periphery in a range of 10 cm when injected from the injection port. Therefore, when the inner diameter of the nozzle is 1 cm, the length L of the plating tank 1 is (10 + 1 + 10) × 4 = 84.
cm in length.

The configuration and the number of the nozzles 2 are not limited to those in the above embodiment. For example, the lower end injection port of the plating solution supply nozzle 2 is positioned above the upper anode case, and the plating solution is After passing through the inside of the anode round ball 5, the porous body to be plated may be sprayed.

Each of the nozzles 2 has a plating solution storage tank 6.
The plating solution is supplied by the forced feed pump 8 through the supply pipe 7, and the plating solution injected in the plating tank 1 is collected in the plating solution storage tank 6 from the lower end opening 1 b, and is continuously driven by the forced feed pump. The solution is circulated by flowing down the plating tank 1 from above to below at a predetermined flow rate. The flow rate of the plating solution can be used in the range of 50 to 300 m / min, and particularly preferably 100 to 200 m / min.

Further, in the present plating apparatus, in order to prevent the liquid from leaking from the inlet and outlet of the porous body to be plated in the plating tank 1, the liquid seals 15A and 15A are provided on the inlet 1d and the outlet 1e.
15B, and a plating solution receiver 16 below the conductor rolls 9B and 9D outside these liquid seals.
A, 16B are installed.

First, a plating method using the plating apparatus having the above configuration will be described below. As a continuous sheet-shaped porous body to be plated, it has a three-dimensional reticulated foam (for example, polyurethane sponge, etc.) in which holes communicate with each other, a fiber nonwoven, a paper nonwoven, a glass fiber nonwoven and a carbon fiber nonwoven, and independent holes. Lath, punch and other metal nets, as well as lath and punch and other resin nets, glass fiber nets and carbon fiber nets can be used.

Although the thickness of the above-mentioned porous body is not limited,
The range is preferably 0.8 to 2.0 mm, and the pore size of the porous body is 50 mm.
A range of ~ 600μ is possible, but 200 ~ 30μ
Those having a range of 0μ are preferred. In the mesh, 2-2
00 mesh and wire diameter of 0.02 to 1.00 mm can be applied.

As described above, the above-mentioned sheet-like porous body is easily deformed. In particular, the sheet thickness is small, and when the tension is applied for movement or winding, the sheet is very likely to be deformed. If plating is performed in a state where deformation has occurred, problems such as uneven plating thickness will occur. Therefore, when plating these sheet-like porous bodies, it is necessary to move them in a free state and stably without applying tension.

When the sheet-like porous body is plated by the apparatus shown in FIG. 1, the plated porous body 11 which has been given a certain strength by plating with the present apparatus is used as a support. The unplated porous body 10 which is arranged on the lower side and has no strength because it has not yet been plated is placed on the plated porous body 11,
The two sheets are continuously moved in the direction of the arrow in a stacked state.

The entire surface of the unplated porous body 10 and the plated porous body 11 has already been imparted with conductivity by a later-described conductivity imparting device before being conveyed to the conductor rolls 9A and 9B. At this time, the plated porous body 11
May be omitted, but the unplated porous body 1 may be omitted.
0 may not provide favorable conductivity due to the influence of a binder or the like contained in the base material even when the material itself is a conductive substance. Is preferred.

The conductivity imparting treatment is carried out by using a conductive material comprising carbon such as graphite and carbon black, conductive resin such as polyacetylene, polyaniline, polypyrrole, polythiophene and polyparaphenylene, metal powder or an arbitrary mixture thereof. The conductivity may be imparted by coating or impregnating these. Alternatively, a method of chemically depositing and depositing a metal on the surface of a base material, such as so-called electroless plating, may be used, and conductivity is previously provided by an arbitrary method.

The unplated porous body 10 and the plated porous body 11 provided with the above-mentioned conductivity come into contact with each other when passing between the conductor rolls 9A and 9B and become a cathode. In this state, it is introduced into the plating tank 1 and the plating tank 1
In the inside, the plating solution in contact with the round ball of the anode collides with the horizontal porous bodies 10 and 11 of the cathode from above in the vertical direction perpendicular to the horizontal direction, and penetrates through the holes of the porous bodies 10 and 11 and has a predetermined flow rate. Is forcibly washed away. Therefore, the metal ions are uniformly supplied to both the surface layer portion and the inner layer portion of each of the porous bodies 10 and 11, and are uniformly deposited and deposited, that is, electrodeposited on each portion. Metals that can be deposited include all metals that can normally be electroplated, such as Cu, Ni, Cr, Cd, Z
n, Sn, Pd, Co, Pb, Fe, etc. can be electrodeposited.

In the above-described plating step, the surface layer portion and the inner layer portion on both sides of the unplated porous body 10 and the plated porous body 11
Each surface of the surface layer portion and the inner layer portion is plated with a uniform thickness. Therefore, if the plated porous body 11 is already plated once by the present apparatus, the plating thickness of the plated porous body 11 becomes twice the thickness of the unplated porous body 10. Therefore, 2
If the plating thickness of the pre-plated porous body obtained by performing the round plating is a required thickness, the unplated porous body 10 is plated once, and then plated twice using the pre-plated porous body 11. A porous metal body having a required plating thickness is manufactured.

In the above-mentioned plating step, since the unplated porous body 10 is put on and adhered to the plated porous body 11, power is supplied to the unplated porous body 10 and the unplated porous body 10 The electrodeposition rate can be increased. In addition, by forcibly flowing the plating solution from the side of the unplated porous body 10, particularly when the flow rate is increased, the current efficiency is improved and the unplated porous body 10 is plated at a high current density. In this way, it is possible to plate an unplated porous body at a high current density from the first time, and by plating at a high current density, the plating particle size (grain size of the electrodeposited metal)
Is very fine, so that plating having high grain boundary strength and excellent adhesion can be applied from the first time. In the present invention method, the current density can be selected in a wide range of 10~600A / dm ^2, particularly preferably 100~400A / dm ^2.

Further, with the plated porous body 11 already having a certain degree of strength by plating as a support, and the unplated porous body 10 placed thereon, the plated porous body 11 is moved under tension. As a result, the plating process can be continuously performed in a free state without applying tension to the unplated porous body 10 and while moving it stably. Therefore, it is possible to prevent unevenness of the plating thickness and deformation of the shape, which occur when plating is performed in a state where tension is applied, that is, the sheet can be prevented from waving or curving.

Incidentally, it is also possible to increase the plating thickness by passing only the pre-plated porous body 11 in the plating tank 1, and this plating thickness is in the range of 1 to 700 μm, preferably in the range of 3 to 100 μm. Can be controlled.

When the above-mentioned plating method is used, the sheet-like porous body is plated with a uniform thickness on both side surface portions and the inner layer portion of the porous body. Is wound in a coil shape on a roll core or the like, no directionality is generated, and no crack occurs even when wound with a small curvature. In addition, since the sheet shape is maintained in a flat state without being deformed, it can be manufactured as a coil-wound product from the viewpoint of quality.

Next, an apparatus for continuously manufacturing a coiled metal porous body in which the plating apparatus shown in FIG. 1 is continuously arranged and a method for manufacturing the coiled metal porous body using the apparatus will be described with reference to FIG.
This will be described with reference to FIG.

In the figure, reference numeral 100 denotes an unplated porous body 10 (ie,
Unwinding coil 101 wound around a porous body as a base material), 101
Is a take-up coil formed by winding a metal porous body unwound from the unwinding coil 100 and subjected to five steps of plating to form a plated porous body 11, which is then used as a support. Things. 102 is the unwinding coil 10
This is a coiled metal porous body that is unwound from 1 and subjected to 5 steps of plating, and then wound up into a coil to obtain a product.

Reference numeral 50 denotes a conductivity-imparting treatment apparatus; 51, a hot-air drying apparatus; 52, a joining roll; 53A to 53E, first to fifth-stage plating apparatuses each having the structure shown in FIG. This is an apparatus, and the same members as those in FIG. Although details of the inside of the plating tank 1 are omitted in FIG. 3, the nozzle 2, the anode cases 3, 4 and the anode round ball 5 and the like are loaded similarly to FIG.

A method for continuously producing a coiled metal porous body using the above apparatus will be described. In this embodiment, the thickness is 1.5 mm and the width is 3
Coiled N-plated, 50 mm thick, made of foamed polyurethane having a base diameter of 00 mm and an average pore diameter of 300 μm.
i manufactures porous body.

The foamed polyurethane which is continuously unwound from the unwinding coil 100, that is, the unplated porous body 10 is transported in the direction shown by the arrow Z, and firstly, until it reaches the conductivity imparting device 50, although not shown. , With the equipment installed in sequence
After being degreased by weak alkaline washing, washed with water, neutralized, washed with water and dried in this order, and conveyed to the conductivity imparting device 50. In the conductivity imparting device 50, a mixture 42 of carbon and a conductive resin is applied. The three-dimensional network resin skeleton coated with the conductive resin is as shown in FIG. 4, and FIG. 5 is an enlarged view thereof. When the mixture of carbon and conductive resin is applied, unlike the case where carbon or metal powder is applied and impregnated, the conductive resin 41 is filled in the gap such as carbon 40 as shown in FIG. In the case of first plating, the resistance is small and the throwing power can be improved.

The unplated porous body 10 provided with conductivity by the conductivity providing device 50 is dried by a hot air drying device 51. At this time, the thickness of the conductive material is about 5 to 20 μm before drying, and about 1 to 7 μm after drying. The non-plated porous body 1 thus dried after being provided with conductivity.
0 is vertically adjusted by the aligning roll 52 with the plated porous body 11 unwound from the unwinding coil 101. That is,
The unplated porous body 10 is mounted on the plated porous body 11 which has been plated five times and has a required strength.

As described above, in the state where the unplated porous body is stacked on the plated porous body 11, the first
From the first stage to the fifth stage, the plating tanks 1 are sequentially conveyed, and Ni plating is performed five times by the five plating tanks 1. At that time, after the conductivity-imparting treatment, conventionally, low-current-density strike plating is performed, and then high-current-density main plating is performed. Immediately thereafter, main plating is performed at a high current density, and the main plating is performed five times by passing through five plating tanks arranged in parallel.

In the present embodiment, a plating thickness of 5 μm is obtained by one plating process.
The plating thickness after plating is 25 μm.
After plating is performed in the final plating tank 1 of the fifth stage, it is washed with a water washing device (not shown), then dried with a hot air drying device 54, wound up on a roll 105, and wound up by a winding coil 101. And

The winding tension for winding the sheet-like porous body around the roll 105 is very small. When the sheet-like porous body passes through the first to fifth plating tanks, the sheet-like porous body has almost zero tension. It is a state of. Therefore, the sheet-like porous body is supported and moved on the plated porous body 11 without being deformed by the winding tension.

The winding coil 101 obtained by the above steps
Is used as an unwinding coil of the plated porous body 11 as shown by a dotted arrow in the figure. That is, as the support of the unplated porous body 10, the unplated porous body 10 is
The first to fifth stage plating apparatus 5
Replate by passing through 3A-53E. After passing through the plating process five times as the support, the plating thickness of the Ni porous body coming out of the fifth stage plating apparatus 53E is 50 μm.
It has become.

Although not shown, the re-plated porous body is washed with water and then dried by a hot air drier 54. After the drying, a wound coil-shaped Ni porous body 102 is formed. This is heated in an atmosphere heated to about 600 ° C. by a de-mediating device (not shown) to thermally decompose and remove the resin skeleton. The temperature of the de-mediation step is in the range of 400 to 700 ° C.
The range of 0-650 ° C is most preferred. Subsequently, sintering and reduction are performed at about 1000 ° C. in a reducing atmosphere. The sintering temperature can be used in the range of 700 to 1100 ° C, but is preferably in the range of 1000 to 1100 ° C. Since the sintering step also performs strain relief annealing of the electrodeposited layer, a flexible and tough Ni porous body can be manufactured.

The above embodiment is an embodiment in which Ni-plating is performed using foamed polyurethane, which is a three-dimensional network foam, as a base material. Other sheet-like porous bodies are similarly manufactured as coil-like metal porous bodies. I can do it.

In the above embodiment, until the main plating is performed in the plating tank 1, the porous body as a base material is sequentially washed with alkali, washed with water, neutralized, washed with water, dried, provided with conductivity, and dried. In place of these steps, an adhesive is applied to the base material, Ni powder is sprayed to impart conductivity, and then the main plating is performed at a high current density in the plating tank 1. You may. Further, after the Ni powder electrostatic coating or the Ni powder impregnation, drying may be performed, and the main plating may be performed in the plating tank 1.

[0056]

As is apparent from the above description, in the present invention, after the conductivity imparting treatment, the main plating is immediately performed at a high current density without going through a strike plating process at a low current density. The grain size of the electrodeposited metal is extremely fine, and the plating with high grain boundary strength and excellent adhesion is applied, and metal plating with a uniform thickness on both sides of the sheet-like porous body and on the inner surface of the inner layer hole Can be performed, and deformation on a plane that is wavy or curved can also be suppressed. In this way, a uniform plating thickness can be obtained, and since the shape is not deformed, the porous metal body is wound into a coil shape,
The coiled metal porous body can be manufactured as a product.

The above-mentioned coiled metal porous body is excellent in practicality because a continuous metal porous body can be unwound from a coil and cut to a required length for use. And,
Providing such a porous metal body in a coil shape excellent in quality is of course very effective in practice, as a matter of course, because the coil shape makes it easy to store and transport.

[Brief description of the drawings]

FIG. 1 is a sectional view of a plating apparatus used in an apparatus for manufacturing a coiled metal porous body according to the present invention.

FIG. 2 is a bottom view showing a bottom shape of an anode case of the apparatus of FIG. 1;

FIG. 3 is a schematic view illustrating a manufacturing process of a coiled metal porous body.

FIG. 4 is a drawing showing a three-dimensional network resin skeleton coated with a conductive substance.

FIG. 5 is a partially enlarged view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plating tank 2 Plating solution supply nozzle 3, 4 Anode case 5 Anode round ball 6 Plating solution storage tank 7 Conduit 8 Plating solution forced feed pump 9A-9D Conductor roll 10 Unplated porous body 11 Pre-plated porous body

Claims (2)

(57) [Claims] 1. An unplated sheet-like porous body having a three-dimensional hole and having been subjected to a conductive treatment is transported transversely while keeping a plating tank in a horizontal state, and a plating solution is passed through the sheet-like porous body in the plating tank. Forced to flow with a flow velocity so as to hit it from above in the vertical direction substantially perpendicular to the horizontal plane of the horizontal plane, and at a high current density, the entire surface of the three-dimensional hole in the surface layer and the inner layer on both sides of the porous sheet After plating in a uniform thickness, the plated sheet is repeatedly conveyed in the plating bath, a plating layer of a required thickness is formed, and then continuously wound into a roll to form a coil. A method for producing a porous metal body, comprising: removing the soot and sintering to burn off the sheet-like porous body to form a metal porous body having three-dimensional holes. 2. It is manufactured by the manufacturing method according to claim 1,
A metal plating layer having a uniform thickness is formed on the entire surface of the three-dimensional holes in both the surface layer portion and the inner layer portion of the sheet-like porous body made of a nonwoven fabric, a plurality of resin nets or a mesh made of a plurality of metal nets. A porous metal body comprising: