BG2943U1 - Aluminium foil alloy composition - Google Patents

Abstract

The utility model finds application in the field of metallurgy, and in particular in the non-ferrous metallurgy. The utility model, in the form of a thin sheet - a foil in a separate layer and/or covered with a paper or plastic layer, is intended for packaging, thermal insulation, shielding layer in electrical cables and others. The composition of the alloy for an aluminium foil, as an independent layer with a thickness of 8 ? 20 µm, has high strength and ductility, which are achieved by the quantitative ratios of the alloying elements silicon Si, iron Fe, copper Cu, manganese Mn, magnesium Mg, zinc Zn and titanium Ti, mechanical and heat treatment of the metal. 1 claim

Description

Field of technology

The utility model is used in the field of metallurgy and in particular in non-ferrous metallurgy.

The utility model, in the form of a thin sheet - foil in a separate layer and / or covered with a paper or plastic layer, is intended for packaging in the food industry and household, thermal insulation for industrial purposes, shielding layer in electrical cables and others.

BACKGROUND OF THE INVENTION

An alloy composition for aluminum strips [1] is known, which contains (in% by weight): silicon from 0.1 to 0.2, iron from 1.3 to 1.4, copper to 0.1, manganese from 0 , 5 to 0.6, magnesium up to 0.03, zinc up to 0.05, titanium up to 0.03, chromium 0.05, unavoidable concomitant impurities up to 0.15 and separately maximum 0.05, and the remaining amount up to 100 is aluminum. The alloy composition for aluminum strips is not suitable for rolling to aluminum foil with a thickness of 8> 20 pm.

Another composition of an alloy for aluminum profiles is known [2], which contains (in% by weight): silicon from 0.35 to 0.5, iron from 0.15 to 0.3, copper to 0.02, manganese up to 0.01, magnesium from 0.4 to 0.6, zinc up to 0.04, titanium up to 0.02, chromium 0.05, unavoidable concomitant impurities up to 0.15 and separately up to a maximum of 0.05, and the rest quantity up to 100 is aluminum. This alloy composition for aluminum profiles has a high hardness and is not suitable for rolling aluminum foil.

Also known in practice is an aluminum foil alloy composition which contains (in% by weight): silicon up to 0.4, iron from 1.2 to 2, copper up to 0.3, manganese from 0.3 to 1, magnesium up to 0.1, zinc up to 0.1, titanium up to 0.05, unavoidable accompanying impurities up to 0.15 and separately up to a maximum of 0.05, and the remaining amount up to 100 is aluminum. This aluminum foil alloy composition is brittle, not flexible and tough enough, and is therefore only suitable for rolling aluminum foil with intermediate recrystallization annealing.

Technical essence of the utility model

The task of the utility model is to create a composition of an alloy for aluminum foil, which is of high strength and high ductility and can be used in a separate layer with a thickness of 8> 20 pm.

The problem is solved with the composition of an alloy for aluminum foil, obtained by the quantitative ratios of alloying elements, mechanical and thermal processing of the metal.

The utility model alloy composition for aluminum foil contains alloying elements silicon Si, iron Fe, copper Si, manganese Mn, magnesium Mg, zinc Zn and titanium Ti in the following quantitative ratios (in wt.%): Silicon Si to 0.2, iron Fe from 1.45 to 1.6, copper Cu up to 0.03, manganese Mn from 0.32 to 0.42, magnesium Mg up to 0.03, zinc Zn up to 0.03, titanium Ti up to 0.03, as unavoidable concomitant impurities have a total maximum of 0.15 and separately a maximum of 0.05, and the remaining amount of up to 100 is aluminum A1.

After melting the mixture - a mixture of aluminum A1, aluminum waste - scrap and alloying elements and casting, a strip aluminum billet is obtained from an alloy composition for aluminum foil, which is heat treated by high temperature annealing. An aluminum foil with a thickness of 8> 20 pm is obtained by subsequent cold rolling of the strip aluminum blank.

An advantage of the utility model Alloy composition for aluminum foil is that at a thickness of 8> 20 pm it has high strength and ductility.

An advantage of the utility model is that the aluminum foil can be used as a stand-alone layer in the food industry and for household purposes, as well as in the composition of complexes with other materials.

Example of implementation of the utility model

The utility model is illustrated by the following example, which does not limit its use. Example 1.

The composition of the alloy for aluminum foil contains alloying elements silicon Si, iron Fe, copper Si, manganese Mn, magnesium Mg, zinc Zn and titanium Ti in the following quantitative ratios (in wt.%):

1923 Descriptions to certificates for registration of utility models № 06.2 / 29.06.2018 silicon Si up to 0.2, iron Fe from 1.45 to 1.6, copper Si up to 0.03, manganese Mp from 0.32 to 0.42 , magnesium Mg up to 0.03, zinc Zn up to 0.03, titanium Ti up to 0.03, with unavoidable concomitant impurities up to a maximum of 0.15 and separately up to 0.05, and the remaining amount up to 100 is aluminum A1.

The necessary physical and mechanical parameters of the alloy composition for aluminum foil are achieved through the quantitative ratios of the alloying elements, the mechanical and thermal processing of the metal.

The alloy composition for aluminum foil is obtained by continuous casting, as the temperature of the metal in the furnace reaches 780 ° C.

The furnace is loaded with a mixture - charge, which consists of aluminum A1, meeting the requirements of BDS EN 576 and BDS EN 573-3, scrap aluminum waste and alloying elements. The charge is prepared so that the alloying elements in the molten metal are in the required quantitative ratios.

After melting the charge, the liquid metal is treated for 15 minutes with a flux to remove gases and contaminants. The resulting slag is separated and the melt is subjected to chemical analysis. After comparing the result obtained with the required chemical composition, if necessary, add some of the alloying elements or aluminum A1. After reaching the required chemical composition, the melt is transferred to a holding furnace - mixer, in which the temperature is maintained in the range of 745 ^ 765 ° C. The liquid metal is sequentially discharged into a degassing box and a foam ceramic filter, where it is treated with an inert gas (argon) to release impurities of low density, hydrogen, alkali metals and other impurities. The metal is fed and distributed by means of a refractory supply nozzle - nozzle between water-cooled rollers - crystallizers in a casting machine. The metal crystallizes in the form of a continuous strip with transverse dimensions determined by the nozzle and the clearance between the rollers.

The resulting strip foil preform of aluminum foil alloy composition is heat treated by high temperature annealing. Aluminum foil with a thickness of 8- + 20 ppm is obtained by subsequent cold rolling of the strip aluminum blank.

Claims (1)

Claims Aluminum foil alloy composition comprising alloying elements silicon Si, iron Fe, copper Si, manganese Mn, magnesium Mg, zinc Zn and titanium Ti, characterized in that the elements are in the following quantitative ratios (in% by weight) ): silicon Si up to 0.2, iron Fe from 1.45 to 1.6, copper Si up to 0.03, manganese Mn from 0.32 to 0.42, magnesium Mg up to 0.03, zinc Zn up to 0, 03, titanium Ti to 0.03, and the remaining amount to 100 is aluminum A1.