High-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and preparation method thereof

Abstract

The invention discloses a high-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and a preparation method thereof. The aluminium alloy cable conductor disclosed by the invention is composed of the following constituents in percentage by mass: 0.3-1.1% of Fe, 0.1-0.5% of Cu, 0.01-0.2% of Hf, 0.01-0.05% of B, 0.02-0.1%, and the balance of Al. The preparation method comprises the following steps of: proportioning according to the designed alloy constituents, smelting and pouring, homogenizing-annealing and hot-extruding, cold-drawing and annealing to finally obtain the aluminium alloy cable conductor. The aluminium alloy cable conductor prepared by the preparation method disclosed by the invention has an elongation after fracture being greater than 25%, tensile strength being greater than 110 MPa, and conductivity being 61.0-62.5%. By using the conductor manufactured by the preparation method disclosed by the invention, transmission capacity can be increased and electric energy loss can be reduced due to the introduction of other alloy elements; and moreover, many high-temperature stable phases are distributed on the crystal boundaries and in the crystals of alloys, so that the high-temperature performance and the creep-resistant performance of the alloy conductor can be improved, thus guaranteeing the service life and safety of the conductor.

Description

technical field [0001] The invention discloses a high-conductivity creep-resistant aluminum alloy cable conductor containing Hf and Ce and a preparation method thereof, belonging to the technical field of aluminum alloy materials. Background technique [0002] Aluminum alloy has the advantages of high specific strength, high electrical conductivity, good plasticity, good wear resistance and corrosion resistance, so it has an advantageous position in the field of power transmission. With the development of my country's economy and the improvement of people's living standards, the electricity consumption of residents continues to increase. During the use of wires, the contact points are caused by internal stress due to the instantaneous high temperature (150°C) generated by the connection, and the wires undergo short-term creep. , Under frequent creep action, accidents such as failure of conductor materials and burning of insulating materials outside the conductor will occur. T...

AI Technical Summary

Problems solved by technology

The price of copper wire is more expensive, more than three times that of aluminum

Although the elongation rate of the soft pure aluminum conductor is much higher than that of the hard state, its tensile strength is greatly reduced, and its creep resistance is very poor. Potential safety hazards during use

Despite the rapid development of aluminum alloy cables, as wires for construction, there are various problems in the existing aluminum alloy cables: Al-Mg-Si series alloy wires are due to Mg 2 The precipitation strengthening effect of Si phase has high room temperature strength, but due to the 2 Si is not a stable phase at high temperature, the strength loss is serious at high temperature, and the high temperature resistance and creep performance are poor; Al-Zr series alloy wires have good heat resistance Al 3 Zr phase, so high temperature performance and creep resistance are good, but the electrical conductivity is low, only 58% IACS, although the electrical conductivity of the Al-Zr-Y series alloy wire with rare earth addition reaches 60% IACS, but with the steel core aluminum strand Compared with the electrical conductivity of 61% IACS of electric power aluminum in the wire, there is still a gap

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