JPS6164834A - Copper alloy having high strength, heat resistance and electric conductivity - Google Patents

Abstract

PURPOSE:To obtain a copper alloy capable of keeping good electric conductivity and having superior heat resistance as well as repeated bending and tensile strength by incorporating specific proportion of Fe, P and Sn to copper. CONSTITUTION:A copper alloy consisting of, by weight, 0.02-1% Fe, 15-80% P (based on the Fe content), 0.01-0.5% Sn, and the balance copper is manufactured. The copper alloy suitably used for the conductor of cables for an industrial robot as well as of electric wires within an electronic equipment can be thus obtained.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a heat-resistant, high-strength, high-conductivity copper alloy, and more specifically, to a heat-resistant, high-strength, high-conductivity copper alloy suitable for use as a conductor for wiring in electronic equipment or as a conductor for cables for industrial robots. Regarding copper alloys.

<Prior Art> In general, conductors for wiring in electronic devices, such as connection conductors between printed circuit boards or between printed circuit boards and electronic device components, are repeatedly bent and stretched during the manufacturing process of electronic devices.

However, in recent years, electronic devices have become increasingly smaller (lighter, thinner, shorter and smaller), and along with this, the conductors of the electric wires for wiring inside electronic devices are also becoming smaller in diameter.

As the diameter of the conductor becomes smaller, its strength against repeated bending and heat applied during the electronic device manufacturing process decreases relatively, and the terminal crimp connection points and brazing of the conductor are often exposed to heat. Disconnection is likely to occur at mechanical weak points,
Becomes less reliable.

In addition, since industrial robots and the like repeatedly move to the taught position, the conductors of the robot cables used in these robots are constantly subjected to repeated bending and tension, and are placed in conditions that are prone to wire breakage. Become. Furthermore,
The conductors of cables for industrial robots used in high-temperature environments suffer from further decreases in cyclic bending strength and tensile strength due to external heating.

As mentioned above, the conductors of electric wires for wiring inside electronic devices and the conductors of cables for industrial robots are mainly required to have the following characteristics.

a) Excellent cyclic bending strength h) Excellent tensile strength C) Good electrical conductivity d) Excellent heat resistance Conventionally, examples of materials satisfying the above characteristics include: Cu-Fe
-(P,B) alloys have been proposed. This alloy has Fe-P, Fe-B or Fe-P-H in the copper matrix.
By precipitating and dispersing intermetallic compounds in the form of fine crystals, it is possible to improve tensile strength and heat resistance while maintaining electrical conductivity. However, as mentioned above, as the conductors of electric wires for wiring inside electronic devices have become smaller in diameter, conductors that have superior repeated bending strength, tensile strength, and thermal properties than the above alloys without losing conductivity have been developed. Therefore, conventional alloys are still insufficient in performance to meet these demands.

<Purpose> The purpose of the present invention is to solve the problems of the prior art and provide a copper alloy that has good flexural strength, tensile strength, and heat resistance while maintaining good electrical conductivity.

<Structure> As a result of intensive study, the present inventors found that Fe, P, S
It has been found that a copper alloy containing a specific amount of n is suitable for the above purpose. That is, the heat-resistant, high-strength, highly conductive copper alloy of the present invention contains Fe, P, and Sn, and the content m is Fe: 0.02-1% by weight P: 15-80% by weight Sn relative to the Fe content : 0
．． 01 to 0.5% by weight of melon, with the remainder being copper.

In the copper alloy of the present invention, the reason why the Fe content is set to 002 to 1% by weight is that if it is less than 002% by weight, the cyclic bending strength
This is because the effect of improving tensile strength and heat resistance is small, and on the other hand, if it exceeds 1% by weight, there is a significant decrease in conductivity. P
The content should be added in an amount of 15 to 80% by weight based on the existing Fe content to further enhance the surface characteristics improved by the addition of Fe and to suppress the decrease in conductivity caused by the addition of Fe. If the Fe content is less than the above-mentioned lower limit, the effect of adding P will not be exhibited, and conversely, if the addition of P exceeds the above-mentioned upper limit, the conductivity will be impaired. The Sn content was set to 0.01 to 05% by weight.
If it is less than 1% by weight, the effect of improving the cyclic bending strength, tensile strength, and heat resistance will be small, and if it exceeds 0.5% by weight, the conductivity will be significantly lowered.

Effects> The copper alloy of the present invention has good electrical conductivity, and has excellent performance such as repeated bending strength, tensile strength, and heat resistance, so it can be used, for example, in electric wires for wiring in electronic devices such as VTRs, and for industrial robots. Preferably used for the four bodies of the cable. In addition, it can also be suitably used as a strand of terminal lead wire for electronic equipment components such as semiconductors.

In addition, the conductor of the above-mentioned robot cables and electric wires for wiring inside electronic equipment is a group of stranded wires (for example, 018 to 0.06 mm in diameter).
It is more preferable to use the wires when the wires are bundled together and the wires are tightly twisted together.

<Dear deaf person> In order to further clarify the features of the present invention, Examples, Comparative Examples, and Conventional Examples will be shown below.

Each sample material was adjusted as follows.

First, copper is melted under a charcoal coating in a high-frequency melting furnace, and then F
e5P and Sn were added to obtain a uniform molten metal. This molten metal was poured into a carbon mold and made into a 130mm diameter
An ingot with a length of 700 mm was produced. In order to prevent oxidation of the alloy during casting, work was carried out while blowing gas into the tap hole and receiver. After cutting the cast ingot and finishing the surface, it was hot extruded at a temperature of approximately 900°C. A rough drawn wire with a diameter of 11 mm was obtained by water cooling. This rough drawn wire was further cold drawn to a diameter of 0.13 mm. After annealing the copper alloy wire with a diameter of 0.13 mm thus obtained,
Repeated bending strength, tensile strength and electrical conductivity were measured.

These results and the above annealing conditions are as shown in the table. The same table shows Cu, which is outside the composition range of the present invention, as a comparative example.
-Fe-P-5n alloy, as a conventional example Cu -Fe
-Measurement results for P alloy and pure copper are also listed.

(Left below) Calculate the number of times up to No. 172, assuming that 90 degree bending is one time.
It was taken as the repeated bending strength value.

From the results of each example shown in the table after heat treatment at high temperatures, it is clear that the copper alloy of the present invention has excellent cyclic bending strength, tensile strength, and heat resistance, and maintains high electrical conductivity.

Claims (1)

[Claims] (1) Contains Fe, P and Sn, the content of which is Fe:
0.02 to 1% by weight P: 15 to 80% by weight with respect to Fe content Sn: 0.01 to 0.5% by weight, and the balance is copper. Copper alloy.