JPS5818421B2 - aluminum powder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat-resistant, high-strength, conductive aluminum alloy.

Conventionally, in the field of overhead power transmission lines, steel-core aluminum wire (AC8R), which is a combination of conductive aluminum and steel wire, and steel-core heat-resistant aluminum alloy stranded wire (TAC8R), which is a combination of heat-resistant aluminum and steel wire, have been used as power transmission lines. It was widely used.

On the other hand, in the field of power distribution lines, all-aluminum alloy stranded wire (AAAC) made of high-strength aluminum (AAAC) f, jc, etc. is used, but in recent years steel wires have been used with the aim of increasing power transmission capacity and reducing tower construction costs. There has been an increasing demand for wires made from aluminum alloys, which are not used.

Therefore, there is a need for an aluminum alloy that has tensile strength comparable to high-strength aluminum, heat resistance comparable to heat-resistant aluminum, and at the same time has appropriate electrical conductivity.

However, as shown in Table 1, conventional alloys do not satisfy the above requirements; those with high tensile strength have poor heat resistance, and conversely, those with excellent heat resistance have low tensile strength. It wasn't something.

The present invention eliminates the conventional drawbacks and provides a conductive aluminum alloy that satisfies the above-mentioned needs.
r 0.05-0.11 weight ratio, Bo, 05-0.3
Weight section, including C00.05~0.2 weight section, the rest is A
The present invention is a heat-resistant, high-strength, electrically conductive aluminum alloy characterized by consisting of I and unavoidable impurities. The problem of improving the mechanical properties was solved by adding trace amounts of B and Co to the Al-Fe-Cu-Zr system; B combines with Zr to form ZrB2 and is dispersed in the aluminum matrix. However, the effect is that the heat resistance is improved by the generation of ZrB2 compared to the case where the amount of Zr added is simply reduced.

The amount of B added to the Al-Fe-Cu-Zr system is
O, 3 to 0.7 weight factor, Cu O, 1 weight factor, Zr0.
0.05 to 0.05 to 0.05 to 0.05 to 0.11% by weight composition.
A range of 3 weights is appropriate.

If added in an amount greater than this range, B forms a compound with AI and grows and precipitates in a plate shape, impairing cold workability, and if added below this range, the electrical conductivity cannot be recovered.

Therefore, the lower limit of the amount of B added in the present invention is the minimum amount for improving electrical conductivity, and the upper limit is the maximum amount that does not impair cold workability.

Next, the amount of Co added is 0.05 in the above alloy composition.
~0.2 weight factor is appropriate.

Co, like Fe, has the effect of strengthening the aluminum matrix by forming an intermetallic compound with Al without forming a solid solution in At, but exhibits the following effects within the range of the amount added.

Compared to the same amount of Fe, Co does not impair electrical conductivity and can increase tensile strength, and does not impair cold workability compared to Fe.

The upper limit of this addition amount is the maximum amount that does not impair electrical conductivity, and the lower limit is the minimum amount that provides mechanical strength.

Among the above elements, most of them are dissolved in solid solution in FeciAl.
, r<AI, forming an intermetallic compound, which has the effect of dispersing and strengthening the aluminum matrix, and since it is not solidly dissolved in AI, it does not lower the electrical conductivity.

Cu is dissolved in AI to strengthen the aluminum matrix, improve heat resistance, increase work hardening ability, and increase tensile strength by wire drawing. Partially dissolves in solid solution and improves heat resistance.

The upper limit of the range of addition amounts of these elements is the maximum amount that does not affect the electrical conductivity of the alloy of the present invention, and the lower limit is the minimum amount that provides mechanical strength and heat resistance.

Example: Electrical aluminum ingot (EC grade) was melted, each component was added to it, cast, swaged and then cold drawn to make a wire rod with a diameter of 3.8 mm. The results of measuring the electrical conductivity and the residual strength after heating at 230° C. for 1 hour are shown in Table 2.

This table shows that the alloy of the present invention is superior to conventional alloys.

Claims (1)

[Claims] I Fe0.3-0.7 weight ratio, Cu O, 1 weight ratio, Z r 0.05-0.11 weight ratio, BO105-0
．． A heat-resistant, high-strength, electrically conductive aluminum alloy characterized by containing 3% by weight and 0.5 to 0.2% by weight Co, and the remainder consisting of Al* and unavoidable impurities.