JPH01180931A - Copper alloy wire - Google Patents

Abstract

PURPOSE:To improve the heat resistance, mechanical strength and wire drawability of the title wire rod without impairing its electric conductivity by incorporating specific amounts of Sb, Zr and Cr thereto. CONSTITUTION:Electrolytic copper having high purity is melted and subjected to deoxidizing treatment and said each element is added thereto in the state of mother alloy to obtain an alloy contg., by weight, 0.005-0.03% Sb, 0.01-0.05% Zr and 0.2-1.0% Cr and the balance consisting of Cu and inevitable impurities. The alloy is cast into a rod and is repeatedly subjected to wire drawing and annealing to provide the above wire. By this constitution, the wire rod maintaining sufficient electric conductivity and still having high tensile strength, high semi-softening temp. and excellent heat resistance, suitable elongation and excellent wire drawability and by which extra fine wire having about <=30mum wire diameter can be stably mass-manufactured can be obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a copper alloy wire used as a thin copper wire or a winding core wire for a magnetic head, and in particular, it has excellent heat resistance and mechanical strength. , wire drawability improved, wire diameter reduced to 0
．． The present invention relates to a copper alloy wire suitable as an ultrafine wire of 1 u+m or less.

[Prior Art] In the field of fine copper wire and magnetic head winding core wire (core wire for Macnet wire), etc., with the recent development of electronic equipment, ultra-fine copper wire with a wire diameter of 0.1 + + + m or less, especially Demand for ultra-fine copper wire with a wire diameter of 50 μm or less is rapidly increasing.

However, as copper wires become finer, wire breakage becomes more likely to occur during manufacture, which is why copper alloys with improved wire drawability have been proposed.
-12415).

[Problems to be Solved by the Invention] However, in cases where enamel baking is performed after wire drawing, such as core wire for Macnet wire, the above-mentioned conventional copper alloy wire material cannot be baked by mechanical heat treatment during heat treatment. The strength of the wire will decrease, making it easier to break the wire. For this reason, there was a problem in that conventional copper alloy wire rods could only be applied to wire rods where the heat treatment temperature after wire drawing was relatively low.

On the other hand, in applications such as the above-mentioned electronic devices, there is an increasing demand for copper alloy wires that have moderate elongation and excellent heat resistance and mechanical strength. Thus, it has not been possible to obtain a wire that satisfies both strength, heat resistance, and wire drawability.

Furthermore, in addition to the above-mentioned characteristics, the core wire for copper thin wire or Macnet wire must also have excellent conductivity as a basic requirement. Therefore, there is a demand for the development of a copper alloy wire that has excellent conductivity, strength, heat resistance, and wire drawability.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a copper alloy wire that has excellent heat resistance and mechanical strength without impairing conductivity, has excellent wire drawability, and can be easily made into ultra-thin wire.

[Means for Solving the Problems] The copper alloy wire according to the present invention contains 0005 to 0.03% by weight of Sb, 0.01 to 0.05% by weight of Zr, and 0.02 to 0.03% by weight of Sb.
It is characterized in that it contains Cr in an amount of 10 to 10% by weight, with the remainder being Cu and inevitable impurities.

[Function] Cu-Cr-Zr based copper alloys have been put to practical use as copper alloys with excellent heat resistance and mechanical strength. However, this Cu-Cr-Zr alloy often breaks when drawn into an ultrafine wire with a wire diameter of 50 μm or less, and therefore has poor wire drawability.

In order to improve the wire drawability of this Cu-Cr-Zr based copper alloy, the inventors of the present application have developed an ultra-fine wire with a wire diameter of 30 μm or less using a copper alloy to which various elements have been added. We repeated the wire drawing experiment.

As a result, by adding an appropriate amount of sb to a copper alloy containing appropriate amounts of Cr and Zr, the wire diameter could be increased to 30 μm.
It has been found that it is possible to stably and continuously draw ultra-fine wires down to the diameter of 100 m or less. The present invention has been made based on such knowledge.

Hereinafter, the reason for adding the components of the copper alloy wire according to the present invention and the reason for limiting the composition thereof will be explained.

First of all, sb is an element that improves the wire drawability of copper alloys. This improvement in wire drawability is due to the sb content of 0,
If it is lower than 0.005% by weight, it is insufficient. On the contrary, sb
If the content exceeds 0.03% by weight, the conductivity will drop significantly. Therefore, the sb content is set to 0.005 to 003% by weight.

Zr Zr improves the heat resistance of copper alloys. Zr content is 0.
If the amount is less than 0.1% by weight, sufficient heat resistance cannot be obtained. Conversely, when the Zr content exceeds 0.05% by weight,
In addition to significantly deteriorating wire drawability, adding a large amount of expensive Zr causes an increase in manufacturing costs. Therefore, the Zr content should be 0.01 to 0.05% by weight.

The volume Cr improves the mechanical strength of the copper alloy. If the Cr content is less than 0.2% by weight, mechanical strength will be insufficient. on the other hand,
When the Cr content exceeds 10% by weight, the conductivity decreases and the wire drawability deteriorates. Therefore, the Cr content is 0
2 to 10% by weight.

[Example] Next, Examples of the present invention will be described in comparison with Comparative Examples outside the composition range defined in the present invention. Purity or 9
9. After melting 995% by weight of electrolytic copper and deoxidizing it, each additive element of Sb, Zr or Cr was added in the form of a master alloy to form Examples 1 to 5 and the compositions shown in Table 1 below. Each alloy of Comparative Examples 1 to 7 was melted.

Each of these alloys was cast into a rod with a diameter of about 17 mm, and then wire drawing and annealing were repeated on this rod to obtain an ultrafine wire with a wire diameter of about 30 μm.

=6- Table 1 The wire drawability, strength, and other properties of the ultrafine wires of the alloys of Examples 1 to 5 and Comparative Examples 1 to 7 were determined. The results are shown in Table 2 below.

The wire drawability column in Table 2 below shows that in this wire drawing process,
When a 1 kg wire rod is drawn, the number of wire breaks is 0, and the number of wire breaks is 0. Similarly, the number of wire breaks is 1 to 3. The number of wire breaks is 1 to 3. The number of wire breaks is 4 or more. In addition, this wire drawability column is 70 μm, 50 μm, 1.40 μm, 30 μm
It is displayed based on the number of wire breaks in each wire drawing process when wire is drawn to a wire diameter of .

Table 2 also lists the electrical conductivity, tensile strength, elongation, and semi-softening temperature of the wire when drawn to a wire diameter of 30 μm. However, the unit of conductivity is %I
AC8 (value when the conductivity of pure copper annealed material is set as 100).

Table 2 As is clear from this Table 2, Comparative Example 1, 4゜6.7
has poor wire drawability, comparative examples 2 and 4 have low conductivity, comparative examples 3 and 5.7 have low strength, comparative example 2.3 has insufficient elongation, and comparative examples 3 and 5.7 have poor wire drawability. It has a low semi-softening temperature and poor heat resistance. On the other hand, each of the copper alloy wires of Examples 1 to 5 secured a conductivity of 90% lAC3 or higher,
It has high tensile strength and moderate elongation, and has a high semi-softening temperature and excellent heat resistance. Furthermore, wire breakage does not occur during each step of the wire drawing process, and it exhibits extremely excellent wire drawability. Using this method, we were able to stably draw ultra-fine wires with a wire diameter of 30 μm.

[Effect of the invention] As explained above, the copper alloy wire according to the present invention has a
, 005-003% by weight of Sb, 0.01-0.0
Since it contains 5% by weight of Zr and 0.2 to 1.0% by weight of Cr, it has high tensile strength, a high half-softening temperature, and excellent heat resistance, and has a moderate elongation. It has excellent wire processability, and even ultra-fine wires with a wire diameter of 30 μm or less can be stably drawn and mass-produced. Furthermore, this copper alloy wire has sufficient electrical conductivity.

Claims (1)

[Claims] (1) 0.005 to 0.03% by weight of Sb, 0.01
0.05% to 0.05% Zr and 0.2% to 1.0% by weight
A copper alloy wire material containing Cr, with the balance being Cu and inevitable impurities.