JPS6141742A - High strength aluminum alloy foil and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture high purity Al alloy foil, by soaking, hot and cold rolling an alloy ingot composed of a specified quantity of Zr and the balance high purity Al, then degreasing said sheet by annealing at temp. of perfect recrystallization temp. or below. CONSTITUTION:The ingot obtd. by rapidly cooling at >=about 10 deg.C/sec rate, an Al alloy composed of 0.1-0.3wt% Zr, further if necessary, 0.05-0.2% V and the balance Al of >=99.0% purity with inevitable impurities, is soaked favorably at >=about 580 deg.C for >=about 5hr, then hot rolled at <=about 300 deg.C finishing temp. for a short time of <=about 5min. Next, hot rolled plate is cold rolled to refine crystal grains, then annealing degreasing is performed at temp. of perject recrystallization temp. or below in about 300-370 deg.C range, to obtain Al alloy foil superior in strength and suitable for various laminate foil and electric wire cover, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a high-strength aluminum alloy foil, for example, an aluminum alloy foil used as a laminate foil as a material for cap seals, FTP, etc., and a method for manufacturing the same. .

Conventional technology and problems Recently, as a material for various packaging such as food or medicine,
So-called An, which is made by laminating aluminum foil to synthetic resin material.
Laminated materials are increasingly being used, but in order to obtain high adhesion strength with the resin material, it is necessary to degrease the rolling oil on the surface of the foil to obtain high adhesion strength with the aluminum foil used for such materials. . The most commonly used degreasing method is generally a thermal method, ie, annealing at a temperature of approximately 350'C or higher, which also serves to soften the foil.

Conventionally, pure aluminum such as alloy 1 to 30, which has good rollability, has been mainly used as a material for aluminum foil for the above-mentioned applications, but since such alloys have a low complete recrystallization temperature, It has the disadvantage that it is completely recrystallized by degreasing treatment and becomes a so-called O material. For this reason, the crystal grains became coarse and sufficient strength could not be obtained, and it was not possible to reduce the thickness to reduce costs.

Furthermore, since the foil exhibits an excessively softened state, it also has the disadvantage that it tends to become misaligned due to stretching of the foil when printing is performed.

Therefore, in order to increase the strength of the foil, attempts were made to perform rapid annealing using continuous annealing to refine the crystal grains.
It was not as effective as expected. Moreover,
It is actually difficult to perform advanced annealing on thin foils having a thickness of about 35 μm or less.

Additionally, attempts have been made to increase strength by causing dispersion strengthening or solid solution hardening by adding Mn or MQ;
This has resulted in drawbacks such as increased rolling deformation resistance, resulting in poor rolling properties, and the formation of an oxide film, which impedes adhesion to the resin.

Means to Solve the Problems Therefore, the inventors conducted various experiments and research on the composition and manufacturing method of alloy foil, with the intention of improving the strength of the foil without incurring the above-mentioned drawbacks. As a result of repeated experiments, it was found that the complete recrystallization of the alloy increased by 11 degrees with the addition of Zr.

Based on this knowledge, we succeeded in improving the strength of the foil by maintaining the processed structure in the foil without completely recrystallizing it even through heat treatment for annealing. It is.

That is, one of the inventions is that Zr: 0.1 to 0°3wt
Including % or roughly V: 0.05~Q, 2wt%
Another invention relates to a method for manufacturing the alloy foil, with the balance being aluminum with a purity of 99.0% or more and unavoidable impurities. Contains 0.3wt%,
Al0 is an aluminum alloy ingot that roughly contains 0.05 to 0.2 wt% of V, and the remainder is pure [99.0% or more of aluminum and unavoidable impurities]. After homogenizing the aluminum alloy ingot, hot rolling, The gist of this invention is a method for producing a high-strength aluminum alloy foil, which is characterized by cold rolling and then annealing and degreasing at a temperature below the complete recrystallization temperature.

First, in the composition of the aluminum alloy foil, the base aluminum should have a purity of 99.0% or more. In this case, F e s as an unavoidable impurity
If S'+ is small, the softening temperature increases, but on the other hand, it causes a decrease in strength, so r! If J ISl 05
It is preferable to use 0 or J ISI 100 alloy.

Zr delays the recrystallization of the alloy and contributes to improving the heat resistance without inhibiting the rolling properties.
If Q is less than 3 wt %, the effect will be poor, and if Q exceeds 3 wt %, the melting point will rise and casting will become difficult.

(2) contributes to further improving the strength of the alloy without impairing the heat resistance effect of ZR.

However, if it is less than 0.02 wt%, the effect is poor, and if it exceeds 0.2 wt%, the melting point increases and casting becomes difficult.

Next, to explain the manufacturing method, in the general known manufacturing method, an aluminum alloy ingot produced by casting is sequentially subjected to homogenization treatment, hot rolling, cold rolling, and annealing and degreasing. In the invention, the condition is that the above-mentioned annealing and degreasing is performed at a temperature below the complete recrystallization temperature.

First, it is desirable to cast the alloy by cooling it as quickly as possible in order to form a solid solution of ZR, and preferably at a cooling rate of 10° C./8130° C. or higher.

The purpose of the homogenization treatment is to further dissolve Zr in solid solution,
This is because it is difficult to dissolve all Z' into solid solution in DC casting. This homogenization treatment is preferably carried out at a temperature of 580° C. or higher for 5 hours or more.

It is desirable that the hot rolling be carried out in as short a time as possible, within about 5 minutes, in order to prevent the precipitation of lr, and the final temperature is desirably 300'C or less. Cold rolling is also effective for refining the crystal grains of the final foil.

The reason why the annealing and degreasing is performed at a temperature below the complete recrystallization temperature is to maintain the strength by leaving the processed structure in the alloy foil, and when the recrystallization temperature is exceeded, the crystal grains become large. The skin becomes rough easily. However, if the temperature is too low, it will take a long time to degrease, so it is generally 300℃ to 37℃.
A range of 5°C is preferred. Note that leaving the processed structure to remain will impede the improvement of elongation, so the alloy foil of the present invention is preferably used for applications that do not undergo large forming processes, such as cap seals, PTP, or wire coatings. It is.

Effects of the Invention - As explained above, the aluminum alloy foil according to the present invention and the aluminum alloy foil manufactured by the present invention can cause a processed structure to remain in the foil due to an increase in the recrystallization temperature. As is clear from
It has superior strength to conventional alloy foils made from materials such as 1N30, and can be suitably used for various laminate foils, particularly for cap seals, PTP, and wire coatings. Therefore, the aluminum alloy foil used in these applications can be made even thinner than the conventional products, which helps reduce the cost of packaging materials.

Example Next, examples of the present invention will be shown in comparison with comparative examples.

[Margin below] Table 1 DC&I ingots of aluminum alloys with various compositions shown in Table 1 were homogenized at 610°C for 24 hours, then sequentially hot rolled and cold rolled to a thickness of 0. Make 1M foil,
Next, the final foil was obtained by annealing at 350° C. for 1 hour.

The complete recrystallization temperature, tensile strength, and 0.2% proof stress of each part were investigated. The results are shown in Table 2.

Table 2 From the above results, the aluminum alloy foil according to the present invention has a complete recrystallization temperature that is higher than that of the comparative product, and a tensile strength of 0.2%.
It was confirmed that the yield strength was significantly improved and the strength was excellent.

that's all

Claims (4)

[Claims] (1) A high-strength aluminum alloy foil containing Zr: 0.1 to 0.3 wt%, with the remainder consisting of aluminum with a purity of 99.0% or more and unavoidable impurities. (2) After homogenizing an aluminum alloy ingot containing Zr: 0.1 to 0.3 wt% and the remainder consisting of aluminum with a purity of 99.0% or higher and unavoidable impurities, hot rolling and cold rolling are performed. A method for producing a high-strength aluminum alloy foil, which is characterized by subjecting the foil to annealing and degreasing at a temperature below the complete recrystallization temperature. (3) Zr: 0.1-0.3wt%, V: 0.05-0
．． A high-strength aluminum alloy foil containing 2 wt% of aluminum with the balance being 99.0% or more pure and unavoidable impurities. (4) Zr: 0.1-0.3wt%, V: 0.05-0
．． After homogenizing an aluminum alloy ingot containing 2 wt% and the remainder consisting of aluminum with a purity of 99.0% or more and unavoidable impurities, hot rolling and cold rolling are performed, and then the temperature is below the complete recrystallization temperature. A method for producing high-strength aluminum alloy foil, which is characterized by annealing and degreasing.