JPH07145405A - Production of porous metal coated composite wire - Google Patents

Abstract

PURPOSE:To provide a porous metal coated composite wire which is not restricted in product applications and kinds of the metals of porous metallic materials. CONSTITUTION:This process for production of the porous metal coated composite wire comprises applying a slurry 13 prepd. by mixing the metal 10 into a viscous org. solvent 11 on the outer periphery of a metallic core wire 19, then drying the metallic core wire 19 coated with the slurry 13 to dry the coating, thereby forming the porous metallic layer on the outer periphery of the metallic core wire 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous metal-coated composite wire, and more particularly to a method for producing a porous metal-coated composite wire which does not limit the use of the product and the kind of metal of the porous metal material. It relates to a manufacturing method.

[0002]

2. Description of the Related Art As a conventional method for producing a porous metal-coated composite wire, for example, there is one disclosed in Japanese Patent Publication No. 55-26174.

In the above-described manufacturing method, a method is used in which a molten metal in a foamed state is sandwiched between belts, and at the same time, reinforcing fibers serving as a core are supplied in the longitudinal direction, thereby manufacturing a long composite wire. You can do it.

On the other hand, it has been considered to reduce the weight of a transmission line by using a foam metal-coated composite wire as a twisted strand for the transmission line. Therefore, a foam metal-coated composite wire having an outer diameter of about 3 to 5 mm is required.

[0005]

However, according to the conventional method for producing a porous metal-coated composite wire, the production is limited to the production of a metal wire having a relatively large cross-sectional area that can be formed by the belt space, and the cross-sectional shape is limited. Since it has a rectangular shape, there is an inconvenience that the application range of the product is narrowed. For this reason, it is impossible to manufacture a strand required as a twisted strand for a transmission line.

Further, because of the limitation due to the relationship between the melting temperature of the metal and the reaction temperature of the foaming aid, the types of metals that can be used to produce the porous metal material are very limited mainly for aluminum materials. There is.

Therefore, an object of the present invention is to provide a method for producing a porous metal-coated composite wire, which can prevent the use of products and the kind of metal of the porous metal material from being limited.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, the present invention uses a slurry prepared by mixing a viscous organic solvent with a metal to form a metal core in order to prevent the use of the product and the metal element of the porous metal material from being limited. A method for producing a porous metal-coated composite wire in which a porous metal layer is formed on the outer circumference of the metal core wire by applying the slurry to the outer circumference of the wire and then drying and sintering the metal core wire to which the slurry has been applied. Is provided.

If hollow glass spheres such as shirasu balloon or a thermally decomposable spherical organic material is mixed with the slurry,
By reducing the content ratio of the metal powder, it becomes possible to form a lightweight and low-density porous metal layer in the drying and sintering steps.

The metal core wire is made of a conductive material (aluminum, copper).
Alternatively, a high strength material (steel wire, carbon fiber), a lightweight material (aluminum, titanium, carbon fiber) or the like can be used. Further, the size of the metal core wire is required to have an effect as a core of the applied slurry. This effect is affected by the viscosity of the slurry, but if the coating outer diameter is 50% or more, the effect of lightness is weakened, and if it is thin, the effect of fixing the slurry is insufficient and the outer diameter fluctuates or sags. .

The metal used as the porous coating material is aluminum or
In addition, Ti, which is a high melting point material having excellent corrosion resistance and strength, can also be used. It is also possible to combine copper, iron, and nickel-based metal materials with high melting points.

Hereinafter, the method for producing the porous metal-coated composite wire of the present invention will be described in detail with reference to the accompanying drawings.

[0013]

Embodiment 1 FIGS. 1 to 3 show each step in one embodiment of the present invention. First, referring to FIG. 1, in a viscous organic solvent 11 such as methylcellulose, a weight ratio of 2
0% Al powder (300 mesh or less) 10 is mixed,
Further, it is stirred by the screw 12 to obtain a slurry solution.

Next, referring to FIG. 2, the slurry solution 13 is housed in a container 14, and the Al core wire 19 having an outer diameter of 1 mm sent from the supply roll 15 is dipped in the slurry solution 13 to form the Al core wire 19. The slurry is applied to the outer periphery, and the die 18 is used to form a wire having an outer diameter of 2.5 mm.
In, the organic solvent in the slurry of the Al core wire 19 is removed by drying with hot air supplied from the direction of the arrow, and this is wound by the winding roll 16.

Finally, in FIG. 3, the composite wire 24 coated with the slurry is sent out from the supply roll 20 and at 550 ° C.
By passing through the sintering furnace 22 of
l grains are diffused and adhered to each other to have strength. At this time,
The outer diameter is reduced and the porous metal composite wire 2 has an outer diameter of 2.35 mm.
5 were produced. After that, this is cooled in the cooling tank 23 and wound by the winding roll 21, and the work of all steps is completed.

FIG. 4 shows a cross-sectional structure of the porous metal composite wire 25 manufactured by the above-described manufacturing method.
A porous metal layer 26 is formed around the core wire 19,
The foaming rate of this porous metal layer 26 was 74%.

[0017]

Example 2 As shown in the manufacturing flow of FIG. 5, as the slurry solution 13, a mixture of hollow glass spheres was used. That is, 50% of glass spheres having an average particle size of 0.2 mm in outer diameter are mixed with an organic solvent (such as cellulose), and further Al
Powders (300 mesh or less) are mixed, and then, in Example 1
Manufactured in the same manner as. The porous metal composite wire produced in Example 2 has an outer diameter of 2.45 mm and a small reduction amount,
Moreover, the foaming rate was 80% or more.

[0018]

Example 3 As shown in the manufacturing flow of FIG. 6, as the slurry solution 13, a mixture of thermally decomposable organic material spheres was used. That is, the heat-decomposable organic material spheres having an average particle diameter of 0.1 mm are used in an organic solvent (cellulose etc.)
The mixture was mixed with 0% and further with Al powder (300 mesh or less), and thereafter, the same production as in Example 1 was performed. In the porous metal composite wire manufactured according to Example 3, the outer diameter is 2.47 mm, the reduction amount is small, and the density is 10%.
It became%. Although the density was almost the same as that of Example 2, the characteristics such that the grains became finer, the mechanical characteristics were stable, and the bending radius could be made smaller were obtained.

[0019]

As described above, according to the method for producing a porous metal-coated composite wire of the present invention, a slurry in which a metal is mixed with a viscous organic solvent is applied to the outer periphery of a metal core wire, and then the slurry is applied. Since a porous metal layer is formed on the outer periphery of the metal core wire by drying and sintering the metal core wire, there is no restriction on the product application and the kind of metal of the porous metal material. You can

[Brief description of drawings]

FIG. 1 is an explanatory view showing a step of an example of the present invention.

FIG. 2 is an explanatory view showing a process of one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a step of an example of the present invention.

FIG. 4 is a cross-sectional view showing a porous metal-coated composite wire obtained according to an example.

FIG. 5 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a third embodiment of the present invention.

[Explanation of symbols]

10 Al powder 11
Organic solvent 12 Screw 13
Slurry solution 14 Container 15
Supply roll 16 Winding roll 17
Drying furnace 18 Dice 19
Al core wire 20 Supply roll 21
Take-up roll 22 Drying furnace 23
Cooling tank 24 Composite wire 25
Porous metal composite wire 26 Porous metal layer

Claims (5)

[Claims] 1. An outer periphery of the metal core wire is obtained by applying a slurry prepared by mixing a viscous organic solvent with a metal to the outer circumference of the metal core wire, and drying and sintering the metal core wire coated with the slurry. A method for producing a porous metal-coated composite wire, which comprises forming a porous metal layer on the substrate. 2. The method for producing a porous metal-coated composite wire according to claim 1, wherein the slurry is mixed with hollow glass spheres such as shirasu balloon. 3. The method for producing a porous metal-coated composite wire according to claim 1, wherein the slurry is mixed with heat-decomposable organic material spheres. 4. The method for producing a porous metal-coated composite wire according to claim 1, wherein the metal is made of a high melting point material. 5. The metal is made of a lightweight material.
A method for producing a porous metal-coated composite wire according to claim 1.