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Aluminum-scandium alloy and preparation method thereof

A technology of alloy and aluminum-scandium, which is applied in the field of aluminum-scandium alloy and its preparation, can solve the problems of aluminum-scandium alloy structure, uneven composition, difficult control of the composition of aluminum-scandium master alloy, and influence on the aluminothermic reduction reaction, so as to achieve uniform composition and structure , Solve the effect of oxidation and burning of oxides and avoid the problem of uncontrollable thermal reduction reaction

Active Publication Date: 2019-10-08
CHINA ENFI ENGINEERING CORPORATION
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  • Application Information

AI Technical Summary

Problems solved by technology

The thermal reduction method includes: after mixing the molten salt according to a certain proportion, adding it to the molten pure aluminum melt, and then reducing reaction at a certain temperature to obtain an aluminum-scandium master alloy. Since the mixed molten salt powder is doped with a large amount of gas, Adding molten aluminum into the molten aluminum is very easy to cause oxidation and burning loss, resulting in a change in the composition of the mixed molten salt, affecting the next step of the aluminothermic reduction reaction, making it difficult to control the composition of the aluminum-scandium master alloy; some fluorinating agents are NH 4 HF 2 It is highly irritating and toxic, and long-term exposure will cause harm to the body and serious environmental pollution, so it is not conducive to industrial production; some use scandium fluoride and aluminum as raw materials to prepare aluminum scandium alloys by thermal reduction method, the disadvantage is the reduction reaction It needs to be carried out in a vacuum reactor, which requires a high temperature of 1100-1350 ° C, which significantly increases the production cost. In addition, the high vacuum and high temperature environment have high requirements for reduction equipment, and it is difficult to realize industrial application.
It can be seen that the current electrolytic method has complicated devices and high cost, and the aluminum-scandium alloy produced by the thermal reduction method faces the problem of uneven structure and composition.

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  • Aluminum-scandium alloy and preparation method thereof

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preparation example Construction

[0035] According to the method for preparing aluminum-scandium alloy in the embodiment of the present invention, the aluminum-scandium alloy is prepared by adopting the two-step method of molten salt preparation and thermal reduction reaction, which effectively solves the problem of oxidation and burning of oxides in the thermal reduction process, and significantly improves the scandium content. The utilization rate and actual recovery rate reduce the production cost. By drying the halides, mixing, heating, melting, heat preservation and then cooling to form a massive mixed molten salt, that is, the original powdery raw materials will be changed into uniformly mixed block raw materials and then added to the thermal reduction reaction, which is conducive to maintaining the thermal reduction reaction process. Stability of medium molten salt system. Moreover, adding supplementary mixed molten salt and scandium-containing compounds in stages during the entire thermal reduction pro...

Embodiment 1

[0039] (1) Dry the 50-mesh powdered halide molten salt at 110°C for 120 minutes, and then follow the NaF:KCl:NaCl:Na 3 AlF 6 = 1:1:2:5 ratio of ingredients, prepared 120g of powdered mixed molten salt, mixed evenly, put it into a crucible and heated to 850°C, melted and stirred, kept warm for 20min, poured into a container to cool, and obtained Block mixed molten salt;

[0040] (2) Weigh 200g of aluminum ingot, put it into a graphite crucible and heat it to 700°C for melting, then add 100g of block mixed molten salt therein, heat until the block of molten salt is completely melted, and start the reduction reaction at 900°C, and Weigh 5g of scandium-containing compound in 10min and add it to the melt, the Sc in the scandium-containing compound 2 o 3 : ScF 3 =3:0.5, the whole process is stirred once every 20min, each time stirring for 1min, and 10g block mixed molten salt is added every 15min, after the reduction reaction for 60min, the mixed molten salt solution after the u...

Embodiment 2

[0042] (1) Dry the 200-mesh powdered halide molten salt at 110°C for 120 minutes, and then follow the NaF:KCl:NaCl:Na 3 AlF 6 = 1:2:2:6 ratio of ingredients, prepared 350g of powdery mixed molten salt, mixed evenly, put it into a crucible and heated to 900°C, melted and stirred, kept warm for 30min, poured into a container to cool, and obtained Block mixed molten salt;

[0043] (2) Weigh 500g of aluminum ingot, put it into a graphite crucible and heat it to 700°C for melting, then add 300g of block mixed molten salt therein, heat until the block of molten salt is completely melted, and start the reduction reaction at 1000°C, and Weigh 10g of scandium-containing compound in 10min and add it into the melt, the Sc in the scandium-containing compound 2 o 3 : ScF 3 = 3:1, the whole process is stirred once every 20 minutes, each time stirring for 1 minute, and 20 g of block mixed molten salt is added every 15 minutes. After the reduction reaction for 30 minutes, the mixed molten...

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Abstract

The invention discloses an aluminum-scandium alloy and a preparation method thereof. The preparation method comprises the following steps that (1) halide is mixed after being dried, cooling is carriedout after the halide is heated, melted and preserved heat, so that blocky mixed molten salt is obtained; (2) after an aluminum ingot is heated and melted, the blocky mixed molten salt is added, and heating is continuously carried out until the molten salt is completely molten, then a scandium-containing compound is added in batches, and the blocky mixed molten salt is added and supplemented in batches so as to generate a reduction reaction to obtain the aluminum-scandium alloy. According to the method, the molten salt preparation and thermal reduction reaction are adopted to prepare the aluminum-scandium alloy, so that simpleness and rapid are achieved, the molten salt content can be adjusted, the scandium content is controllable, the aluminum-scandium alloy component is uniform in structure, the scandium content is stable, and the component segregation is small.

Description

technical field [0001] The invention belongs to the technical field of high-performance aluminum alloy materials, in particular, the invention relates to an aluminum-scandium alloy and a preparation method thereof. Background technique [0002] The addition of scandium to aluminum alloy can significantly refine the grain structure of the alloy and increase the recrystallization temperature, thereby improving the corrosion resistance, heat resistance, weldability and neutron radiation damage resistance of the aluminum alloy. Due to the excellent characteristics of light weight, high strength, good plasticity, high temperature resistance, corrosion resistance and good weldability, aluminum-scandium alloy can be widely used in aerospace, automobile, rail transit as an advanced high-performance lightweight structural material , military science and defense and other fields. [0003] At present, the preparation of aluminum-scandium alloy mainly includes pair mixing method, therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C21/00C22B5/04
CPCC22B5/04C22C1/00C22C21/00
Inventor 韩国强李诺杜尚超王玮玮付国燕刘召波孙宁磊姚心
Owner CHINA ENFI ENGINEERING CORPORATION
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