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High-strength heat-resistant heterogeneous aluminum alloy conductor and preparation method thereof

An aluminum alloy wire and high-strength technology, applied in the field of high-strength heat-resistant heterogeneous aluminum alloy wire and its preparation, can solve the problems of poor integrity, high cost, influence on electrical conductivity, etc., and achieve less restrictions, low material cost, The effect of mature equipment

Active Publication Date: 2021-04-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing heat-resistant aluminum alloy wires are mainly alloyed by adding Zr elements, and the conductivity is improved by adding rare earth elements, such as Al-Zr-Y, Al-Zr-Er (application number: CN 111349820A), Al-Zr-Er -Yb (application number: CN111434789) and other heat-resistant conductive aluminum alloys, but the content of rare earth elements is not easy to control and the cost is high, which limits industrial applications
In addition, in the industry, heat-resistant aluminum wires are prepared by twisting to form a composite structure. For example, Wu Xiaokuan et al. invented a method for preparing high-conductivity heat-resistant aluminum alloy wires (patent number: CN 109887681), by twisting composite fibers and aluminum alloys Preparation of high-conductivity and heat-resistant aluminum alloys, but the twisted aluminum wires are multi-strand wires with poor mechanical integrity and poor electrical conductivity

Method used

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  • High-strength heat-resistant heterogeneous aluminum alloy conductor and preparation method thereof
  • High-strength heat-resistant heterogeneous aluminum alloy conductor and preparation method thereof
  • High-strength heat-resistant heterogeneous aluminum alloy conductor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The AlN / Al composite material is first hot-extruded into a cylindrical rod with an inner diameter of 26 mm, an outer diameter of 30 mm, and a length of 1.5 m, and a 1070 aluminum rod with a length of 1.5 m and a diameter of 26 mm is selected. After cleaning the inner surface of the cylindrical bar and the outer surface of the aluminum bar, the two are nested together, and the rotation speed is 40r / min, the feed speed is 15mm / s, and the multi-pass swaging is directly 18.2 mm, the corresponding strain is ε=1( where A 0 is the cross-sectional area before deformation; A 1 is the deformed cross-sectional area). After heat preservation at 325°C for 100 hours, the tensile strength under this strain remains at 156MPa, and the conductivity is 60.1%IACS, compared with the tensile strength of the heterogeneous wire before heat preservation is 168MPa, and the conductivity of 1070 aluminum alloy is 60.9%IACS. It can be seen that the strength and high temperature retention rate o...

Embodiment 2

[0028] The AlN / Al composite material is first hot-extruded into a cylindrical rod with an inner diameter of 24 mm, an outer diameter of 30 mm, and a length of 1.5 m, and a 1070 aluminum rod with a length of 1.5 m and a diameter of 24 mm is selected. After cleaning the inner surface of the cylindrical bar and the outer surface of the aluminum bar, the two are nested together, and the rotation speed is 40r / min, the feed speed is 15mm / s, and the multi-pass swaging is directly 18.2 mm, the corresponding strain is ε=1. After 100 hours of heat preservation at 325°C, the tensile strength under this strain remains at 162MPa, and the conductivity is 59.4% IACS, which is 170MPa compared to the tensile strength of the heterogeneous wire before heat preservation. And 1070 aluminum alloy has a conductivity of 60.9% IACS. It can be seen that the strength and high temperature retention rate of the heterogeneous aluminum wire of this patent at 325°C is 95.3%, which is greater than 90%. Not o...

Embodiment 3

[0030] The AlN / Al composite material is first hot-extruded into a cylindrical rod with an inner diameter of 22 mm, an outer diameter of 30 mm, and a length of 1.5 m, and a 1070 aluminum rod with a length of 1.5 m and a diameter of 22 mm is selected. After cleaning the inner surface of the cylindrical bar and the outer surface of the aluminum bar, the two are nested together, and the rotational speed is 40r / min, the feed speed is 15mm / s, and the multi-pass swaging is directly performed to 18.2mm , and the corresponding strain is ε=1. After holding at 325°C for 100h, the tensile curve of the obtained heterogeneous aluminum wire (such as image 3 shown), its tensile strength is about 187MPa, and the conductivity of the heterogeneous wire is about 57.2% IACS. Compared with the tensile strength of the heterogeneous wire before heat preservation is 194MPa, and the conductivity of 1070 aluminum alloy is 60.9% IACS. It can be seen that the strength and high temperature retention rate...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a high-strength heat-resistant heterogeneous aluminum alloy conductor and a preparation method thereof. The method adopting a high-conductivity aluminum bar and a high-strength high-temperature-resistant aluminum-based composite material as raw materials comprises the following steps of (1) performing hot extrusion on the high-strength high-temperature-resistant aluminum-based composite material to form a cylinder with a predetermined size; (2) making the high-conductivity aluminum bar with a selected diameter penetrate into the cylinder to form a whole; and (3) performing rotary swaging deformation so as to stably combine the high-conductivity aluminum bar and the cylinder to obtain the heterogeneous aluminum conductor. The preparation method is simple to operate, has universality, high production efficiency, and the heterogeneous conductor is easy to control in diameter, good in interface bonding, good in surface smoothness, good in heat resistance and conductivity matching, low in cost and prone to realize industrialization, and has huge industrial application value.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a high-strength heat-resistant heterogeneous aluminum alloy wire and a preparation method thereof. Background technique [0002] With the development of the electric power industry, transmission lines are showing a trend of large capacity, high voltage, and long distance. The steel-aluminum composite stranded wires commonly used in the early days have been unable to meet the needs of the expansion and reconstruction of old urban lines and the construction of new lines for the comprehensive performance of conductors. , the heat-resistant aluminum alloy wire has excellent heat resistance, except that the conductivity is slightly lower than that of ordinary duralumin wire, which can meet the requirements of increasing the current carrying capacity of the wire, and its strength can also meet the needs of long-distance transmission lines. At the same time, it has quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04
CPCB21C37/042B21C37/047
Inventor 聂金凤伍玉立郝肖杰范勇赵永好周浩李玉胜曹阳
Owner NANJING UNIV OF SCI & TECH