JP2000160311A - Copper-zirconium alloy wire and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a Cu-Zr alloy wire in which the adhesion between wires is prevented at the time of subjecting a Cu-Zr alloy wire to aging treatment, jointly, its electrical conductivity is secured, and, moreover, further improvement can be attained in the points of tensile strength and elongation and to provide a method for producing it. SOLUTION: A casting material of a Cu-Zr alloy obtd. by adding 0.01 to 0.50 wt.% Zr to Cu, or an extra-fine wire obtd. by subjecting the alloy to solution heat treatment at >=950 deg.C for >=30 min and executing wire drawning into a final wire diamter or a stranded wire obtd. by stranding the extra-fine wire is subjected to electric heating under 10 to 20 V applied voltage for 0.3 to 4.0 sec to precipitate Cu-Zr compds. By this method, the Cu-Zr alloy wire of 0.02 to 0.10 mm wire diameter having >=40 kgf/mm2 tensile strength, >=5% elongation and >=80% IACS electric conductivity can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a copper alloy wire used as an ultrafine wire of an IC tester cable, an interface cable of a computer, and a wire for electronic equipment such as a digital camera. The present invention relates to a semi-hard Cu-Zr alloy wire having a tensile strength close to a material and an elongation close to an annealed material, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As electronic devices have become lighter and thinner in recent years, there has been a growing need for ultra-fine wires to be used in accordance with the lighter and thinner wires. Hard copper wire has been used for ordinary fine wire conductors. However, the hard copper wire has a problem that the wires are scattered at the time of terminal processing, so-called "separation". Therefore, replacement with a soft copper wire has been studied. On the other hand, the annealed copper wire has disadvantages such as a low flex life due to insufficient strength and a breakage during extrusion of the insulator. Therefore, there is a demand for a semi-hard material and a highly conductive ultrafine alloy wire having both the characteristics of the hard copper wire and the soft copper wire.

[0003] Such a conductive ultrafine alloy wire has a thickness of 0.0
The wire diameter is about 2 to 0.10 mm, and the alloy has Cu-
Sn alloys and Cu-Zr alloys are used. The alloy wire thus obtained is generally used as a stranded wire obtained by twisting an element wire (extremely fine wire) or as a winding conductor in which the element wire is wound around a flexible linear or belt-shaped insulator. .

When a Cu-Zr alloy wire is applied, an ultrafine wire of a Cu-Zr alloy is drawn to a predetermined size and then wound around a bobbin for the above-mentioned ultrafine wire.
By aging by heat treatment at 0 to 500 ° C. for about 2 hours, tensile strength 35 to 45 kgf / mm ² , elongation 5 to 8
% And a conductivity of about 90% IACS.

[0005]

In the case of the Cu-Zr alloy wire provided by the above-mentioned prior art, there is a problem that a part of the wire sticks at the time of heat treatment, and the wire breaks when the wire is wound in the next step. There is a problem that the surface quality is remarkably deteriorated by scratching or scratching the surface. Further, in order to obtain higher flexibility, a tensile strength of 40 kgf / mm ² or more is required, and a higher elongation is required for improving the end workability. That is, higher tensile strength and higher elongation are required than existing products in order to improve bending resistance and end workability.

Therefore, the problems to be solved by the present invention (objects)
Is a Cu-Zr alloy wire that prevents adhesion between wires during aging treatment of a Cu-Zr alloy wire, and further improves the tensile strength and elongation while securing conductivity. And a method for manufacturing the same.

[0007]

The C provided by the present invention
The u-Zr alloy wire contains 0.01 to 0.20 wt% of Z in Cu.
r, the resulting alloy wire has a tensile strength of 40
kgf / mm ² or more, elongation 5% or more, conductivity 80% IAC
S or more, the wire diameter is comprised between 0.02 and 0.10 mm.

[0008] The method of manufacturing a Cu-Zr alloy wire provided by the present invention is a method for producing a Cu-Zr alloy cast material in which 0.01 to 0.50 wt% Zr is added to Cu, or 950 of the same.
The ultra-fine wire drawn to the final wire diameter by performing a solution treatment of 30 ° C. or more and a stranded wire obtained by twisting the extra-fine wire,
The method comprises a method of depositing a Cu-Zr-based compound by applying an applied voltage of 10 to 20 V and energizing for 0.3 to 4.0 sec.

The amount of Zr added is 0.01 to 0.20.
to that the wt% is below the 0.01 wt%, it sufficiently elevated conductivity seems Cu ₃ Zr precipitation by energization heating occurs without the strength is insufficient, and the Zr 0.2
Even if it is added in excess of 0 wt%, the strength and conductivity are saturated, and rather, inclusions made of Cu ₃ Zr are increased, and it is easy to break when a fine wire is used.

The reason why the voltage applied to the material is set to 10 to 20 V is that when the voltage is lower than 10 V, the conductivity which seems to be aging does not sufficiently increase and the elongation does not recover. Due to no rise. It is considered that this is because recrystallization occurs before the precipitation and no precipitation occurs.

[0011] The time for energizing and heating the material is 0.3 to 4.0se.
When c is less than 0.3 sec, the time required for aging is too short, and when it is more than 4.0 sec, recrystallization is accelerated and precipitation nuclei such as dislocations are reduced and precipitation becomes difficult. It depends.

It is preferable that the above-mentioned energization heating comprises annealer energization heating (between electrodes: 600 mm).

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described together with comparative examples. First, 0.01-0.50wt% to Cu
The cast material of the Cu-Zr alloy to which Zr is added is subjected to a solution treatment at 950 ° C. or more for 30 minutes or more to obtain a final wire diameter of 0.08 mm.
Example 1 was manufactured by producing a Cu—Zr alloy wire of No. 1 and subjecting the Cu—Zr alloy wire to aging treatment by applying electric current for 0.7 seconds at an applied voltage of 13 V for 0.7 seconds by annealing electric current heating (600 mm between electrodes). Was. In addition, Cu wire having a wire diameter of 0.08 mm
-Annealer energized heating of Zr alloy wire (600 mm between electrodes)
Thus, Example 2 was obtained, in which an aging treatment was performed by applying current and heating at an applied voltage of 14 V for 0.7 seconds. Further, a Cu-Zr alloy wire having a wire diameter of 0.08 mm was subjected to an aging treatment by applying an electric current for 0.4 seconds at an applied voltage of 17 V by an annealing electric heating (600 mm between electrodes) to obtain Example 3. .

On the other hand, the following were manufactured as comparative examples. First, a Cu-Zr alloy wire having a wire diameter of 0.08 mm was heated by anneal current (600 mm between electrodes) at an applied voltage of 5 V for 0.7 seconds to obtain an aging treatment. In addition, Cu-Zr having a wire diameter of 0.08 mm
Comparative Example 2 was obtained in which the alloy wire was subjected to an aging treatment by applying an electric current to the alloy wire at an applied voltage of 26 V for 0.2 seconds by an annealing current applying heating (600 mm between the electrodes).

Further, a batch type heat treatment using an electric furnace which does not rely on electric heating is employed, and a Cu-
The Zr alloy wire was subjected to a heat treatment at 460 ° C. for 2 hours.

A characteristic test was performed on the above Examples 1 to 3 and Comparative Examples 1 to 3. The results were as shown in Table 1. Table 1 also shows heat treatment conditions.

[0017]

[Table 1]

As can be seen from Table 1, in Examples 1 to 3 obtained according to the present invention, tensile strength, elongation and electrical conductivity were balanced, and these were semi-hard materials and did not stick. Was.

Further, since the production can be performed by the annealing wire drawing / electric heating device as described above, the problem that the wires stick to each other can be prevented, and the rewinding step can be omitted, and the reduction of the production cost can be expected.

[0020]

According to the present invention as described above, C
A Cu-Zr alloy wire and the like, which prevent adhesion between the wire and the wire at the time of aging treatment of the u-Zr alloy wire, and further improve the tensile strength and elongation while securing the conductivity. The intended task (objective) of providing a manufacturing method can be achieved.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C22F 1/00 630 C22F 1/00 630A 630K 661 661A 682 682 686 686A 691 691Z (72) Inventor Takaaki Ichikawa Ibaraki Hitachi Cable, Ltd. Power Systems Research Laboratories 5-1-1 Hidaka-cho, Hitachi City, Japan (72) Inventor Koichi Tamura 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture, Hitachi Cable Power Systems Research Laboratory (72 ) Inventor Katsuo Sekida 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cable Co., Ltd. (72) Inventor Kenji Konishi 4-1-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture F-term in Hitachi Cable Co., Ltd. Reference) 5G301 AA08 AA24 AB02 AB05 AD01 AE10

Claims (3)

[Claims] 1. An alloy wire obtained by adding 0.01 to 0.20 wt% of Zr to Cu and having a tensile strength of 40 kgf /
mm ² or more, elongation of 5% or more, conductivity of 80% IACS or more, the wire diameter is 0.02~0.10mm, Cu-Zr alloy wire. 2. A cast material of a Cu-Zr alloy obtained by adding 0.01 to 0.50 wt% of Zr to Cu, or 950 of the same alloy.
The ultra-fine wire drawn to the final wire diameter by performing a solution treatment of 30 ° C. or more and a stranded wire obtained by twisting the extra-fine wire,
Cu-Zr-based compounds are precipitated by applying a current of 10 to 20 V for 0.3 to 4.0 sec.
Manufacturing method of alloy wire. 3. The manufacturing method according to claim 2, wherein said energization heating is an annealing energization heating.