Method of production of scandium-containing addition alloys

FIELD: non-ferrous metallurgy; methods of production of scandium-containing ligatures.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy. The method of production of scandium-containing addition alloys includes a metallothermic restoration in halogenide melts. According to the invention the halogenide melt containing 1.0-1.4 mass % of scandium oxide is added with 1.4-1.7 mass % of zirconium oxide and conduct restoration by an alloy of aluminum with magnesium at the ratio of the halogenide melt to the aluminum-magnesium alloy from 1.2 up to 1.6. The technical result of the invention is production of a synthesized addition alloy containing scandium and zirconium with the maximal strengthening effect, decreased value of the produced addition alloy (by 30-40 %) due to decrease of consumption of the cost intensive scandium oxide by 50 %.

EFFECT: the invention ensures production of a synthesized scandium and zirconium ligature with maximal strength, allows to decrease significantly its production cost and consumption of expensive scandium oxide.

1 tbl, 1 ex

 

The invention relates to the field of metallurgy of non-ferrous metals, in particular to methods of producing aluminum alloys with rare metals. Alloying of aluminum alloys with scandium significantly increases the strength and ductility of the alloys.

The known method of direct alloying of aluminum and rare metals in an argon atmosphere (U.S. patent No. 3619181), the disadvantage of this method is the use of relatively expensive starting materials in the metallic form, great frenzy of rare metals during melting.

A known method of producing alloys with zirconium by restoring the chlorides of zirconium, magnesium (A.S. No. 382729). The disadvantage of this method is to be used as raw materials expensive chlorides of zirconium and conducting complex preliminary operations the introduction of sodium chloride zirconium bearing melt.

As the prototype is proposed a method of obtaining a scandium-containing ligatures, which is carried out metallothermic the recovery of oxides of scandium halide melts, while the restoration is subjected to the concentrate of scandium oxide and use as a reducing agent aluminium alloy with magnesium [RF patent "a method of obtaining a scandium-containing ligatures №2162112, IPC 22, publ. 20.01.2001].

The disadvantage of this method is that the process does not allow you to get word the ing the scandium-containing alloys and to reduce the consumption of expensive scandium oxide.

The objective of the invention is to obtain optimal scandium-containing ligatures, which allows to synthesize aluminum alloys with a maximum hardening effect, while saving 50% expensive scandium and increasing its positive effect.

The problem is solved due to the fact that the method of obtaining a scandium-containing ligatures includes receiving a charge of molten halides and oxides of scandium and recovery of aluminum-magnesium alloy according to the invention, the mixture containing 1.0 to 1.4 wt.% oxide of scandium, add 1.4 to 1.7 wt.% zirconium oxide and restoration is carried out at a ratio of halide to melt aluminum-magnesium alloy from 1.2 to 1.6.

The essence of the method consists in the following.

In most aluminum alloys magnesium is a major component. Joint alloying of aluminum alloy with scandium and zirconium strengthens the aluminum matrix due to the following: when the alloying alloys with scandium there is a high rate of coarsening of the secondary particles of Al3Sc when heated, with the introduction of Zirconia formed secondary particles of the phases of Al3(Sc1-x, Zrx), which is coagulated with a significantly lower rate than particles of Al3Sc, eventually they retain high dispersion and accordingly what about the ability to inhibit the recrystallization and to strengthen the aluminum matrix. When the joint recovery of oxides of scandium and zirconium alloy Al-Mg the latter plays the role of reducing agent, and aluminum - the role of the collector. The process of recovery of the compounds of scandium and zirconium occurs actively and at the same time. It should be noted that in the halide melt formed precursors - halide compounds of scandium and zirconium in the form of molten salts. Subsequent recovery of such melt synthesized intermetallic compounds of Al3(Scx, Zry) given composition that will provide a positive impact on their structure and properties obtained in consequence of alloys and semi-finished products. Furthermore, the addition of zirconium to the scandium saves expensive scandium and enhances its positive properties. Thus, to obtain aluminum alloys it is the best to use ligatures Al-Mg-Sc-Zr. This can be used cheap rough concentrate of scandium with a high content of zirconium oxide.

The choice of parameters is due to the following.

The content of scandium in the melt is less than 1.0 wt.% will not allow to receive a ligature of a given composition and process (modifying) the property will be violated. If the content of scandium in the melt more than 1.4 wt.% this will lead to excessive consuming component (scandium) and ligature cost becomes who I am disadvantageous.

The content of zirconium in the melt below 1.4 wt.% also not possible to synthesize the ligature with the specified content of zirconium and positive technological properties. When the concentration of zirconium in the melt more than 1.7 wt.% formed mainly of intermetallic compounds of a similar composition Al3Zr, which will not allow to achieve high-modifying properties ligatures.

When the ratio of halide to melt aluminum-magnesium alloy is less than 1.2, the recovery process is retarded and the transition of the alloying components in the final product decreases. In case of increase of this ratio above 1.6 produce large quantities of circulating salts, which reduces the performance of the equipment.

Example. The laboratory setup consists of a shaft furnace, sealed reactor and glass. As the reductant used aluminium alloy with 17-20 wt.% magnesium, the initial charge consists of halides of sodium, potassium, aluminum, and oxides of scandium and zirconium. Process temperature 900-1000°C. At the end of the process made the shutter speed. The obtained products were cooled and analyzed for the content items. The results are shown in the table.

The data obtained indicate the technical effect of the proposed method: the joint recovery of the oxides of zirconium and scandium provides is to reduce the consumption of expensive scandium 50%, to increase the degree of extraction of the alloying elements in the alloy and, ultimately, to improve modifying the combined effect of alloying elements.

A method of obtaining a scandium-containing ligatures, which includes the receipt of a charge of molten halides and oxides of scandium and recovery of aluminum-magnesium alloy, characterized in that the mixture containing 1.0 to 1.4 wt.% oxide of scandium, add 1.4 to 1.7 wt.% zirconium oxide and restoration is carried out at a ratio of halide to melt aluminum-magnesium alloy from 1.2 to 1.6.



 

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