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High-conductivity soft aluminum monofilament and preparation method thereof

A high-conductivity, single-filament technology, applied in the field of overhead conductors, can solve problems such as large resistance loss, and achieve the effects of high current carrying capacity, low electrical loss, and significant social and economic benefits.

Active Publication Date: 2021-11-23
JIANGSU ZHONGTIAN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the soft aluminum monofilaments produced in China are all annealed 1350 alloys, and the conductivity of the alloy single wires is generally around 63% IACS. Chinese patents CN110819852A and CN104975246A both proposed a soft aluminum monofilament preparation process with a conductivity of 63.5% IACS. It is still relatively large, and the conductivity needs to be further improved on the basis of ensuring the strength

Method used

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  • High-conductivity soft aluminum monofilament and preparation method thereof
  • High-conductivity soft aluminum monofilament and preparation method thereof

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preparation example Construction

[0034] see figure 1 , the preparation method of the high-conductivity annealed aluminum monofilament provided by the present invention specifically comprises the following steps:

[0035] (1) Melting of molten aluminum: Add aluminum ingots and aluminum-iron alloys with a purity of >99.93% to the melting furnace, stir fully after melting to make the temperature and composition of the molten aluminum uniform, and remove surface dross; take samples for spectral analysis to control the molten aluminum The ingredients are within the required range.

[0036] (2) Refining in the furnace: transfer the molten aluminum in the smelting furnace to a 10-ton capacity tilting holding furnace, add aluminum-boron intermediate alloy and aluminum rare earth intermediate alloy, turn on the electromagnetic stirring device at the bottom of the furnace to fully stir, and control the temperature of the molten aluminum at 740-750°C, using a telescopic rotary blowing device, using high-purity nitrogen...

Embodiment 1

[0046] Step 1: Select aluminum ingots with a purity >99.93% and a small amount of aluminum-iron alloy into the regenerative melting furnace. After complete melting, stir fully to make the temperature and composition of the molten aluminum uniform, and remove the surface scum.

[0047] Step 2: Transfer the aluminum liquid to a 10-ton capacity tilting holding furnace, add aluminum-boron master alloy and aluminum-rare-earth master alloy, and turn on the electromagnetic stirring device at the bottom of the furnace to fully stir. Control the temperature of the molten aluminum at 740°C, use a telescopic rotary blowing device, and use high-purity nitrogen as the degassing medium to treat the molten aluminum in the furnace for 10 minutes, carry out thorough slag removal, and then adjust the temperature to 725°C and let it stand Process for 40 minutes.

[0048] Step 3: The liquid aluminum is released from the holding furnace through the launder, and the molten aluminum is refined on-li...

Embodiment 2

[0056] Step 1: Select aluminum ingots with a purity >99.93% and a small amount of aluminum-iron alloy into the regenerative melting furnace. After complete melting, stir fully to make the temperature and composition of the molten aluminum uniform, and remove the surface scum.

[0057] Step 2: Transfer the aluminum liquid to a 10-ton capacity tilting holding furnace, add aluminum-boron master alloy and aluminum-rare-earth master alloy, and turn on the electromagnetic stirring device at the bottom of the furnace to fully stir. Control the temperature of the molten aluminum at 745°C, use a telescopic rotary blowing device, and use high-purity nitrogen as the degassing medium to treat the molten aluminum in the furnace for 10 minutes and thoroughly remove slag, then adjust the temperature to 722°C and let it stand Process for 40 minutes.

[0058] Step 3: The liquid aluminum is released from the holding furnace through the launder, and the molten aluminum is refined on-line after t...

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Abstract

The invention discloses a high-conductivity soft aluminum monofilament and a preparation method thereof. The preparation method comprises the following steps of molten aluminum smelting, in-furnace refining, online refining, ultrasonic treatment, continuous casting, continuous rolling, drawing and annealing; a grain refiner can be more evenly dispersed in molten aluminum through ultrasonic treatment; and meanwhile, the cavitation effect of ultrasonic treatment can promote production of a large number of crystal nucleuses in aluminum melt, so that grain refinement is achieved in the subsequent casting process, after ultrasonic treatment, the size of cast-state grains can be smaller than 300[mu]m, the purpose of effectively improving the strength of the soft aluminum monofilament is achieved, the strength of the soft aluminum monofilament prepared through the method ranges from 60 MPa to 90 MPa, and the electric conductivity is larger than or equal to 64% IACS.

Description

technical field [0001] The invention relates to the technical field of overhead wires, in particular to a high-conductivity annealed aluminum monofilament with a conductivity ≥ 64% IACS and a preparation method thereof. Background technique [0002] Overhead wire transmission lines are the energy aorta of national economic and social development. With the continuous growth of electricity demand, the load pressure of existing transmission lines is becoming increasingly prominent. Due to the increasingly tight land resources, the construction of new transmission corridors is greatly restricted. It is an effective method to increase the capacity of existing transmission lines, increase the continuous operating temperature of conductors, and greatly increase the ampacity of conductors. The heat-resistant aluminum alloy can effectively increase the operating temperature of the wire, but the heat-resistant aluminum alloy wire has a high resistivity, a large line loss, and the wire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/00C22C21/02C22C21/12C22F1/04C22F1/043C22F1/057B21C37/04
CPCC22C1/03C22C1/026C22C1/06C22C21/02C22C21/00C22C21/12C22F1/04C22F1/043C22F1/057B21C37/04
Inventor 白清领陆伟缪姚军单小龙周峰缪小林徐海波
Owner JIANGSU ZHONGTIAN TECH CO LTD
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