JPS606042B2 - Dissimilar metal coated aluminum alloy conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum alloy conductor used for electric wires, such as communication cables, winding wires, indoor wiring, etc.

Copper is exclusively used as the conductor material for the above-mentioned electric wires, but recently there has been a movement to use aluminum as the conductor due to the depletion of copper resources and the instability of copper prices.

However, simply converting to electrical aluminum, commonly known as pure aluminum, results in a significant setback in terms of connectivity compared to copper. It cannot be treated in the same way as copper. From this point of view, aluminum alloy conductors or dissimilar metal-coated aluminum conductors, such as those coated with copper or plated with nickel, have been developed, but although they offer improved connectivity compared to electrical aluminum, However, it was a fact that it was inferior to copper.

In view of these facts, the present inventors continued research on the connectivity of aluminum alloy conductors and dissimilar metal-coated aluminum conductors to wiring devices, etc., and as a result, they obtained the conductor of the present invention. The key points are to have a low connection resistance value with a pressing force of It is an object of the present invention to provide a conductor with superior connectivity than aluminum conductors coated with copper or nickel.

The present invention contains magnesium 0.05-0.35% and copper 0.05%.
Copper, tin,
This is a dissimilar metal-coated aluminum alloy conductor coated with a metal or alloy of nickel and one of their respective alloys.

In the present invention, magnesium and copper, which are additive elements of aluminum alloy conductors, and iron, which is an impurity, are each limited to specified values. This was determined not only by considering the following items, but also by considering creep resistance, improvement of compression relaxation characteristics, and plating properties of aluminum conductors, which have a large effect on the connectability of aluminum conductors. be.

The reason why magnesium is defined as 0.05 to 0.35% in the present invention is that if it is less than 0.05%, it will have little effect on improving strength and creep resistance, and if it exceeds 0.35%, it will cause a decrease in electrical conductivity. This is because it gets bigger.

Also, the copper content specified as 0.01% to 0.2% is 0.01%.
If it is less than 0.0, there is no effect on improving strength or cleaving resistance.
This is because when it exceeds 2%, the conductivity decreases significantly.

Further, the reason why iron is specified to be 0.2% or less is that if it exceeds 0.2%, it has disadvantages such as poor plating properties, peeling, and inability to draw wire after plating.
．． 1% or less is desirable.

In addition, in the aluminum alloy conductor of the present invention, in addition to the above-mentioned essential additive elements, Sb is added to this type of conductive aluminum alloy for the purpose of improving corrosion resistance, conductivity, and heat resistance.
There is no problem in adding various rare elements such as , Be, Zr, Co, Ni or Ce in a total amount of 0.2% or less.

The reason why the total amount is set to 0.2% or less is that if it exceeds 0.2%, the plating performance will be significantly reduced. Next, as the coating material in the present invention, any of copper, tin, nickel, and alloys thereof may be used, and these have effects such as reducing contact resistance when connecting conductors and improving solderability. Although the present invention is mainly directed to plating, other known coating methods such as cladding, dipping, etc. may be used without any problem.

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

Example: An alloy having the composition shown in Table 1 was melted by a normal method, and 2
After casting into an ingot with 5 sides x 25 sides, hot rolling and cold wire drawing were performed to make the 2nd side wire.
The burning anchor of time was applied.

Table 1: This wire was then subjected to the usual alkali polishing and etching, followed by a sinking treatment with a solution of 1.1 mm, followed by a strike of 1 French steel in a cyanizing steel bath, followed by ordinary electroplating. Depending on grade, each plate was plated with copper to a thickness of 8A, nickel to a thickness of 3A, and tin to a thickness of 10M.

For comparison, electrical aluminum was subjected to the same treatment as described above. The characteristic values of the 2-line ◇ line before plating after the above-mentioned phosphor annealing at 300° C. for 2 hours were as shown in Table 2.

Table 2 Note) *Tested at E0, stress 5&/female, room temperature.

The average value for 200 to 500 hours is shown.

From Table 2, alloy No. for the present invention. 1 and 2 are electrical aluminum No. 1, which is a recent conventional technology. It can be seen that compared to No. 3, the strength as a soft material is higher and the creep resistance is excellent.

Samples with various plating and 1.6 pieces as standard sample? For each of the mild steel wires (tensile strength 24 kg', elongation 42%, electrical conductivity 101%), a sample was created using a tightening type terminal (torque 7 [9]), and
The so-called connectivity was evaluated by carrying out an energization heat cycle test up to 500 cycles, with one cycle of current value of 4 plates L, 48 minutes of energization and 45 minutes of cooling. here 5
The results of the evaluation are as shown in Table 3, where the temperature increase value of the connection part between the 00th cycle and the 25th cycle is 800 or more as a failure, and is expressed as the number of failures/number of tests. Third
From Table 3, electrical aluminum No. The wire No. 3 in which the wire is plated is inferior to the copper wire in terms of stability of temperature rise, but the wire No. 3 according to the present invention is inferior to the copper wire in terms of stability of temperature rise. 1,2
It can be seen that the connectivity of steel has been improved, and it has almost the same connectivity as steel.

As described above, the present invention uses magnesium as a core material.
．． 05-0.35%, copper 0.01-0.2%, iron 0.2
% or less, the remainder is essentially aluminum, and the aluminum alloy conductor is coated with a different metal, so the effects of the present invention are that it has excellent strength and conductivity as a conductor, and This improves creep resistance, which has a major effect on the connectivity of aluminum conductors.
It has the advantage of excellent connectivity and is also characterized by ease of electroplating on alloy conductors.

Further, in the present invention, since the surface is coated with one of copper, tin, nickel, and their alloys, it has effects such as lowering contact resistance when connecting conductors and improving solderability.

Claims (1)

[Claims] 1 Magnesium 0.05~0.35%, Copper 0.01~
0.2% iron, 0.2% or less iron, and the remainder essentially aluminum, and the aluminum alloy conductor is coated with one of copper, tin, nickel, and their respective alloys. Aluminum alloy conductor coated with dissimilar metals.