JPH0353374B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a copper alloy having high electrical conductivity suitable for use as a conductor for wiring in electronic devices and a conductor for cables for industrial robots, as well as having excellent tensile strength and bending resistance. . Conventional technology 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. 49−10894
issue). In addition, a copper alloy containing 0.01 to 0.15% by weight of zirconium is also produced as a highly conductive and heat-resistant copper alloy. 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. It is becoming impossible for me to demonstrate my abilities. For example, in the copper alloy containing Mg and P according to the above-mentioned Japanese Patent Publication No. 49-10894, 0.1mmφ~
When a conductor has a small diameter of about 0.01 mmφ, it cannot maintain sufficient strength against the heat applied during the electronic device manufacturing process. That is, since the heat resistance is not sufficient, the portions that are heated during brazing become mechanical weak points and are likely to break. In addition, the above-mentioned zirconium copper has a drawback that it is prone to breakage at terminal crimp connection points of the conductor because of its insufficient 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 repeated bending strength and tensile strength of the conductor are considerably reduced. As mentioned above, due to the use under harsh conditions such as small-diameter conductors for wiring in electronic devices and cable conductors for industrial robots, these conductors are not as good as their conventional excellent heat resistance. In addition to good electrical conductivity, there is a desire to provide a conductor that has further improved cyclic bending strength and tensile strength. Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned circumstances, and is directed to small-diameter conductors for wiring in various miniaturized electronic devices and cables for industrial robots used in high-temperature atmospheres. It can also be effectively used as a conductor for
The object of the present invention is to provide a highly conductive, heat-resistant copper alloy that has excellent cyclic bending strength and tensile strength. The present invention will be explained in detail below. Structure of the Invention The present invention is characterized in that magnesium is selected from the group consisting of 0.02-0.5% by weight of magnesium, phosphorus of 35-100% by weight of magnesium, zirconium of 0.01-0.8% by weight, and indium, tin, lead and antimony. It is a copper alloy containing 0.01 to 0.5% by weight of two types in total, with the remainder consisting essentially of copper. Means for Solving the Problems The highly conductive copper alloy according to the present invention is produced by adding 0.02 to 0.5% by weight of Mg to electrolytic copper as a base material to further improve its strength, mainly to increase its mechanical strength. Therefore, P is 35 to 100% by weight relative to Mg,
0.01-0.8 wt% Zr, to improve conductivity
and two types selected from In, Sn, Pb and Sb,
Add 0.01 to 0.5% by weight in total to improve tensile strength and repeated bending strength. The basis for adding each of the above elements in 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 will be difficult to control the Mg content in the copper alloy, resulting in poor quality of the copper alloy. On the other hand, if it is less than 0.02% by weight, the effect of improving cyclic bending strength and tensile strength will be reduced. Also, regarding P,
If the amount added is less than the lower limit of the specific range, precipitation of a compound with Mg will not proceed and 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. Regarding Zr, if the amount added is less than 0.01% by weight, the repeated bending strength and heat resistance will not be sufficient, and if it exceeds 0.8% by weight, the content will fluctuate greatly, causing problems in terms of quality and also decreasing electrical conductivity. Significant. Next, regarding the amount of addition of two types selected from In, Sn, Pb and Sb, if the total addition amount is less than 0.01% by weight, the improvement in tensile strength and repeated bending strength will not be sufficient; If it exceeds this value, the high conductivity of the copper alloy cannot be maintained. Next, according to the present invention, Mg is 0.02 to 0.5% by weight, P is 35 to 100% by weight relative to Mg, and Zr is 0.01 to 0.5% by weight.
The conductivity, tensile strength, elongation, and bending strength of a copper alloy containing 0.8% by weight and a total of 0.01 to 0.5% by weight of two types selected from the group of In, Sn, Pb, and Sb were measured by conventional methods. Table 1 shows the results of the measurements. For comparison, Table 1 also shows the results of similar measurements for copper alloys containing the above-mentioned elements in amounts outside the above-mentioned ranges.

[Table] As shown in Table 1, the copper alloy with the composition according to the present invention has good average properties in all of the above physical properties, whereas the comparative examples outside the composition range of the present invention have
It can be seen that one of the physical properties is inferior. Therefore, the copper alloy according to the present invention is not only suitable as a conductor for conventional wiring wires in electronic devices and as a conductor for cables for industrial robots, but also as a conductor for wires for wiring in conventional electronic devices and as a conductor for cables for industrial robots. It has the ability to be effectively used as an extremely thin conductor and as a cable conductor for robots that operate repeatedly. The present invention will be specifically described below with reference to Examples. Example Electrolytic copper was melted in an argon atmosphere in a high-frequency melting furnace, and 0.3% by weight of Mg, 0.26% by weight of P, 0.25% by weight of Zr, 0.2% by weight of In, and 0.1% by weight of Sb were added.
Each master alloy of Cu-Mg, Cu-P, and Cu-Zr, and In and Sb metals were added so as to have a composition of % by weight, and a 15 mm square x 200 mm long ingot was produced. After face cutting the obtained ingot, it was hot rolled at 850°C to form a 6 mmφ wire, and solution treatment was performed at 850°C for 1 hour. The lines processed as above are then further
A Cu-Mg-P-Zr-In-Sb copper alloy was obtained by cold drawing to 0.08 mmφ and annealing at 400°C for 1 hour. 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.

【table】

Claims (1)

[Claims] 1 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus relative to magnesium, 0.01 to 0.8% by weight of zirconium, and a total of 0.01% of two selected from the group consisting of indium, tin, lead, and antimony. A copper alloy having excellent electrical conductivity, heat resistance, and bending resistance, characterized by containing ~0.5% by weight, with the remainder consisting essentially of copper.