JPS63262437A - Copper alloy with excellent conductivity and strength - Google Patents

Abstract

PURPOSE:To produce a copper alloy having high electroconductivity, excellent tensile strength and bending resistance by prepg. the copper alloy contg. specific ratios of Mg, P and Sb. CONSTITUTION:The copper alloy contg., by weight, 0.02-0.5% Mg, 35-100% P for Mg, 0.01-0.5% Sb and the balance consisting substantially of copper is prepd. By this method, the copper alloy which has the excellent bending strength, tensile strength, electroconductivity and various mechanical strength and is suitable as a conductor of an electric wire for wiring in an electronic equipment, etc., is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has high conductivity suitable for use as a conductor for wiring in electronic devices and a conductor for cables for industrial robots, and also has high tensile strength and Concerning a copper alloy with excellent bending resistance.

Copper alloys that exhibit excellent mechanical properties such as electrical conductivity and tensile strength over a wide temperature range are known, for example, copper alloys that contain magnesium and phosphorus in specific amounts (Tokuko Showa). No. 49-10894).

In addition, zirconium is used as a highly conductive and heat-resistant copper alloy.
．． Copper alloys containing 0.01-0.15% by weight are also known.

In recent years, with the development of electronic devices, they have become increasingly lighter, thinner, and shorter, and as a result, the conductors for wiring in electronic devices are also becoming smaller in diameter. For example, in the copper alloy containing Mg and P according to the above-mentioned Japanese Patent Publication No. 49-10894, when the conductor has a small diameter of about 0.3ms+φ to 0.0IIIsφ, Cannot maintain sufficient strength against applied heat.

That is, since the heat resistance is not sufficient, the parts that are sometimes heated during brazing become mechanical weak points and are prone to wire breakage. Furthermore, the above-mentioned zirconium copper has the disadvantage that it is prone to breakage at terminal crimping connection points of the conductor, since it lacks repeated bending strength. Incidentally, in this case, even if an attempt is made to increase the strength by increasing the zirconium content, the content will vary, making it impossible to obtain an alloy of stable quality.

Furthermore, since industrial robots repeatedly operate up to the taught position, the robot cable conductors used in these robots are constantly subjected to repeated bending and tension, making them susceptible to wire breakage. In addition,
Cable conductors for industrial robots used in high-temperature environments are subjected to repeated bending and tension under heating.

Therefore, under such conditions, the cyclic bending strength and tensile strength of the conductor are significantly reduced.

Due to the use of these conductors under harsh conditions, such as small-diameter conductors for wiring in electronic equipment and cable conductors for industrial robots, these conductors are not as good as conventional ones with excellent heat resistance. In addition to good electrical conductivity, there is a need to provide conductors that have improved cyclic bending strength and tensile strength.

The present invention was developed in view of the situation on the ridge, and is suitable for use in small-diameter conductors for wiring in various miniaturized electronic devices and cables for industrial robots used in high-temperature atmospheres. An object of the present invention is to provide a copper alloy having excellent bending strength and tensile strength, excellent conductivity, and various mechanical strengths, which can be effectively used as a conductor.

The present invention will be explained in detail below.

The feature of the present invention is that it contains 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus relative to magnesium, and 0.01 to 0.5% by weight of antimony. is present in a copper alloy consisting essentially of copper.

In the copper alloy according to the present invention for making i+'t, 0.02 to 0.0.
5% by weight, and 35 to 100% by weight of P to Mg to further improve its strength, and 0.01 to 0.5% by weight of sb to improve tensile strength and repeated bending strength.
Added.

The basis for adding each of the above elements to each of the above specific ranges is based on the following reasons.

Regarding Mg, if the amount added exceeds 0.5% by weight, the conductivity of the resulting copper alloy will decrease significantly, and in addition, it is difficult to control the Mg content in the copper alloy, so the quality of the copper alloy will deteriorate. Becomes unstable. On the other hand, Mg is 0.02% by weight
If it is less than
Become. Regarding P, if the amount added is less than the lower limit of the specific range, the effect of adding P will not be exhibited, while if it exceeds the upper limit, the conductivity of the copper alloy will be impaired.

Next, regarding the amount of sb added, if it is less than 0.01% by weight, the effect of improving cyclic bending strength and tensile strength will not be sufficient, while if it exceeds 0.5% by weight, the high conductivity of the copper alloy cannot be maintained. It disappears.

According to the invention, Mg is 0.02-0.5% by weight, P is 35-100% by weight relative to Mg, and 5b-t-o,
Table 1 shows the results of measuring the conductivity, tensile strength, elongation, and repeated bending strength of the copper alloy containing 0.5% by weight using conventional methods.

For comparison, the results of similar measurements for copper alloys containing the above-mentioned elements in amounts outside the specified ranges are also shown in Table 1.

As seen in Table 1, the copper alloy with the composition according to the present invention is
It can be seen that while all of the above physical properties are good on average, the comparative examples outside the composition range of the present invention are poor in any of the physical properties.

Therefore, the copper alloy according to the present invention is not only suitable as a conductor for conventional wiring wires in electronic equipment or as a conductor for cables for industrial robots, but also as a conductor for cables for industrial robots.
It has the ability to be effectively used as an extremely thin conductor of about 3 mmφ to 0.01+w−φ and as a cable conductor for robots that perform repetitive operations.

The present invention will be specifically explained below with reference to Examples.

EXAMPLE Electrolytic copper was melted in an argon atmosphere in a high-frequency melting furnace, and Cu-Mg was added so as to have a composition of 41% by weight of Mgfo, 0.37% by weight of P, and 0.31% by weight of sb.

Add each mother alloy of Go-P and sb metal, 15m
An ingot with a length of s + angle x 200a + m was produced.

Then, the wire treated as described above was further cold drawn to 0.08+ssφ and 400 t.
The alloy was annealed for 1 hour to obtain a Cu-Mg-P-5b copper alloy.

The tensile strength, elongation, electrical conductivity, and repeated bending strength of the obtained copper alloy were measured by conventional methods.

The results are as follows.

Claims (1)

[Claims] It is characterized by containing 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus based on magnesium, and 0.01 to 0.5% by weight of antimony, with the balance consisting essentially of copper. Highly conductive copper alloy.