A method for production of aluminum-scandium alloys

 

The invention relates to the metallurgy of rare metals, more specifically to the technology of aluminum alloys with rare-earth elements, scandium, yttrium and the lanthanides. The technical result is the production of more homogeneous ingots, stabilization and simplification of the process. A method for production of aluminum-scandium alloys includes the restoration of fluorine-containing scandium aluminum in the presence of chlorides and fluorides of potassium and sodium by heating under a layer of epithelial flux of chlorides of sodium and potassium. Before restoring the mixed granules of aluminum metal with a particle size of 2-7 mm geksaftortantalatom sodium and sodium fluoride taken in the ratio (weight): granules of aluminum: hexafloride sodium: sodium fluoride, equal(8,7-9,1):1: (1,2-1,8). The resulting mixture is placed in a crucible filled with molten mixture of sodium chloride and potassium chloride with the formation of a coating of a flux layer of 20-30 mm and restoration carried out by heating to a temperature of 700-750oWith subsequent exposure 60-90 min and the Department received ligatures. table 1.

The present invention relates to the field of metallurgy of rare metals, more specifically to the technology of aluminum alloys with redkozemelnaja with a rare earth metal, known more economical ways of producing such alloys based on the reactions of metallothermy, i.e. displacement of rare earth metal more active aluminum [1, 2, 3].

The main difficulties arise in carrying out the process, because it is necessary to provide averaging of the initial components and aluminum metal. Given the relatively low solubility of rare-earth metal aluminium, it presents certain difficulties. To lower the process temperature in the system enter chlorides or fluorides of sodium and potassium [2]. Scandium is introduced into the process in the form of oxide or fluoride, scandium [4].

The closest technical solution and the achieved result is a technical solution described in the patent [5]. The ligature receiving, downloading the scandium-containing mixture under a layer of flux in the molten aluminum at a temperature of 840-850oC. scandium-containing mixture comprises scandium fluoride, sodium fluoride and potassium chloride.

The disadvantage of this technical solution is to obtain a heterogeneous ligatures, because it is difficult to provide a uniform distribution of scandium in the entire mass of the ingot. In addition, the filling inside the molten aluminum is hard ass decision.

The technical result is a homogeneous ingots, stabilization and simplification of the process.

This technical result is achieved by a method for production of aluminum-scandium alloys, including the recovery of fluorine compounds scandium aluminum in the presence of chlorides and fluorides of potassium and sodium by heating under a layer of epithelial flux of chlorides of sodium and potassium, according to the invention, before you can restore mix granules of aluminum metal with a particle size of 2-7 mm geksaftortantalatom sodium and sodium fluoride taken in the ratio (weight. ): granules of aluminum: hexafloride sodium: sodium fluoride, equal(8,7-9,1): 1:(1,2-1,8), the resulting mixture is placed in a crucible filled with molten mixture of sodium chloride and potassium chloride with the formation of a coating of a flux layer of 20-30 mm, and the restoration carried out by heating to a temperature of 700-750oWith subsequent exposure 60-90 min and the Department received ligatures.

Example 1 In a graphite crucible was loaded granules of aluminum metal with particle size, hexafloride sodium and sodium fluoride in quantities specified in the table. The mixture is pre-mixed. In the crucible poured molten mixture of chloride natm. The crucibles were placed in the muffle and probalily 1 hour at a temperature of 720oC. the Results are presented in the table.

The degree of heterogeneity of the ingot ligatures defined as the ratio of the concentration of scandium in the lower part of the ingot to the concentration at the top: q=CH/St. If you use pellets of aluminium 1 mm or less, the reduced extraction due to partial oxidation of scandium oxygen of the oxide film of aluminum. Larger pieces lead to an increase in the degree of heterogeneity. When reducing the number of hexaferrite sodium (op.6), the degree of heterogeneity increases due to the lack of scandium, necessary for the formation of intermetallic Al3SC. If you do not comply with the requirements to the height of the top layer, it is possible penetration of oxygen and oxidation of scandium at a temperature of calcination. Hexafloride sodium has an advantage over scandium fluoride, as the latter melts at high temperatures. When restoring using hexaferrite sodium scandium is oxidized to a lesser extent. A positive effect is to obtain a more homogeneous ingots, stabilization and simplification of the process.

Sources of information 1. Sandler, R. A. and other Magnetoresistance aluminum-zirconium alloys. AC USSR 254090 from 07.10.69, With 22 1/02.

3. Kovalevsky, A. V. and other Method of obtaining aluminium alloy with rare earth metals. AC USSR 511360 from 30.04.74, With 22 1/06.

4. Shubin A. B. and other Way of retrieving ligature scandium-aluminum. RF patent 2124574, With 22 1/03.

5. The Moskvitin Century. And. , Mach, S. C. and other Way of retrieving ligature aluminium-scandium. AC 1580826 from 11.12.87, With 22 1/06.

Claims

A method for production of aluminum-scandium alloys, including the recovery of fluorine compounds scandium aluminum in the presence of chlorides and fluorides of potassium and sodium by heating under the top layer of the flux of their chlorides of sodium and potassium, characterized in that before restoring the mixed granules of aluminum metal with a particle size of 2-7 mm geksaftortantalatom sodium and sodium fluoride taken in the ratio, wt.%: granules of aluminum : hexafloride sodium : sodium fluoride, equal 8,7-9,1:1:1,2-1,8, the resulting mixture is placed in a crucible filled with molten mixture of sodium chloride and potassium chloride with the formation of a coating of a flux layer of 20-30 mm and restoration carried out by heating to a temperature of 700-750With subsequent exposure 60-90 min and the Department received ligatures.

 

Same patents:

The invention relates to ferrous metallurgy, in particular the production of alloys based on magnesium, and their processing

The invention relates to alloys based on magnesium, in particular to the composition of magnesium alloys and methods for their preparation, which find wide application in automotive industry

The invention relates to metallurgy, aeronautical engineering, namely to obtain high purity corrosion-resistant alloys based on magnesium

The invention relates to metallurgy, aeronautical engineering, namely to obtain high purity corrosion-resistant alloys based on magnesium

The invention relates to ferrous metallurgy and can be used in the preparation of alloys of non-ferrous metals, in particular magnesium and zirconium

The invention relates to metallurgy, aircraft, namely the production of high-purity corrosion-resistant alloys based on magnesium

The invention relates to the field of mechanical engineering and aircraft that can be applied to magnesium alloys as a light high-tech construction material in the manufacture of thin-walled articles of complex configuration
The invention relates to ferrous metallurgy, and in particular to methods of preparation of magnesium and its alloys in open furnaces

The invention relates to ferrous metallurgy and can be used in the manufacture of blanking disc wheels, aluminum deformable, thermally hardening alloys

The invention relates to the field of metallurgy and can be used in industrial production of high quality ingots containing refractory components, including for the manufacture of superconductors
The invention relates to the technology of laser synthesis of bulk products machine parts using selective laser sintering

Composite material // 2216602
The invention relates to powder metallurgy, in particular to obtain a composite material that can be used, for example, in semiconductor devices

Composite material // 2216602
The invention relates to powder metallurgy, in particular to obtain a composite material that can be used, for example, in semiconductor devices
The invention relates to ferrous metallurgy, in particular to technology for preparation of aluminum kremnezemsoderzhashchego alloys

The invention relates to ferrous metallurgy, in particular the production of alloys based on magnesium, and their processing

The invention relates to alloys based on magnesium, in particular to the composition of magnesium alloys and methods for their preparation, which find wide application in automotive industry

The invention relates to the field of metallurgy of non-ferrous metals and can be used for the production of aluminum-scandium alloys used for modification of aluminum alloys

The invention relates to the field of structural materials and engineering chemistry, in particular to cellular-frame material with an open-porous structure and the method of its production

The invention relates to the hydrometallurgical processing of ore concentrates, and more particularly to the processing of loparite concentrate and can be used in complex extraction of compounds of titanium, niobium and tantalum
Up!