JPH041443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a conductor used between or within devices such as electrical or electronic devices.

(Background technology) In connection and wiring between and within devices such as electronic devices, medical devices, and audio equipment, along with the demand for smaller and lighter devices, the electric wires used are becoming thinner and more reliable. Due to these demands, the required characteristics have become increasingly strict both mechanically and electrically.

Mechanically, wires are required to not break during wiring or use, to ensure high-frequency signal transmission, and to be flexible in order to improve workability.

Conventionally, the following conductors have been used as these conductors, but each has the following drawbacks.

For example, (tin-plated) annealed copper wire lacks mechanical strength.

For example, wires made of work-hardening alloys such as Cu-Sn and Cu-Zn systems have strength, but generally have low conductivity, low efficiency for high frequency signals, and are not flexible.

For example, wires made of age-hardening alloys such as Cu-Be, Cu-Cr, and Cu-Zr have good mechanical properties if properly tempered, but processing them into fine wires is difficult due to intermediate annealing. This is difficult and requires heat treatment for refining the final size, and the characteristics tend to vary.

Copper-coated iron (steel) wire lacks reliability due to the presence of iron due to its magnetic properties, and although it is strong, it is difficult to draw into thin wire, and the iron tends to soften during processing into thin wire. At the required temperature softening, the problem of tight contact between the wires arises.

As mentioned above, conventional conductors have been unsuitable as conductors for thin electric wires called "electronic wires."

(Disclosure of the invention) The present invention has been made in view of the above circumstances, and
By appropriately combining the materials of the composite outer covering material and the core material, we aim to provide a device conductor that has high strength and flexibility, has high high-frequency signal transmission characteristics, and is easy to manufacture. be.

The present invention is a device conductor characterized by comprising a core material made of Nb or an alloy mainly composed of Nb, and a surrounding jacket material made of Cu or an alloy mainly composed of Cu.

The conductor of the present invention is a conductor used for connection, wiring, etc. between or within electrical or electronic equipment such as information equipment, communication equipment, medical equipment, audio equipment, etc., and is made of a single wire or a plurality of these wires twisted together. It is made of twisted wires, and the cross-sectional shape of the single wire may be round, oval, square, other polygons, or other irregular shapes.

In the present invention, Nb or an alloy mainly composed of Nb (hereinafter abbreviated as Nb) constituting the core material is pure Nb.
Or alloy containing 90% or more of Nb (e.g., Nb-1%
Zr, Nb-5%V alloy, etc.). Nb is non-magnetic, has high strength, and has good workability.

In addition, Cu or an alloy mainly composed of Cu (hereinafter abbreviated as Cu) constituting the outer covering material may be pure copper (e.g., tough pitch copper, oxygen-free copper, deoxidized copper, etc.) or conductive copper alloy (e.g., Cu -0.5%Cr, Cu-0.15%Ag alloy, etc.). Cu has high electrical conductivity and is extremely easy to work with.

The figure is a sectional view showing an embodiment of the present invention.

In the figure, 1 is a core material made of Nb or a Nb alloy (Nb), and 2 is a jacket material made of Cu or a Cu alloy (Cu).

When the core material and outer covering material are combined as described above, Cu
and Nb have good adhesion as a composite material, good surface reduction workability of the composite material, and easy processing into thin wires. In addition, it has high strength due to the Nb core material, and the outer sheath material
The copper has good conductivity, especially good transmission characteristics of high-frequency signals, and the surface layer is soft, making it flexible.
Hard to break.

Also, the softening temperature of Cu is about 200℃ (thin line) and that of Nb is about 1000℃, so when a composite material of both is heated to about 300℃, the core Nb does not soften, but only the outer layer Cu softens. This softens the surface layer, resulting in a more flexible and stronger conductor.

Next, although the conductor of the present invention is also used as a composite material as shown in the figure, it is often used with a plating layer of tin, solder, etc. applied to the outer periphery.

In these hot-dipped galvanizers, the conductor is typically around 200°~
Because it is immersed in a 400℃ plating bath and heated,
It is possible to omit the above-mentioned softening treatment of only the outer covering material, and it is easy to obtain a composite conductor in which only the outer covering material is softened and becomes a soft material, while the core material does not soften due to plating and remains a hard material. It will be done.

Note that the method of compounding the core material and the outer sheath material of the present invention is a method for manufacturing ordinary composite materials, such as a pipe fitting method, a copper plating method, an extrusion coating method, and a tape molding method.
Any method such as seam welding may be used.

This combination has good adhesion between the core material and outer covering material,
Since both have good surface-reducing processability such as wire drawing, complex heat treatments such as solution treatment and aging are not required, and manufacturing is easy and costs are low.

(Example) The surface of a pure Nb rod with a purity of 99.7% or higher and the inner surface of an oxygen-free copper tube were mechanically polished with a metal brush, and these were fitted and wire drawn to create a composite with an outer diameter of 8 mm and a Nb core diameter of 7 mm. A wire rod was created.

After drawing this to 3mm, heat treatment was performed at 600℃ for 1 hour to improve adhesion, and then 0.06mm
The wire was drawn to mm. At this time, the wire drawing process was easy because the combination of Nb and Cu was suitable.

A conductor according to the present invention was prepared by applying molten tin plating to a 0.06 mm wire using a molten tin bath at a bath temperature of 280°C. During plating, the Cu part of the outer covering material of the composite wire softens,
The Nb part of the core material maintained high tensile strength (130Kg/mm ² ).

The obtained tin-plated conductor is flexible and weighs 105Kg/
It had a high tensile strength of ^mm2 .

Seven of these conductors are twisted together to form a stranded wire, insulated with polyvinyl chloride, and used as a connecting wire between a VTR camera and a VTR.It is thin, light, and flexible, has high tensile strength, and can be bent repeatedly. It was a conductor that did not easily break even when exposed to heat.

(Effects of the Invention) The device conductor of the present invention configured as described above has the following effects.

(b) Since the core material is made of Nb or an alloy mainly composed of Nb, and the outer material is made of Cu or an alloy mainly composed of Cu,
Because the core material has high strength and is less likely to soften than the outer covering material,
The conductor has high strength and is hard to break, the outer sheath material is soft, so the conductor is flexible, and the outer sheath material has high conductivity, so high frequency signal transmission characteristics are good, and there is no iron, etc. No negative magnetic effects.

(b) Nb of the core material and Cu of the outer covering material have good adhesion as a composite material, and surface reduction processing is easy, and only the Cu of the outer covering material can be softened by softening treatment.
It is easy to heat the final size, and especially for products that are melt-plated, a separate softening treatment can be omitted, and complicated heat treatments such as solution treatment and aging are not required, so manufacturing is easy. , cost is low.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. 1...Core material, 2...Outer covering material.

Claims (1)

[Claims] 1. A device conductor characterized by comprising a core material made of Nb or an alloy mainly composed of Nb, and a surrounding outer covering material made of Cu or an alloy mainly composed of Cu. 2. The device conductor according to claim 1, wherein the core material is made of hard wood and the outer covering material is made of soft wood. 3. The device conductor according to claim 1 or 2, which has a plating layer made of tin or solder on the outer covering material. 4. The device conductor according to claim 3, wherein the core material and the outer covering material are made of hard wood as is and softened material by heating by immersion in a plating bath during melt-welding.