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Continuous unidirectional solidification preparation method of high-purity oxygen-free copper rod

A technology of directional solidification and oxygen-free copper rod, which is applied in the field of preparation of new non-ferrous metal materials

Inactive Publication Date: 2015-04-29
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) The preliminary treatment of electrolytic copper is cumbersome, with heavy workload and low labor efficiency;
[0008] (3) Charcoal is used in smelting to prevent oxidation, which consumes a lot of wood and pollutes the environment;
[0009] (4) The holding furnace is covered with graphite flakes, and the oxygen removal effect is not good;
[0010] (5) The oxygen content cannot reach below 10ppm, the copper rods produced can only be ordinary anaerobic rods, and high-purity bright anaerobic rods cannot be produced

Method used

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  • Continuous unidirectional solidification preparation method of high-purity oxygen-free copper rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Bake cathode copper with a purity of 99.99% and an oxygen content of 10ppm in a holding furnace at 200°C for 2 hours to fully degas, then put it into a melting crucible in a vacuum directional solidification furnace, close the furnace door, and lock the safety lock of the furnace door. After passing through the cooling water, turn on the mechanical pump switch to evacuate to 10Pa, then start the molecular pump to further evacuate to 10Pa -2 Pa, turn on the heating power of the induction coil for heating the outer layer of the melting crucible, and melt the charge at 1280°C. At the same time, heat the graphite heater on the outer layer of the continuous directional solidification crucible to ensure that the temperature in the continuous directional solidification crucible is above the melting point of copper liquid 1083.4°C before pouring; press down the control lever and pour the refined copper liquid 2 into the continuous In the directional solidification crucible, kee...

Embodiment 2

[0031] Bake cathode copper with a purity of 99.99% and an oxygen content of 20ppm in a holding furnace at 200°C for 4 hours to fully degas, put it into a melting crucible in a vacuum directional solidification furnace, close the furnace door, lock the safety lock of the furnace door, and After entering the cooling water, turn on the mechanical pump switch to evacuate to 10Pa, then start the molecular pump to further evacuate to 10Pa -2 Pa, turn on the heating power supply of the induction coil for heating the outer layer of the melting crucible, and melt the charge at 1300°C. At the same time, heat the graphite heater on the outer layer of the continuous directional solidification crucible to ensure that the temperature in the continuous directional solidification crucible is above the melting point of copper liquid: 1083.4°C before pouring; press down the control lever and pour the refined copper liquid into the continuous In the directional solidification crucible, keep warm...

Embodiment 3

[0034] Bake cathode copper with a purity of 99.99% and an oxygen content of 15ppm in a holding furnace at 200°C for 3 hours to fully degas, put it into a melting crucible in a vacuum directional solidification furnace, close the furnace door, lock the safety lock of the furnace door, and After entering the cooling water, turn on the mechanical pump switch to evacuate to 10Pa, then start the molecular pump to further evacuate to 10Pa -2 Pa, turn on the heating power supply of the induction coil for heating the outer layer of the melting crucible, and melt the charge at 1300°C. At the same time, heat the graphite heater on the outer layer of the continuous directional solidification crucible to ensure that the temperature in the continuous directional solidification crucible is above the melting point of copper liquid: 1083.4°C before pouring; press down the control lever and pour the refined copper liquid into the continuous In the directional solidification crucible, keep warm...

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Abstract

The invention discloses a continuous unidirectional solidification preparation method of a high-purity oxygen-free copper rod. The preparation method comprises the following steps of: firstly roasting cathode copper with the purity of 99.99% for 2-4 hours in a heat preserving furnace with the temperature of 200 degrees centigrade to be fully degassed, secondly placing the cathode copper into a smelting pot in a vacuum unidirectional solidification furnace, smelting at 1250-1350 degrees centigrade, performing heat preservation for 20-30min, and casting by the continuous unidirectional solidification furnace. The vacuum degree of the continuous unidirectional solidification furnace is in the range from 0.01 to 1Pa, the casting speed is in the range from 10 to 150mm / min, the cooling water consumption is in the range from 200 to 1000L / h, the cooling water temperature is in the range from 20 to 25 degrees centigrade, and the high-purity oxygen-free copper rod with the diameter of 6-18mm is prepared. The high-purity oxygen-free copper rod is characterized in that the oxygen content is less than 4ppm, the single crystal structure or the continuous column crystal structure along a length direction is present, the conductivity, mechanical property and processing performance is excellent, the finished product ratio is high and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of preparation of new non-ferrous metal materials, and in particular relates to a preparation method for continuous directional solidification of high-purity oxygen-free copper rods. Background technique [0002] Oxygen-free copper is widely used in semiconductor bonding wires, high-fidelity audio cables, sputtering targets and other manufacturing fields due to its good electrical and thermal conductivity and corrosion resistance, and has extremely high economic value and strategic significance. [0003] With the continuous improvement of industrial technology, international and domestic requirements for oxygen-free copper rods continue to increase, especially for the oxygen content of oxygen-free copper rods. The oxygen content of the existing copper rods produced by continuous casting and rolling is about 200ppm, and the electrical conductivity is less than 0.0600; the oxygen content of the copper rods pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00
CPCB22D11/00
Inventor 李勇许方胡咏梅姜兴振郑碰菊杨新涛
Owner JIANGXI UNIV OF SCI & TECH
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