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Method for purifying copper foil

A purification method and copper foil technology, applied in chemical instruments and methods, single crystal growth, polycrystalline material growth, etc., can solve the problems of high difficulty in preparation and high energy consumption

Active Publication Date: 2022-06-28
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a copper foil purification method, which can not only directly purify industrial polycrystalline rolled copper foil, but also improve the problems of high energy consumption and high preparation difficulty in existing purification methods, and at the same time make industrial polycrystalline copper foil single Crystallization to improve product performance

Method used

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  • Method for purifying copper foil

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preparation example Construction

[0046] In the actual preparation process, the inventors found that although the above-mentioned specific annealing temperature and time can effectively improve the purification effect, the final purified single crystal copper foil still has certain impurities and the phenomenon of surface roughness, and further research is carried out for this purpose. It is found that the reason for the rough surface is the influence of the mixed atmosphere on the one hand, and the detachable pipe plugs at both ends of the tube furnace, which can ensure that the temperature in the furnace cavity is as balanced as possible, thereby reducing the temperature in the furnace cavity to a certain extent. The temperature difference between the copper foil in the middle and the copper foil at both ends of the furnace cavity is different, but due to the high annealing temperature, the impurities in the tube plug will be vaporized and deposited on the surface of the final single crystal copper foil during...

Embodiment 1

[0057] Place high-purity graphite paper (impurity content 200ppm) on high-purity quartz plate (6N), and place polycrystalline copper foil with a thickness of 25 μm on high-purity graphite paper to obtain polycrystalline copper foil / high-purity graphite paper / high Pure Quartz Plate.

[0058] Put the polycrystalline copper foil / high-purity graphite paper / high-purity quartz plate into the central temperature zone of the tube furnace. No pipe plugs are added at both ends of the tube furnace, and argon and hydrogen are introduced into the tube furnace. In an atmosphere with an argon flow rate of 600 sccm and a hydrogen flow rate of 38 sccm, keep the temperature of the central temperature zone of the tube furnace at 1065 ℃ for 5 h. Cool to room temperature naturally.

Embodiment 2

[0060] Place high-purity graphite paper (impurity content 200ppm) on high-purity quartz plate (6N), and place polycrystalline copper foil with a thickness of 25 μm on high-purity graphite paper to obtain polycrystalline copper foil / high-purity graphite paper / high Pure Quartz Plate.

[0061] Put the polycrystalline copper foil / high-purity graphite paper / high-purity quartz plate into the central temperature zone of the tube furnace. No pipe plugs are added at both ends of the tube furnace, and argon and hydrogen are introduced into the tube furnace. In an atmosphere where the flow rate of argon gas is 600sccm and the flow rate of hydrogen gas is 30sccm, the temperature of the central temperature zone of the tube furnace is kept at 1050 ℃ for 5h. Cool to room temperature.

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Abstract

The invention discloses a copper foil purification method and belongs to the field of material purification. The purification method of the copper foil comprises the steps that an assembly is placed in a central temperature zone of a tubular furnace, annealing is conducted for at least 5 h under the mixed atmosphere of inert gas and hydrogen under the condition that the temperature of the central temperature zone is kept at 1050-1070 DEG C, purified single crystal copper foil is obtained, and the assembly is composed of polycrystalline copper foil containing impurities and a carrier supporting the polycrystalline copper foil. The polycrystalline copper foil is a rolled copper foil, the flow of the inert gas is 500-600 sccm, and the flow of the hydrogen is 30-100 sccm. According to the purification method, the industrial polycrystalline copper foil can be directly purified, the problems that an existing purification method is large in energy consumption and high in preparation difficulty are solved, meanwhile, the industrial polycrystalline copper foil can be subjected to single crystallization, and the product performance is improved.

Description

technical field [0001] The present application relates to the field of material purification, in particular, to a method for purifying copper foil. Background technique [0002] Due to the excellent physical and chemical properties of intrinsically pure metals, the pursuit of high-purity metals is an urgent need for the development of advanced precision electronic technology. Among them, high-purity copper has attractive electrical, thermal and mechanical properties, and has been widely used in modern communications, electronics, national defense and other industrial fields. Improving the purity of copper is an effective way to further improve the performance of metal products, such as from 4N at 10K. When purified to 7N, the electrical conductivity can be increased by nearly 100 times, and the area reduction rate of 6N after the ultra-high purity copper tensile test is 91%, which is higher than 82% of commercial copper. [0003] In general, to meet the demand for high-puri...

Claims

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Application Information

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IPC IPC(8): C30B27/00C30B29/02
CPCC30B27/00C30B29/02Y02E60/10
Inventor 刘开辉寇金宗张志强乐湘斌黄智何梦林王恩哥
Owner SONGSHAN LAKE MATERIALS LAB
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