JP2876706B2 - Copper alloy wires for electric and electronic equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copper alloy fine wire having excellent strength, conductivity and bending characteristics, and more particularly to an electric device, a measuring device, a medical device, an information communication device and the like. The present invention relates to a highly reliable fine wire conductor and the like used in the present invention.

[Prior art] Pure copper such as tough pitch copper and oxygen-free copper has been mainly used as conductors used in electronic devices, measuring devices, medical devices, information communication devices, and the like. Copper-tin-based alloys and copper-beryllium-based alloys are used.

[Problems to be Solved by the Invention] With the recent development of the electric / electronic and telecommunication industries, required characteristics of conductors used have become more severe, and furthermore, smaller conductors have been required. It has come to be.

Under such circumstances, a conductor with high reliability in both electrical properties such as electrical conductivity and mechanical properties such as tensile properties and bending properties has been demanded.

An object of the present invention is to provide a copper alloy fine wire for electric / electronic equipment which is excellent in mechanical properties such as tensile strength and flexural properties and electrical properties such as electrical conductivity in order to satisfy such conventional needs. It is in.

[Means for Solving the Problems] The copper alloy fine wire for electric / electronic equipment according to the present invention comprises Nb,
Containing 0.01% by weight or more of each element of Si and Ti,
Further, it is characterized in that each of the above elements is contained in a total of 1.0 to 4.0% by weight, and the balance consists of Cu and unavoidable impurities.

Further, in the copper alloy thin wire for electric and electronic equipment according to the present invention, the content of each element of Nb, Si and Ti, the weight ratio Nb / Si is in the range of 1 to 12, and the weight ratio Ti / Si is
Within the range of 0.5 to 4, the object of the present invention can be more effectively achieved.

In the copper alloy thin wires for electric / electronic devices according to the present invention, even if plating with other metals, for example, Sn, Ag, Ni and Au, sufficient electrical and mechanical properties are obtained without deteriorating the properties. Can be obtained. Such plating may be performed in the final step, or may be performed in an intermediate step before wire drawing.

Furthermore, by using the copper alloy fine wires for electric / electronic devices of these inventions as a stranded wire obtained by bundling a plurality of wires, further improvement in mechanical properties can be expected.

[Function] By containing 0.01% by weight or more of each of Nb, Si and Ti, and by adding each element in a range of 1.0 to 4.0% by weight in total, the number of elements which form a solid solution in the Cu matrix is reduced. In addition, fine precipitates can be uniformly dispersed to achieve both electrical properties such as electrical conductivity and mechanical properties such as tensile properties and bending properties. In the present invention, fine precipitates are uniformly dispersed due to the interaction of Nb, Ti, and Si, and by containing them within the range specified in the present invention, such a uniform distribution state is obtained. Can be achieved. If the sum of the respective elements exceeds 4.0% by weight, the amount of elements that form a solid solution or precipitate increases, and electrical characteristics such as electrical conductivity are remarkably deteriorated. On the other hand, if the total is less than 1.0% by weight, it is difficult to obtain sufficient mechanical properties such as tensile properties and bending properties because the number of precipitated particles is reduced.

Further, the weight ratio of each element of Nb, Si and Ti is limited to a specific range because the interaction between Nb, Ti and Si is considered. Within such a range, harder and finer precipitates can be uniformly precipitated in the Cu matrix, and the mechanical properties such as tensile properties and bending properties of the obtained alloy fine wire can be further improved. By uniformly distributing finer precipitation particles, processing into an ultrafine wire is also improved, and sufficient mechanical properties can be obtained even with an ultrafine wire.

Example An alloy having the composition shown in Table 1 was semi-continuously cast using a graphite mold to obtain a rod having a diameter of 8 mm. In Table 1, the compositions of Nos. 1 to 5 shown in the examples are all in accordance with the present invention. In detail, the numbers 1, 2 and 3
Contains 0.01% by weight or more of each element of Nb, Si and Ti, and the total of the above elements is in the range of 1.0 to 4.0% by weight, and the weight ratio of each element is in accordance with the present invention. In range. On the other hand, in Examples 4 and 5,
Each element is contained in an amount of 0.01% by weight or more, and the total of the above elements is in the range of 1.0 to 4.0% by weight, but the weight ratio of each element is not considered. Further, in Table 1, the compositions of Nos. 6 to 11 shown in Comparative Examples each contain 0.01% by weight or more of each element of Nb, Si and Ti, and the total of the above elements is 1.0 to 4.0% by weight. Is out of range. By comparing the thin line obtained in the above example with the thin line obtained in the comparative example, it is possible to clarify the significance of limiting the content or the content and the content ratio of each element in the present invention. . The numbers 12, 13 and 14 shown in Table 1 in the conventional example are based on the conventional technology. The effect of the present invention can be clarified by comparing the conventional example with the embodiment.

A rod having a composition shown in Table 1 and having a diameter of 8 mm was heated and held at 940 ° C. for 3 hours, and then cooled in water. This bar is further processed in the following order in the following steps to obtain a diameter of 0.12 mm.
mm conductor was obtained.

Cold drawing 8φmm → 1.6φmm, 96% reduction in area Heat treatment 460 ℃ × 3 hours → Slow cooling Cold drawing 1.6φmm → 0.12φmm, 99.4% reduction in area Heat treatment 400 ℃ × 3 hours → Slow cooling In the example, the wire was cold drawn from a diameter of 8 mm to a diameter of 0.12 mm without performing the heat treatment in the above step.

About the obtained strand, the tensile strength and the electric conductivity were measured, and the bending test was performed. For the bending test, an apparatus as shown in FIG. 1 was used. That is, as shown in FIG. 1, a weight 2 is attached to the lower end of the conductor sample 1, and the sample 1 is passed between the wheel 3 and the wheel 4, and the upper end of the sample 1 is moved right and left as shown by imaginary lines. 90 alternately
The sample was bent at an angle, and the number of bendings until the sample was cut was measured. In this bending test, measurement was also performed on a stranded wire obtained by twisting seven strands. Wheel 3
And 4 have a diameter of 30 mm and a weight 2 of 10
0 g, and 700 g for a stranded wire.

Table 2 shows the results of the tensile strength, conductivity, and bending test of the strand, and the results of the bending test of the stranded wire. From Table 2,
It is clear that the examples have both higher conductivity and better tensile strength than the comparative examples and the conventional examples. Further, as shown in Table 2, the twisted wire has significantly improved bending characteristics.

In addition, in the copper alloy fine wire of the diameter of 0.12 mm of the example, Sn or
Ag-plated products were prepared, and tensile strength, electrical conductivity, and bending characteristics were measured. As a result, the same characteristics as those without plating were obtained.

[Effect of the Invention] As described above, the copper alloy fine wire according to the present invention is
Because mechanical properties such as tensile strength and flexural properties and electrical properties such as electrical conductivity are compatible, they are effective when used as conductors in the fields of electronic equipment, measuring equipment, medical equipment and information communication equipment. It is a target.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an apparatus for a bending test performed in an embodiment of the present invention. In the figure, 1 indicates a sample, 2 indicates a weight, and 3 and 4 indicate wheels.

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Claims (1)

(57) [Claims] 1. An element containing 0.01% by weight or more of each of Nb, Si and Ti, 1.0 to 4.0% by weight in total of each of the elements Nb, Si and Ti, with the balance being Cu and inevitable impurities. And for the content of each of the elements Nb, Si and Ti, the weight ratio
Nb / Si is in the range of 1 to 12, and the weight ratio Ti / Si is 0.5
A thin copper alloy wire for electric / electronic equipment, wherein the thickness is in the range of ~ 4.