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A heat treatment process of 8021 high-performance aluminum foil for flexible packaging

A high-performance, flexible packaging technology, applied in the field of aluminum alloy processing, can solve problems such as failure to meet the use requirements of aluminum foil for lithium batteries, failure to control the intermediate annealing process, and decline in mechanical properties of finished products, so as to improve the performance of flexible packaging, improve comprehensive processing performance, The effect of low production cost

Active Publication Date: 2017-12-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardness and high strength of the 8021 alloy, in the prior art, the intermediate annealing process and the precipitation of the second phase are generally not well controlled, so that the subsequent production is prone to coarse grains, fast hardening speed, and a decline in the mechanical properties of the finished product, especially The cupping value is generally lower than 6.0mm (20mm indenter), which cannot meet the use requirements of lithium battery aluminum foil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The 8021 aluminum alloy is produced according to the conventional process, and the "2+1" annealing method is adopted, that is, two intermediate anneals and one finished product anneal: when the thickness of the slab is 5.5mm, the first intermediate anneal is performed, and the annealing process is 500 ° C × 3h; when rolling to a thickness of 0.6mm, carry out the second intermediate annealing process, the annealing process is 450℃×5h; after the final rolling to 0.04mm, adopt the finished product annealing process at 260℃×40h. The final 8021 aluminum foil had a tensile strength of 101 MPa, an elongation of 16%, and a cupping value of 6.5 mm.

Embodiment 2

[0038] The 8021 aluminum alloy is produced according to the conventional process, and the "2+1" annealing method is adopted, that is, two intermediate anneals and one finished product anneal: when the thickness of the slab is 5.5mm, the first intermediate anneal is performed, and the annealing process is 510 ° C × 4h; when rolling to a thickness of 0.6mm, carry out the second intermediate annealing process, the annealing process is 460℃×6h; after the final rolling to 0.04mm, adopt the finished product annealing process at 250℃×41h. The final 8021 aluminum foil had a tensile strength of 102 MPa, an elongation of 18%, and a cupping value of 6.9 mm.

Embodiment 3

[0040] The 8021 aluminum alloy is produced according to the conventional process, and the "2+1" annealing method is adopted, that is, two intermediate anneals and one finished product anneal: when the thickness of the slab is 5.5mm, the first intermediate anneal is performed, and the annealing process is 520 ° C × 4h; when rolling to a thickness of 0.6mm, carry out the second intermediate annealing process, the annealing process is 460℃×7h; after the final rolling to 0.04mm, adopt the finished product annealing process at 260℃×45h. The final 8021 aluminum foil had a tensile strength of 106 MPa, an elongation of 23%, and a cupping value of 7.6 mm.

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Abstract

The invention relates to a heat treatment technology for 8021 high-performance aluminum foil for a soft package. Two times of intermediate annealing and final finished product annealing are conducted in a cold rolling stage in an existing 8021 aluminum foil production technology. By means of the heat treatment technology, on the basis of a traditional preparing technology, a '2+1' annealing manner is used for improving the performance of the 8021 aluminum foil for the soft package of a lithium battery; precipitation, growth and distribution of second phases are effectively controlled, so that multiple second phases and fine grain structures are obtained and are well matched in the aspects of strength and plasticity (the tensile strength ranges from 101 MPa to 110 MPa, and the elongation percentage ranges from 16% to 23%); and in addition, the cupping value is larger than or equal to 6.5 mm, and the requirement for the use performance of the soft package of the lithium ion battery can be met. The technology is simple in operation, relatively low in production cost and capable of improving alloy structures and obviously increasing the alloy elongation percentage and the cupping value; and meanwhile the produced aluminum foil has extremely-high isolation performance. The aluminum foil can be compounded with other materials, simultaneous stretching and flowing can be achieved, and in addition, the requirement for the scouring depth of composite film soft packages of food, medicines and even lithium ion batteries can be met.

Description

technical field [0001] The invention relates to the field of aluminum alloy processing, in particular to a heat treatment process of 8021 high-performance aluminum foil for flexible packaging. Background technique [0002] In recent years, the use of aluminum foil and the expansion of related technologies have become more and more extensive, and aluminum foil is becoming one of the materials that countries are paying close attention to. At present, China is in a stage of accelerated urbanization and industrialization. The national demand for aluminum foil has increased significantly, which has promoted the investment and construction of the aluminum foil industry. The aluminum foil industry has developed rapidly, and this rapid development momentum will continue. The consumption of aluminum foil The market is booming day by day. [0003] For aluminum and aluminum alloys, the thickness is equal to or less than 0.20mm, whether it is rolled or sheeted, it is called foil. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C22C21/00
CPCC22C21/00C22F1/04
Inventor 林高用魏玉勇周珂王洪洋王晶莉
Owner CENT SOUTH UNIV